diff --git a/packages/models-library/src/models_library/api_schemas_webserver/licensed_items.py b/packages/models-library/src/models_library/api_schemas_webserver/licensed_items.py
index 0bc1e8b4738..45e7e20c1a7 100644
--- a/packages/models-library/src/models_library/api_schemas_webserver/licensed_items.py
+++ b/packages/models-library/src/models_library/api_schemas_webserver/licensed_items.py
@@ -56,7 +56,7 @@ class _ItisVipRestData(OutputSchema):
     description: str
     thumbnail: str
     features: FeaturesDict  # NOTE: here there is a bit of coupling with domain model
-    doi: str
+    doi: str | None
 
 
 class _ItisVipResourceRestData(OutputSchema):
@@ -92,13 +92,14 @@ def _update_json_schema_extra(schema: JsonDict) -> None:
                             {
                                 "categoryId": "HumanWholeBody",
                                 "categoryDisplay": "Humans",
-                                "source": VIP_DETAILS_EXAMPLE,
+                                "source": {**VIP_DETAILS_EXAMPLE, "doi": doi},
                             },
                         ),
                         "pricingPlanId": "15",
                         "createdAt": "2024-12-12 09:59:26.422140",
                         "modifiedAt": "2024-12-12 09:59:26.422140",
                     }
+                    for doi in ["10.1000/xyz123", None]
                 ]
             }
         )
diff --git a/packages/models-library/src/models_library/licenses.py b/packages/models-library/src/models_library/licenses.py
index 8f0cc84fed5..fd89e6b8621 100644
--- a/packages/models-library/src/models_library/licenses.py
+++ b/packages/models-library/src/models_library/licenses.py
@@ -110,7 +110,14 @@ def _update_json_schema_extra(schema: JsonDict) -> None:
                         "display_name": "my best model",
                         "licensed_resource_name": "best-model",
                         "licensed_resource_type": f"{LicensedResourceType.VIP_MODEL}",
-                        "licensed_resource_data": cast(JsonDict, VIP_DETAILS_EXAMPLE),
+                        "licensed_resource_data": cast(
+                            JsonDict,
+                            {
+                                "category_id": "HumanWholeBody",
+                                "category_display": "Humans",
+                                "source": VIP_DETAILS_EXAMPLE,
+                            },
+                        ),
                         "pricing_plan_id": "15",
                         "created_at": "2024-12-12 09:59:26.422140",
                         "modified_at": "2024-12-12 09:59:26.422140",
diff --git a/packages/models-library/tests/test_licenses.py b/packages/models-library/tests/test_licenses.py
new file mode 100644
index 00000000000..c5eaae26ff4
--- /dev/null
+++ b/packages/models-library/tests/test_licenses.py
@@ -0,0 +1,20 @@
+from models_library.api_schemas_webserver.licensed_items import LicensedItemRestGet
+from models_library.licenses import LicensedItem
+
+
+def test_licensed_item_from_domain_model():
+    for example in LicensedItem.model_json_schema()["examples"]:
+        item = LicensedItem.model_validate(example)
+
+        payload = LicensedItemRestGet.from_domain_model(item)
+
+        assert item.display_name == payload.display_name
+
+        # nullable doi
+        assert (
+            payload.licensed_resource_data.source.doi
+            == item.licensed_resource_data["source"]["doi"]
+        )
+
+        # date is required
+        assert payload.licensed_resource_data.source.features["date"]
diff --git a/services/web/server/src/simcore_service_webserver/api/v0/openapi.yaml b/services/web/server/src/simcore_service_webserver/api/v0/openapi.yaml
index 6caffd946b6..8ed4bd58b1f 100644
--- a/services/web/server/src/simcore_service_webserver/api/v0/openapi.yaml
+++ b/services/web/server/src/simcore_service_webserver/api/v0/openapi.yaml
@@ -15542,7 +15542,9 @@ components:
         features:
           $ref: '#/components/schemas/FeaturesDict'
         doi:
-          type: string
+          anyOf:
+          - type: string
+          - type: 'null'
           title: Doi
       type: object
       required: