diff --git a/README.md b/README.md
index 9b9907f4c510a533c8c3c06eb432c123d9827f5a..6173d8b887407fa8e7d36644138fbe1fac0ee3e5 100644
--- a/README.md
+++ b/README.md
@@ -83,13 +83,8 @@ Note that this local server will only work inside Docker.
 
 ### User groups
 
-One group has a special meaning in Arkindex: The `Internal` group, for special users whose tokens are used by workers. This groups is configured using the `INTERNAL_GROUP_ID` setting. The development server will show warnings but let you start the server anyway if the group isn't there; you will be able to access the Django admin and create the group from there. To create them using the shell:
-
-```
-backend/arkindex$ ./manage.py shell
->>> from django.contrib.auth.models import Group
->>> Group.objects.create(id=2, name='Internal')
-```
+We use a custom group model in `arkindex.users.models` (not the `django.contrib.auth` one).
+In this early version groups do not define any right yet.
 
 ## Usage
 
diff --git a/arkindex/documents/fixtures/data.json b/arkindex/documents/fixtures/data.json
index 43e9debed534a5920a0c161adca0b0c8e538e6e2..5d3b2c8d4323f8be8d684d14d8fab650fdc4f265 100644
--- a/arkindex/documents/fixtures/data.json
+++ b/arkindex/documents/fixtures/data.json
@@ -1,115 +1,115 @@
 [
 {
     "model": "dataimport.repository",
-    "pk": "1e022c37-4a8e-4624-8fbe-6c8a4d5b22a2",
+    "pk": "5e396627-e235-40d5-b726-fe108be8fb1b",
     "fields": {
-        "url": "http://gitlab/repo",
-        "type": "iiif",
-        "hook_token": "hook-token",
-        "credentials": "b07d0cb3-65b7-45c4-9bf2-d7153f4d27cd",
+        "url": "http://my_repo.fake/workers/worker",
+        "type": "worker",
+        "hook_token": "worker-hook-token",
+        "credentials": "5665e36b-ae6c-4830-84ab-c283e363c1c5",
         "provider_name": "GitLabProvider"
     }
 },
 {
     "model": "dataimport.repository",
-    "pk": "b6e463c3-0631-425f-8702-da7f32166b21",
+    "pk": "cdb5b204-1a2a-4cd2-be2f-18987a524946",
     "fields": {
-        "url": "http://my_repo.fake/workers/worker",
-        "type": "worker",
-        "hook_token": "worker-hook-token",
-        "credentials": "b07d0cb3-65b7-45c4-9bf2-d7153f4d27cd",
+        "url": "http://gitlab/repo",
+        "type": "iiif",
+        "hook_token": "hook-token",
+        "credentials": "5665e36b-ae6c-4830-84ab-c283e363c1c5",
         "provider_name": "GitLabProvider"
     }
 },
 {
     "model": "dataimport.revision",
-    "pk": "bc9f203f-e870-4f79-96ce-4c0f3211691e",
+    "pk": "0f0342f5-de30-435e-82e1-ae49f8ba7531",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "repo": "b6e463c3-0631-425f-8702-da7f32166b21",
-        "hash": "1337",
-        "message": "My w0rk3r",
-        "author": "Test user"
+        "repo": "cdb5b204-1a2a-4cd2-be2f-18987a524946",
+        "hash": "42",
+        "message": "a",
+        "author": "me"
     }
 },
 {
     "model": "dataimport.revision",
-    "pk": "f353f467-9fb4-4f78-b962-03a8cd10cd85",
+    "pk": "8a3312dd-2bd3-4945-b698-18665e4067ee",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "repo": "1e022c37-4a8e-4624-8fbe-6c8a4d5b22a2",
-        "hash": "42",
-        "message": "a",
-        "author": "me"
+        "repo": "5e396627-e235-40d5-b726-fe108be8fb1b",
+        "hash": "1337",
+        "message": "My w0rk3r",
+        "author": "Test user"
     }
 },
 {
     "model": "dataimport.worker",
-    "pk": "72cd3c6b-be61-439e-ac00-da0440a6dfab",
+    "pk": "594c0947-bc77-4789-885f-d25c3f3002d6",
     "fields": {
         "name": "Recognizer",
         "slug": "reco",
         "type": "recognizer",
-        "repository": "b6e463c3-0631-425f-8702-da7f32166b21"
+        "repository": "5e396627-e235-40d5-b726-fe108be8fb1b"
     }
 },
 {
     "model": "dataimport.worker",
-    "pk": "dd3e3126-f07d-47d5-80cc-f9439aca0ad0",
+    "pk": "77a92b42-6ef7-4f64-a13f-91aa428c027f",
     "fields": {
         "name": "Document layout analyser",
         "slug": "dla",
         "type": "dla",
-        "repository": "b6e463c3-0631-425f-8702-da7f32166b21"
+        "repository": "5e396627-e235-40d5-b726-fe108be8fb1b"
     }
 },
 {
     "model": "dataimport.workerversion",
-    "pk": "060456c0-c109-4f05-b78d-4dbe13995d05",
+    "pk": "6d9e758b-fc18-4c14-b0bc-94a15163625e",
     "fields": {
-        "worker": "72cd3c6b-be61-439e-ac00-da0440a6dfab",
-        "revision": "bc9f203f-e870-4f79-96ce-4c0f3211691e",
+        "worker": "594c0947-bc77-4789-885f-d25c3f3002d6",
+        "revision": "8a3312dd-2bd3-4945-b698-18665e4067ee",
         "configuration": {
             "test": 42
         },
         "state": "available",
-        "docker_image": "2f4c9981-6ee0-43a1-80f0-54cca23be3ff",
+        "docker_image": "462af040-499c-4b7b-85d1-25d2d1b349e8",
         "docker_image_iid": null
     }
 },
 {
     "model": "dataimport.workerversion",
-    "pk": "67be8557-e683-43c5-b9d7-1b57b4516e09",
+    "pk": "b0aa5214-ac0f-48b8-800a-e8a66545e0fd",
     "fields": {
-        "worker": "dd3e3126-f07d-47d5-80cc-f9439aca0ad0",
-        "revision": "bc9f203f-e870-4f79-96ce-4c0f3211691e",
+        "worker": "77a92b42-6ef7-4f64-a13f-91aa428c027f",
+        "revision": "8a3312dd-2bd3-4945-b698-18665e4067ee",
         "configuration": {
             "test": 42
         },
         "state": "available",
-        "docker_image": "2f4c9981-6ee0-43a1-80f0-54cca23be3ff",
+        "docker_image": "462af040-499c-4b7b-85d1-25d2d1b349e8",
         "docker_image_iid": null
     }
 },
 {
     "model": "documents.corpus",
-    "pk": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+    "pk": "0549780c-bce1-445e-8f07-7e32889fe71e",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "name": "Unit Tests",
         "description": "",
-        "repository": "1e022c37-4a8e-4624-8fbe-6c8a4d5b22a2",
+        "repository": "cdb5b204-1a2a-4cd2-be2f-18987a524946",
         "public": true
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "1e98cd23-9b0b-44ed-84b5-3a9e4dec68b3",
+    "pk": "3536ef92-ad56-4b63-b243-d71afc4fdded",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "volume",
         "display_name": "Volume",
         "folder": true,
@@ -118,9 +118,9 @@
 },
 {
     "model": "documents.elementtype",
-    "pk": "6acab4ca-a475-485e-b9cf-fc8a8404bcd1",
+    "pk": "419898d9-287c-48fb-9fce-22dc237bec14",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "word",
         "display_name": "Word",
         "folder": false,
@@ -129,9 +129,9 @@
 },
 {
     "model": "documents.elementtype",
-    "pk": "6bc2cbbd-b98e-4689-bf9d-8a9095710632",
+    "pk": "433202e9-f8c1-4f76-9b65-7fff323798b2",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "act",
         "display_name": "Act",
         "folder": false,
@@ -140,9 +140,9 @@
 },
 {
     "model": "documents.elementtype",
-    "pk": "77739a6b-f044-4a5e-9c19-bc881caafbbf",
+    "pk": "611f5a3e-1137-4984-b27c-a07d3c7ff728",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "text_line",
         "display_name": "Line",
         "folder": false,
@@ -151,9 +151,9 @@
 },
 {
     "model": "documents.elementtype",
-    "pk": "8ccc9061-0bc7-4d74-8a83-d427273a8c56",
+    "pk": "68ac563f-b627-4f16-b941-f3a136a0ed26",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "page",
         "display_name": "Page",
         "folder": false,
@@ -162,9 +162,9 @@
 },
 {
     "model": "documents.elementtype",
-    "pk": "f56fb6dd-afe4-49b3-a870-963467404935",
+    "pk": "bff5642d-b6a9-4856-bc8f-1c01cb58c0b0",
     "fields": {
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "slug": "surface",
         "display_name": "Surface",
         "folder": false,
@@ -173,508 +173,508 @@
 },
 {
     "model": "documents.elementpath",
-    "pk": "06d9848e-c2cd-4f1b-9d07-00ed04f69b9e",
+    "pk": "1010dfe8-1285-44d7-9c2e-f1e5f212b218",
     "fields": {
-        "element": "bbd63fcc-23af-4593-bcb5-341c3008b7ab",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"35fb048c-f441-4e9d-bb69-78a8dfdb4598\"]",
-        "ordering": 2
+        "element": "19dfd0e1-1517-4674-8d28-0b0d402afce6",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\"]",
+        "ordering": 4
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "07d8a649-9b5c-4338-9e42-20a3fc9c884e",
+    "pk": "1a10ea74-7d77-497f-8ecb-7cfb71711a8d",
     "fields": {
-        "element": "35fb048c-f441-4e9d-bb69-78a8dfdb4598",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\"]",
+        "element": "550014fa-b5b4-46ee-b70d-7c00bb913ac7",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\"]",
         "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "0abd85c5-7d97-49ca-9b60-b67e7e7d215e",
+    "pk": "1f1affd5-6ea3-4200-9b17-cdbce7ea367d",
     "fields": {
-        "element": "7945d738-4a6e-4a76-ad57-21c03d63625d",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\"]",
-        "ordering": 2
+        "element": "ed7a03cb-199f-4b54-b659-9567703cd361",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"ad7283c3-6643-49e2-a966-2e5c55cf4638\"]",
+        "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "1aefc8c1-1dba-4f8e-b2eb-b7b7c5bc0b01",
+    "pk": "235ba787-53d5-460a-94ec-6de1db578d4b",
     "fields": {
-        "element": "7e788454-afed-4bef-a370-bccf0dd3b2b4",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\"]",
+        "element": "c0007432-82e1-4420-8075-173af982ba6f",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"4ad6a90c-f4ba-48e5-91ce-14d3bd3c6ba3\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "1f1a82a0-7835-465b-ae6d-d6db65e92696",
+    "pk": "29424414-5fbf-480e-b61b-1e2a109f8bf2",
     "fields": {
-        "element": "ebdb0c60-e1e4-4f8a-a8b7-4127896ac194",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\"]",
-        "ordering": 1
+        "element": "69a25981-0e8e-4cf3-93a0-9a5c17030f4f",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"e6b3aed3-c443-4df2-98c2-f7da41eaceec\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "2f8c2139-9b01-415c-8a80-b708a7fd841d",
+    "pk": "2faf7133-54c1-46fd-b4f0-3498984d4a1a",
     "fields": {
-        "element": "326843be-0112-4954-a2ea-da78aded01a9",
-        "path": "[\"07422db5-10c5-404b-9325-db2689871761\"]",
-        "ordering": 0
+        "element": "c7295c75-b855-4b70-9475-a00e7ef9a572",
+        "path": "[\"3df1ce74-6f2d-473d-bd0d-b20bf6b913ef\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "4beb2166-9bc1-462f-bbbb-34cb43ceeb8a",
+    "pk": "31640292-df9c-4101-b4c0-1179e6152a4d",
     "fields": {
-        "element": "b9f39256-6ff0-4daf-b56a-a5a316964133",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"35fb048c-f441-4e9d-bb69-78a8dfdb4598\"]",
+        "element": "9433969b-792e-44bf-93ad-db17c6bcd3de",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"19dfd0e1-1517-4674-8d28-0b0d402afce6\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "4e98abb3-e74c-4532-a831-11b41c00f2d5",
+    "pk": "4a36de70-76b4-4671-819f-39f7a881a661",
     "fields": {
-        "element": "96893993-5b8d-4ed0-b305-08f745d8df01",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"35fb048c-f441-4e9d-bb69-78a8dfdb4598\"]",
-        "ordering": 1
+        "element": "28ce8c14-2514-4fd5-bd6f-bd7fb668e36a",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"bee8c02b-98f6-4185-9897-762b62f73b3b\"]",
+        "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "4ed309a6-3af4-4fe4-975d-0a25ecd48bcf",
+    "pk": "5275e23b-de55-4fc4-8d5f-b3a07d803aa4",
     "fields": {
-        "element": "c4ccff42-93d3-4f66-a073-397dd85e1806",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\"]",
-        "ordering": 4
+        "element": "816b5708-411d-4763-b03b-66ef5a3531d6",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"84013d64-a85b-47c7-b734-722de1ae0d4b\"]",
+        "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "5980b951-7bcc-4213-a73b-e71659e8a8e1",
+    "pk": "60a579da-f473-4519-ac0a-4ca681be33d5",
     "fields": {
-        "element": "5130da8e-f2aa-477d-bf58-a2357efc8b2b",
-        "path": "[\"07422db5-10c5-404b-9325-db2689871761\"]",
-        "ordering": 2
+        "element": "de4cd51c-3f98-4b97-92c7-fd8b7c15feea",
+        "path": "[\"3df1ce74-6f2d-473d-bd0d-b20bf6b913ef\"]",
+        "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "7680a018-4523-4abc-8242-132958dd7f5a",
+    "pk": "6176fe99-ca33-4fa3-aaa9-2af038475466",
     "fields": {
-        "element": "fcf303df-36a5-40f2-997f-82eb47541bcf",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"99de88f1-9655-4bae-9203-01d56d097ef7\"]",
-        "ordering": 1
+        "element": "bee8c02b-98f6-4185-9897-762b62f73b3b",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "7de05621-65f2-4dcb-8f44-9a88fdfb3a22",
+    "pk": "6a8148b3-f9d3-4179-bd61-4e368c7afdb5",
     "fields": {
-        "element": "cbafeb68-d66a-4e1c-bcd4-47dd88b02eec",
-        "path": "[\"07422db5-10c5-404b-9325-db2689871761\"]",
-        "ordering": 1
+        "element": "4721e07a-2d53-4066-85a5-1c3a99e0840a",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"4ad6a90c-f4ba-48e5-91ce-14d3bd3c6ba3\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "a3e6f951-64da-474b-bd61-d323ad71d5c9",
+    "pk": "76ee2d3a-7509-4cb4-ad96-ed4ea18a174e",
     "fields": {
-        "element": "9f81a475-ed1f-470d-b11a-9740d6bb24d2",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"99de88f1-9655-4bae-9203-01d56d097ef7\"]",
+        "element": "ef787c30-b839-43f3-8a5e-cc87498cffd1",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"facee923-af23-4d71-8882-b20d621a66fd\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "a7ad8b75-e9fd-44f9-acec-a283b90d9585",
+    "pk": "814eb8ab-4cef-4fd0-8fe7-8265529bc5c7",
     "fields": {
-        "element": "73b56c40-4136-499b-9c10-82c2f569c78b",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"99de88f1-9655-4bae-9203-01d56d097ef7\"]",
-        "ordering": 0
+        "element": "c143d67e-aed5-4404-aa76-f47605dbf919",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"550014fa-b5b4-46ee-b70d-7c00bb913ac7\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "a9aec95c-fa0f-4b0d-b3ab-7e061481b7bb",
+    "pk": "8313a9af-2c02-42c8-869e-d9de2ccaa420",
     "fields": {
-        "element": "1fcb137d-12aa-47ea-8d94-fffd821cc3da",
-        "path": "[\"e001d1ee-fa90-4f96-b722-e2ba20b84097\", \"b675ba10-f6ed-45cb-8a8c-449940471db5\"]",
-        "ordering": 0
+        "element": "f7921f4f-be7b-4e41-9c27-37447d9f622c",
+        "path": "[\"afe50fbe-eb97-4366-8e18-1713aa711f4a\", \"550014fa-b5b4-46ee-b70d-7c00bb913ac7\"]",
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@@ -682,147 +682,147 @@
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@@ -833,7 +833,7 @@
 },
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@@ -844,11 +844,11 @@
 },
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@@ -856,23 +856,23 @@
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@@ -880,59 +880,59 @@
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@@ -1004,9 +1004,9 @@
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+        "image": "7ec02e33-b678-42ad-bde7-78b94bf4c2bb",
+        "polygon": "LINEARRING (100 100, 100 200, 200 200, 200 100, 100 100)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "a236763a-6d34-4c41-a1e5-a5e19d115d50",
+    "pk": "8ef76685-65b7-435b-b6eb-c80ca6d8710a",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "75371cf1-e321-47ec-bbc3-16c7c3d8f89a",
-        "polygon": "LINEARRING (0 0, 0 300, 300 300, 300 0, 0 0)"
+        "image": "7ec02e33-b678-42ad-bde7-78b94bf4c2bb",
+        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "aefbd01b-3421-458f-a8e6-2b5ffdaccc31",
+    "pk": "a26f7e91-a516-4598-a6d2-d43286fcf6b7",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "5f870efa-b012-4344-92ac-e5226c4cd26b",
-        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
+        "image": "7ec02e33-b678-42ad-bde7-78b94bf4c2bb",
+        "polygon": "LINEARRING (600 600, 600 1000, 1000 1000, 1000 600, 600 600)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "b70d7b27-c973-44ba-93c5-602957ae491e",
+    "pk": "ac959187-0ff5-4c87-ae5b-ee47f1656b96",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "75371cf1-e321-47ec-bbc3-16c7c3d8f89a",
-        "polygon": "LINEARRING (600 600, 600 1000, 1000 1000, 1000 600, 600 600)"
+        "image": "deac5fac-5c34-4f53-8afa-23f8a2ff313a",
+        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "bea07b51-a5bd-400a-b5d0-b0320dc77bd1",
+    "pk": "b6c3f8c5-5b3d-4c6c-8e2c-6a4383bc0349",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "68474756-161a-4199-96e1-e79dc216a8a0",
-        "polygon": "LINEARRING (700 700, 700 800, 800 800, 800 700, 700 700)"
+        "image": "cba07163-4df3-4320-94fc-6d4291df610c",
+        "polygon": "LINEARRING (0 0, 0 600, 600 600, 600 0, 0 0)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "c12fb064-b0df-4d8a-af13-55b2e9862e8d",
+    "pk": "dd1e7d88-a7bd-4444-8643-b99360267c42",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "68474756-161a-4199-96e1-e79dc216a8a0",
-        "polygon": "LINEARRING (100 100, 100 200, 200 200, 200 100, 100 100)"
+        "image": "cba07163-4df3-4320-94fc-6d4291df610c",
+        "polygon": "LINEARRING (600 600, 600 1000, 1000 1000, 1000 600, 600 600)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "db138d8c-b5fc-46e6-8dc6-483a1ffc8bf6",
+    "pk": "e2fc38e5-f313-4b51-a364-3705a3875dfe",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "68474756-161a-4199-96e1-e79dc216a8a0",
-        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
+        "image": "081d902d-2008-4b06-b2c4-7acf0c9b2980",
+        "polygon": "LINEARRING (100 100, 100 200, 200 200, 200 100, 100 100)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "f96e2027-4568-4527-a469-bcf27f4fcbb2",
+    "pk": "e93d0bc9-bdd7-442f-aeee-e2454c6cf833",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "8f7f17ff-9555-488f-acac-9cb6814e46a8",
-        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
+        "image": "cba07163-4df3-4320-94fc-6d4291df610c",
+        "polygon": "LINEARRING (700 700, 700 800, 800 800, 800 700, 700 700)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "fb6dff0f-e117-48f0-b27a-9fa65f42a055",
+    "pk": "ecd9f9aa-ce91-4969-99a7-63e9dcbd8ca6",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "8f7f17ff-9555-488f-acac-9cb6814e46a8",
-        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
+        "image": "7ec02e33-b678-42ad-bde7-78b94bf4c2bb",
+        "polygon": "LINEARRING (700 700, 700 800, 800 800, 800 700, 700 700)"
     }
 },
 {
     "model": "users.user",
     "pk": 1,
     "fields": {
-        "password": "pbkdf2_sha256$216000$nxRE2ciWpZ7g$92fj1x7D47uAXNxwfbkSX8ffAeO03T28riqjHM5yJVk=",
+        "password": "pbkdf2_sha256$216000$9CLrlNBjYsHu$l7PPc5KJivmcUJU2nNR4kH44tc7EeAE170B3PCSBCI4=",
         "last_login": null,
         "email": "root@root.fr",
         "transkribus_email": null,
         "is_active": true,
         "is_internal": false,
         "is_admin": true,
-        "verified_email": true,
-        "groups": []
+        "verified_email": true
     }
 },
 {
     "model": "users.user",
     "pk": 2,
     "fields": {
-        "password": "pbkdf2_sha256$216000$QEkgVJ40KttJ$98o0rhKrYu1vFJZ/+rOKk/D+oi52z6XGYIayxGO6P4I=",
+        "password": "pbkdf2_sha256$216000$r3zA0HxJh8He$JHSYUpAezr7yJUsmmsZxX2S5F/qZy/iuHDoQWPkqTlQ=",
         "last_login": null,
         "email": "internal@internal.fr",
         "transkribus_email": null,
         "is_active": true,
         "is_internal": true,
         "is_admin": false,
-        "verified_email": true,
-        "groups": []
+        "verified_email": true
     }
 },
 {
     "model": "users.user",
     "pk": 3,
     "fields": {
-        "password": "pbkdf2_sha256$216000$mWYa0QHsUxjL$z8BQ0LObKxjCWFE29wIKXyRuL+rEtgWyGuboxc5DL1Q=",
+        "password": "pbkdf2_sha256$216000$HfrDffda4FCv$SEsBuKudVFpFNdyAYELIY+o/jRr8CwlfY9XaLkcX9UI=",
         "last_login": null,
         "email": "user@user.fr",
         "transkribus_email": null,
         "is_active": true,
         "is_internal": false,
         "is_admin": false,
-        "verified_email": true,
-        "groups": []
+        "verified_email": true
     }
 },
 {
     "model": "users.oauthcredentials",
-    "pk": "b07d0cb3-65b7-45c4-9bf2-d7153f4d27cd",
+    "pk": "5665e36b-ae6c-4830-84ab-c283e363c1c5",
     "fields": {
         "user": 3,
         "provider_name": "gitlab",
@@ -1496,7 +1493,7 @@
     "pk": 1,
     "fields": {
         "user": 3,
-        "corpus": "78d45b37-36d1-4576-8bb2-8e5844f31feb",
+        "corpus": "0549780c-bce1-445e-8f07-7e32889fe71e",
         "can_write": true,
         "can_admin": true
     }
@@ -2765,329 +2762,401 @@
     "model": "auth.permission",
     "pk": 141,
     "fields": {
-        "name": "Can add data file",
+        "name": "Can add group",
         "content_type": 36,
-        "codename": "add_datafile"
+        "codename": "add_group"
     }
 },
 {
     "model": "auth.permission",
     "pk": 142,
     "fields": {
-        "name": "Can change data file",
+        "name": "Can change group",
         "content_type": 36,
-        "codename": "change_datafile"
+        "codename": "change_group"
     }
 },
 {
     "model": "auth.permission",
     "pk": 143,
     "fields": {
-        "name": "Can delete data file",
+        "name": "Can delete group",
         "content_type": 36,
-        "codename": "delete_datafile"
+        "codename": "delete_group"
     }
 },
 {
     "model": "auth.permission",
     "pk": 144,
     "fields": {
-        "name": "Can view data file",
+        "name": "Can view group",
         "content_type": 36,
-        "codename": "view_datafile"
+        "codename": "view_group"
     }
 },
 {
     "model": "auth.permission",
     "pk": 145,
     "fields": {
-        "name": "Can add data import",
+        "name": "Can add membership",
         "content_type": 37,
-        "codename": "add_dataimport"
+        "codename": "add_membership"
     }
 },
 {
     "model": "auth.permission",
     "pk": 146,
     "fields": {
-        "name": "Can change data import",
+        "name": "Can change membership",
         "content_type": 37,
-        "codename": "change_dataimport"
+        "codename": "change_membership"
     }
 },
 {
     "model": "auth.permission",
     "pk": 147,
     "fields": {
-        "name": "Can delete data import",
+        "name": "Can delete membership",
         "content_type": 37,
-        "codename": "delete_dataimport"
+        "codename": "delete_membership"
     }
 },
 {
     "model": "auth.permission",
     "pk": 148,
     "fields": {
-        "name": "Can view data import",
+        "name": "Can view membership",
         "content_type": 37,
-        "codename": "view_dataimport"
+        "codename": "view_membership"
     }
 },
 {
     "model": "auth.permission",
     "pk": 149,
     "fields": {
-        "name": "Can add repository",
+        "name": "Can add data file",
         "content_type": 38,
-        "codename": "add_repository"
+        "codename": "add_datafile"
     }
 },
 {
     "model": "auth.permission",
     "pk": 150,
     "fields": {
-        "name": "Can change repository",
+        "name": "Can change data file",
         "content_type": 38,
-        "codename": "change_repository"
+        "codename": "change_datafile"
     }
 },
 {
     "model": "auth.permission",
     "pk": 151,
     "fields": {
-        "name": "Can delete repository",
+        "name": "Can delete data file",
         "content_type": 38,
-        "codename": "delete_repository"
+        "codename": "delete_datafile"
     }
 },
 {
     "model": "auth.permission",
     "pk": 152,
     "fields": {
-        "name": "Can view repository",
+        "name": "Can view data file",
         "content_type": 38,
-        "codename": "view_repository"
+        "codename": "view_datafile"
     }
 },
 {
     "model": "auth.permission",
     "pk": 153,
     "fields": {
-        "name": "Can add revision",
+        "name": "Can add data import",
         "content_type": 39,
-        "codename": "add_revision"
+        "codename": "add_dataimport"
     }
 },
 {
     "model": "auth.permission",
     "pk": 154,
     "fields": {
-        "name": "Can change revision",
+        "name": "Can change data import",
         "content_type": 39,
-        "codename": "change_revision"
+        "codename": "change_dataimport"
     }
 },
 {
     "model": "auth.permission",
     "pk": 155,
     "fields": {
-        "name": "Can delete revision",
+        "name": "Can delete data import",
         "content_type": 39,
-        "codename": "delete_revision"
+        "codename": "delete_dataimport"
     }
 },
 {
     "model": "auth.permission",
     "pk": 156,
     "fields": {
-        "name": "Can view revision",
+        "name": "Can view data import",
         "content_type": 39,
-        "codename": "view_revision"
+        "codename": "view_dataimport"
     }
 },
 {
     "model": "auth.permission",
     "pk": 157,
     "fields": {
-        "name": "Can add worker",
+        "name": "Can add repository",
         "content_type": 40,
-        "codename": "add_worker"
+        "codename": "add_repository"
     }
 },
 {
     "model": "auth.permission",
     "pk": 158,
     "fields": {
-        "name": "Can change worker",
+        "name": "Can change repository",
         "content_type": 40,
-        "codename": "change_worker"
+        "codename": "change_repository"
     }
 },
 {
     "model": "auth.permission",
     "pk": 159,
     "fields": {
-        "name": "Can delete worker",
+        "name": "Can delete repository",
         "content_type": 40,
-        "codename": "delete_worker"
+        "codename": "delete_repository"
     }
 },
 {
     "model": "auth.permission",
     "pk": 160,
     "fields": {
-        "name": "Can view worker",
+        "name": "Can view repository",
         "content_type": 40,
-        "codename": "view_worker"
+        "codename": "view_repository"
     }
 },
 {
     "model": "auth.permission",
     "pk": 161,
     "fields": {
-        "name": "Can add worker version",
+        "name": "Can add revision",
         "content_type": 41,
-        "codename": "add_workerversion"
+        "codename": "add_revision"
     }
 },
 {
     "model": "auth.permission",
     "pk": 162,
     "fields": {
-        "name": "Can change worker version",
+        "name": "Can change revision",
         "content_type": 41,
-        "codename": "change_workerversion"
+        "codename": "change_revision"
     }
 },
 {
     "model": "auth.permission",
     "pk": 163,
     "fields": {
-        "name": "Can delete worker version",
+        "name": "Can delete revision",
         "content_type": 41,
-        "codename": "delete_workerversion"
+        "codename": "delete_revision"
     }
 },
 {
     "model": "auth.permission",
     "pk": 164,
     "fields": {
-        "name": "Can view worker version",
+        "name": "Can view revision",
         "content_type": 41,
-        "codename": "view_workerversion"
+        "codename": "view_revision"
     }
 },
 {
     "model": "auth.permission",
     "pk": 165,
     "fields": {
-        "name": "Can add git ref",
+        "name": "Can add worker",
         "content_type": 42,
-        "codename": "add_gitref"
+        "codename": "add_worker"
     }
 },
 {
     "model": "auth.permission",
     "pk": 166,
     "fields": {
-        "name": "Can change git ref",
+        "name": "Can change worker",
         "content_type": 42,
-        "codename": "change_gitref"
+        "codename": "change_worker"
     }
 },
 {
     "model": "auth.permission",
     "pk": 167,
     "fields": {
-        "name": "Can delete git ref",
+        "name": "Can delete worker",
         "content_type": 42,
-        "codename": "delete_gitref"
+        "codename": "delete_worker"
     }
 },
 {
     "model": "auth.permission",
     "pk": 168,
     "fields": {
-        "name": "Can view git ref",
+        "name": "Can view worker",
         "content_type": 42,
-        "codename": "view_gitref"
+        "codename": "view_worker"
     }
 },
 {
     "model": "auth.permission",
     "pk": 169,
     "fields": {
-        "name": "Can add worker run",
+        "name": "Can add worker version",
         "content_type": 43,
-        "codename": "add_workerrun"
+        "codename": "add_workerversion"
     }
 },
 {
     "model": "auth.permission",
     "pk": 170,
     "fields": {
-        "name": "Can change worker run",
+        "name": "Can change worker version",
         "content_type": 43,
-        "codename": "change_workerrun"
+        "codename": "change_workerversion"
     }
 },
 {
     "model": "auth.permission",
     "pk": 171,
     "fields": {
-        "name": "Can delete worker run",
+        "name": "Can delete worker version",
         "content_type": 43,
-        "codename": "delete_workerrun"
+        "codename": "delete_workerversion"
     }
 },
 {
     "model": "auth.permission",
     "pk": 172,
     "fields": {
-        "name": "Can view worker run",
+        "name": "Can view worker version",
         "content_type": 43,
-        "codename": "view_workerrun"
+        "codename": "view_workerversion"
     }
 },
 {
     "model": "auth.permission",
     "pk": 173,
     "fields": {
-        "name": "Can add data import element",
+        "name": "Can add git ref",
         "content_type": 44,
-        "codename": "add_dataimportelement"
+        "codename": "add_gitref"
     }
 },
 {
     "model": "auth.permission",
     "pk": 174,
     "fields": {
-        "name": "Can change data import element",
+        "name": "Can change git ref",
         "content_type": 44,
-        "codename": "change_dataimportelement"
+        "codename": "change_gitref"
     }
 },
 {
     "model": "auth.permission",
     "pk": 175,
     "fields": {
-        "name": "Can delete data import element",
+        "name": "Can delete git ref",
         "content_type": 44,
-        "codename": "delete_dataimportelement"
+        "codename": "delete_gitref"
     }
 },
 {
     "model": "auth.permission",
     "pk": 176,
     "fields": {
-        "name": "Can view data import element",
+        "name": "Can view git ref",
         "content_type": 44,
+        "codename": "view_gitref"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 177,
+    "fields": {
+        "name": "Can add worker run",
+        "content_type": 45,
+        "codename": "add_workerrun"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 178,
+    "fields": {
+        "name": "Can change worker run",
+        "content_type": 45,
+        "codename": "change_workerrun"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 179,
+    "fields": {
+        "name": "Can delete worker run",
+        "content_type": 45,
+        "codename": "delete_workerrun"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 180,
+    "fields": {
+        "name": "Can view worker run",
+        "content_type": 45,
+        "codename": "view_workerrun"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 181,
+    "fields": {
+        "name": "Can add data import element",
+        "content_type": 46,
+        "codename": "add_dataimportelement"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 182,
+    "fields": {
+        "name": "Can change data import element",
+        "content_type": 46,
+        "codename": "change_dataimportelement"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 183,
+    "fields": {
+        "name": "Can delete data import element",
+        "content_type": 46,
+        "codename": "delete_dataimportelement"
+    }
+},
+{
+    "model": "auth.permission",
+    "pk": 184,
+    "fields": {
+        "name": "Can view data import element",
+        "content_type": 46,
         "codename": "view_dataimportelement"
     }
 },
 {
     "model": "ponos.workflow",
-    "pk": "1fb1e3f8-67e4-45dd-acc8-1bdedf4e6f98",
+    "pk": "c7d0fc3f-2189-494e-a124-a5179e09fe8d",
     "fields": {
         "recipe": "tasks:\n docker_build:\n  image: reco",
         "created": "2020-02-02T01:23:45.678Z",
@@ -3096,7 +3165,7 @@
 },
 {
     "model": "ponos.task",
-    "pk": "a9d5d4ce-188e-4659-9f35-4de56a3e3e1d",
+    "pk": "4511527d-e7fb-45f1-be81-2727e81eb148",
     "fields": {
         "run": 0,
         "depth": 0,
@@ -3109,7 +3178,7 @@
         "has_docker_socket": false,
         "image_artifact": null,
         "agent": null,
-        "workflow": "1fb1e3f8-67e4-45dd-acc8-1bdedf4e6f98",
+        "workflow": "c7d0fc3f-2189-494e-a124-a5179e09fe8d",
         "container": null,
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -3118,9 +3187,9 @@
 },
 {
     "model": "ponos.artifact",
-    "pk": "2f4c9981-6ee0-43a1-80f0-54cca23be3ff",
+    "pk": "462af040-499c-4b7b-85d1-25d2d1b349e8",
     "fields": {
-        "task": "a9d5d4ce-188e-4659-9f35-4de56a3e3e1d",
+        "task": "4511527d-e7fb-45f1-be81-2727e81eb148",
         "path": "/path/to/docker_build",
         "size": 42000,
         "content_type": "application/octet-stream",
diff --git a/arkindex/users/admin.py b/arkindex/users/admin.py
index 0b240e09f57f794fb960ce29dd2f947860bfa1af..6e7a706b28ae56cf04f078d3e2d9324a32a37d71 100644
--- a/arkindex/users/admin.py
+++ b/arkindex/users/admin.py
@@ -2,10 +2,10 @@ from django import forms
 from django.contrib import admin
 from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
 from django.contrib.auth.forms import ReadOnlyPasswordHashField
-from django.contrib.auth.models import Group
+from django.contrib.auth.models import Group as BaseGroup
 from enumfields.admin import EnumFieldListFilter
 
-from arkindex.users.models import CorpusRight, User, UserScope
+from arkindex.users.models import CorpusRight, Group, User, UserScope
 
 
 class UserCreationForm(forms.ModelForm):
@@ -90,8 +90,18 @@ class UserScopeAdmin(admin.ModelAdmin):
     list_filter = [('scope', EnumFieldListFilter), ]
 
 
-# Now register the new UserAdmin...
+class MembershipInline(admin.TabularInline):
+    model = Group.users.through
+
+
+class GroupAdmin(admin.ModelAdmin):
+    list_display = ('id', 'name', 'public')
+    inlines = (MembershipInline, )
+
+
 admin.site.register(User, UserAdmin)
-# and hide the unused Group admin
-admin.site.unregister(Group)
+# Register the custom GroupAdmin
+admin.site.register(Group, GroupAdmin)
+# and hide base GroupAdmin form contrib.auth
+admin.site.unregister(BaseGroup)
 admin.site.register(UserScope, UserScopeAdmin)
diff --git a/arkindex/users/migrations/0006_update_group_and_membership.py b/arkindex/users/migrations/0006_update_group_and_membership.py
new file mode 100644
index 0000000000000000000000000000000000000000..32e19fc087f1f1f69cfaf1e9245eb32ce4c5cefc
--- /dev/null
+++ b/arkindex/users/migrations/0006_update_group_and_membership.py
@@ -0,0 +1,43 @@
+# Generated by Django 3.1.3 on 2020-11-16 14:40
+
+import uuid
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0005_user_transkribus_email'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Group',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=64)),
+                ('public', models.BooleanField(default=False)),
+            ],
+        ),
+        migrations.RemoveField(
+            model_name='user',
+            name='groups',
+        ),
+        migrations.CreateModel(
+            name='Membership',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('level', models.PositiveIntegerField(default=0, help_text='User privilege level.')),
+                ('group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='memberships', to='users.group')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='memberships', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='group',
+            name='users',
+            field=models.ManyToManyField(related_name='groups', through='users.Membership', to=settings.AUTH_USER_MODEL),
+        ),
+    ]
diff --git a/arkindex/users/models.py b/arkindex/users/models.py
index dd01d6d03c35ddd3584bc881a6f934985fbd16d9..f7d9fcb5d9364ac292b5e95da5d4e1b35e1e0c43 100644
--- a/arkindex/users/models.py
+++ b/arkindex/users/models.py
@@ -1,6 +1,6 @@
 import uuid
 
-from django.contrib.auth.models import AbstractBaseUser, Group
+from django.contrib.auth.models import AbstractBaseUser
 from django.db import models
 from enumfields import Enum, EnumField
 
@@ -24,12 +24,6 @@ class User(AbstractBaseUser):
     is_admin = models.BooleanField(default=False)
     verified_email = models.BooleanField(default=False)
 
-    groups = models.ManyToManyField(
-        Group,
-        blank=True,
-        related_name="users",
-    )
-
     corpus = models.ManyToManyField('documents.Corpus', through='users.CorpusRight')
 
     selected_elements = models.ManyToManyField(
@@ -74,6 +68,24 @@ class User(AbstractBaseUser):
         return self.is_admin
 
 
+class Group(models.Model):
+    id = models.UUIDField(default=uuid.uuid4, primary_key=True, editable=False)
+    name = models.CharField(max_length=64)
+    public = models.BooleanField(default=False)
+
+    users = models.ManyToManyField(
+        User,
+        through='Membership',
+        related_name='groups',
+    )
+
+
+class Membership(models.Model):
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='memberships')
+    group = models.ForeignKey(Group, on_delete=models.CASCADE, related_name='memberships')
+    level = models.PositiveIntegerField(default=0, help_text='User privilege level.')
+
+
 class OAuthStatus(Enum):
     Created = 'created'
     Done = 'done'