--- a/NEWS	Thu Sep 03 16:38:12 2026 +0200
+++ b/NEWS	Fri Sep 04 15:26:17 2026 +0200
@@ -5,13 +5,20 @@
 => Minimum SDK version: 1.7.0 <=
 
 * Support for annotations
+* Persistence of annotations in the Orthanc database (SDK 1.12.8 is required)
+
+Configuration
+-------------
+
 * New configuration option "EnableAnnotations" to enable annotations
 * New configuration option "AuthenticationSource" to enable per-user annotations:
   - "None" uses the administrative Orthanc user (default)
   - "RegisteredUsers" relies on the HTTP basic authentication that is built in Orthanc
   - "HttpHeader" takes the user out of the HTTP header specified in "AuthenticationHttpHeader" option
   - "Plugin" can be used if the "orthanc-education" plugin is installed
-* Persistence of annotations in the Orthanc database (SDK 1.12.8 is required)
+* New configuration option "Instructors" to distinguish between learners
+  and instructors, only if the authentication source is "HttpHeader"
+* New configuration option "EnableAnnotationsSharing" to enable sharing of annotations
 
 Maintenance
 -----------

--- a/ViewerPlugin/Annotations/IAuthenticatedUser.cpp	Thu Sep 03 16:38:12 2026 +0200
+++ b/ViewerPlugin/Annotations/IAuthenticatedUser.cpp	Fri Sep 04 15:26:17 2026 +0200
@@ -262,20 +262,13 @@
         {
           return new GuestUser;
         }
+        else if (ViewerConfiguration::GetInstance().IsInstructor(user))
+        {
+          return new GenericStandardUser(ProjectRole_Instructor, user);
+        }
         else
         {
-#if 0   // TODO - TEST
-          if (user == "learner@uclouvain.be")
-          {
-            return new GenericStandardUser(ProjectRole_Learner, request->headersValues[i]);
-          }
-          else
-          {
-            return new GenericStandardUser(ProjectRole_Instructor, request->headersValues[i]);
-          }
-#else
-          return new GenericStandardUser(ProjectRole_Instructor, request->headersValues[i]);
-#endif
+          return new GenericStandardUser(ProjectRole_Learner, user);
         }
       }
     }

--- a/ViewerPlugin/ViewerConfiguration.cpp	Thu Sep 03 16:38:12 2026 +0200
+++ b/ViewerPlugin/ViewerConfiguration.cpp	Fri Sep 04 15:26:17 2026 +0200
@@ -58,6 +58,11 @@
         }
 
         Orthanc::Toolbox::ToLowerCase(authenticationHttpHeader_);
+
+        if (!wsiConfiguration_.LookupSetOfStrings(instructors_, "Instructors", false))
+        {
+          instructors_.clear();
+        }
       }
       else if (value == "RegisteredUsers")
       {
@@ -212,4 +217,17 @@
   {
     return wsiConfiguration_.GetBooleanValue("EnableAnnotationsSharing", false);
   }
+
+
+  bool ViewerConfiguration::IsInstructor(const std::string& username) const
+  {
+    if (username.empty())
+    {
+      return false;
+    }
+    else
+    {
+      return instructors_.find(username) != instructors_.end();
+    }
+  }
 }

--- a/ViewerPlugin/ViewerConfiguration.h	Thu Sep 03 16:38:12 2026 +0200
+++ b/ViewerPlugin/ViewerConfiguration.h	Fri Sep 04 15:26:17 2026 +0200
@@ -52,6 +52,7 @@
     OrthancPlugins::OrthancConfiguration wsiConfiguration_;
     AuthenticationSource                 authenticationSource_;
     std::string                          authenticationHttpHeader_;
+    std::set<std::string>                instructors_;
 
     ViewerConfiguration();
 
@@ -84,5 +85,7 @@
     unsigned int GetFeaturesCacheSize() const;
 
     bool IsAnnotationsSharingEnabled() const;
+
+    bool IsInstructor(const std::string& username) const;
   };
 }