diff --git a/server/vbv_lernwelt/competence/models.py b/server/vbv_lernwelt/competence/models.py
index f9779974..81abb841 100644
--- a/server/vbv_lernwelt/competence/models.py
+++ b/server/vbv_lernwelt/competence/models.py
@@ -6,10 +6,16 @@ from wagtail.fields import StreamField
 from wagtail.models import Page
 
 from vbv_lernwelt.core.model_utils import find_available_slug
-from vbv_lernwelt.core.serializer_helpers import get_it_serializer_class
+from vbv_lernwelt.course.models import CourseBasePage
 
 
-class CompetenceProfilePage(Page):
+class CompetenceProfilePage(CourseBasePage):
+    serialize_field_names = [
+        "course",
+        "circles",
+        "children",
+    ]
+
     parent_page_types = ["course.CoursePage"]
     subpage_types = ["competence.CompetencePage"]
 
@@ -26,19 +32,13 @@ class CompetenceProfilePage(Page):
     def get_frontend_url(self):
         return f"/competence/{self.slug}"
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            [
-                "course",
-                "circles",
-                "children",
-            ],
-        )
 
+class CompetencePage(CourseBasePage):
+    serialize_field_names = [
+        "competence_id",
+        "children",
+    ]
 
-class CompetencePage(Page):
     parent_page_types = ["competence.CompetenceProfilePage"]
     subpage_types = ["competence.PerformanceCriteria"]
     competence_id = models.TextField(default="A1")
@@ -63,18 +63,8 @@ class CompetencePage(Page):
         )
         super(CompetencePage, self).full_clean(*args, **kwargs)
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            [
-                "competence_id",
-                "children",
-            ],
-        )
 
-
-class PerformanceCriteria(Page):
+class PerformanceCriteria(CourseBasePage):
     parent_page_types = ["competence.CompetenceProfilePage"]
     competence_id = models.TextField(default="A1.1")
     learning_unit = models.ForeignKey(
diff --git a/server/vbv_lernwelt/competence/serializers.py b/server/vbv_lernwelt/competence/serializers.py
index 062009bf..a50eb387 100644
--- a/server/vbv_lernwelt/competence/serializers.py
+++ b/server/vbv_lernwelt/competence/serializers.py
@@ -1,19 +1,16 @@
 from rest_framework import serializers
 
 from vbv_lernwelt.competence.models import PerformanceCriteria
-from vbv_lernwelt.core.serializer_helpers import get_it_serializer_class
-from vbv_lernwelt.course.serializers import CourseCategorySerializer
+from vbv_lernwelt.course.serializers import (
+    CourseCategorySerializer,
+)
+from vbv_lernwelt.course.serializer_helpers import get_course_serializer_class
 
 
 class PerformanceCriteriaSerializer(
-    get_it_serializer_class(
+    get_course_serializer_class(
         PerformanceCriteria,
-        [
-            "id",
-            "title",
-            "slug",
-            "type",
-            "translation_key",
+        field_names=[
             "competence_id",
             "learning_unit",
             "circle",
@@ -43,14 +40,9 @@ class PerformanceCriteriaSerializer(
 
 
 class PerformanceCriteriaLearningPathSerializer(
-    get_it_serializer_class(
+    get_course_serializer_class(
         PerformanceCriteria,
-        [
-            "id",
-            "title",
-            "slug",
-            "type",
-            "translation_key",
+        field_names=[
             "competence_id",
         ],
     )
diff --git a/server/vbv_lernwelt/core/serializer_helpers.py b/server/vbv_lernwelt/core/serializer_helpers.py
index b1d1ef61..2f643c5c 100644
--- a/server/vbv_lernwelt/core/serializer_helpers.py
+++ b/server/vbv_lernwelt/core/serializer_helpers.py
@@ -1,41 +1,46 @@
 import wagtail.api.v2.serializers as wagtail_serializers
 from rest_framework.fields import SerializerMethodField
 
-from vbv_lernwelt.course.models import CoursePage
-from vbv_lernwelt.course.serializers import CourseCategorySerializer, CourseSerializer
 from vbv_lernwelt.learnpath.utils import get_wagtail_type
 
 
-def get_it_serializer_class(model, field_names):
-    base_field_names = [
-        "id",
-        "title",
-        "slug",
-        "type",
-        "translation_key",
-        "frontend_url",
-    ]
+def get_it_serializer_class(
+    model, field_names=None, base_field_names=None, base_class=None
+):
+    if field_names is None:
+        field_names = []
+
+    if base_field_names is None:
+        base_field_names = [
+            "id",
+            "title",
+            "slug",
+            "type",
+            "translation_key",
+            "frontend_url",
+        ]
+
+    if base_class is None:
+        base_class = ItWagtailBaseSerializer
+
     return wagtail_serializers.get_serializer_class(
         model,
         field_names=base_field_names + field_names,
         meta_fields=[],
-        base=ItBaseSerializer,
+        base=base_class,
     )
 
 
-class ItTypeField(wagtail_serializers.TypeField):
+class ItWagtailTypeField(wagtail_serializers.TypeField):
     def to_representation(self, obj):
         name = get_wagtail_type(obj)
         return name
 
 
-class ItBaseSerializer(wagtail_serializers.BaseSerializer):
-    type = ItTypeField(read_only=True)
+class ItWagtailBaseSerializer(wagtail_serializers.BaseSerializer):
+    type = ItWagtailTypeField(read_only=True)
     children = SerializerMethodField()
-    course = SerializerMethodField()
-    course_category = CourseCategorySerializer(read_only=True)
     frontend_url = SerializerMethodField()
-    circles = SerializerMethodField()
 
     meta_fields = []
 
@@ -54,36 +59,6 @@ class ItBaseSerializer(wagtail_serializers.BaseSerializer):
             for c in children
         ]
 
-    def get_course(self, obj):
-        if hasattr(obj, "course"):
-            return CourseSerializer(obj.course).data
-        else:
-            course_parent_page = obj.get_ancestors().exact_type(CoursePage).last()
-            if course_parent_page:
-                return CourseSerializer(course_parent_page.specific.course).data
-        return ""
-
-    def get_circles(self, obj):
-        course_parent_page = obj.get_ancestors().exact_type(CoursePage).last()
-
-        if course_parent_page:
-            from vbv_lernwelt.learnpath.models import Circle, LearningPath
-
-            circles = (
-                course_parent_page.get_children()
-                .exact_type(LearningPath)
-                .first()
-                .get_children()
-                .exact_type(Circle)
-            )
-
-            return [
-                {"id": c.id, "title": c.title, "translation_key": c.translation_key}
-                for c in circles
-            ]
-
-        return []
-
     def get_frontend_url(self, obj):
         if hasattr(obj, "get_frontend_url"):
             return obj.get_frontend_url()
diff --git a/server/vbv_lernwelt/course/models.py b/server/vbv_lernwelt/course/models.py
index 9095a0ad..daffc51e 100644
--- a/server/vbv_lernwelt/course/models.py
+++ b/server/vbv_lernwelt/course/models.py
@@ -6,6 +6,7 @@ from wagtail.models import Page
 
 from vbv_lernwelt.core.model_utils import find_available_slug
 from vbv_lernwelt.core.models import User
+from vbv_lernwelt.course.serializer_helpers import get_course_serializer_class
 
 
 class Course(models.Model):
@@ -31,7 +32,60 @@ class CourseCategory(models.Model):
         return f"{self.course} / {self.title}"
 
 
-class CoursePage(Page):
+class CourseBasePage(Page):
+    class Meta:
+        abstract = True
+
+    serialize_field_names = []
+    serialize_base_field_names = [
+        "id",
+        "title",
+        "slug",
+        "type",
+        "translation_key",
+        "frontend_url",
+    ]
+
+    def get_course_parent(self):
+        return self.get_ancestors(inclusive=True).exact_type(CoursePage).last()
+
+    def get_course(self):
+        course_parent_page = self.get_course_parent()
+        if course_parent_page:
+            return course_parent_page.specific.course
+        return None
+
+    def get_circles(self):
+        course_parent_page = self.get_course_parent()
+
+        if course_parent_page:
+            from vbv_lernwelt.learnpath.models import LearningPath
+            from vbv_lernwelt.learnpath.models import Circle
+
+            circles = (
+                course_parent_page.get_children()
+                .exact_type(LearningPath)
+                .first()
+                .get_children()
+                .exact_type(Circle)
+            )
+            return circles
+
+        return None
+
+    @classmethod
+    def get_serializer_class(cls):
+        return get_course_serializer_class(
+            cls,
+            field_names=cls.serialize_field_names,
+            base_field_names=cls.serialize_base_field_names,
+        )
+
+    def __str__(self):
+        return f"{self.title}"
+
+
+class CoursePage(CourseBasePage):
     content_panels = Page.content_panels
     subpage_types = ["learnpath.LearningPath", "media_library.MediaLibraryPage"]
     course = models.ForeignKey("course.Course", on_delete=models.PROTECT)
diff --git a/server/vbv_lernwelt/course/permissions.py b/server/vbv_lernwelt/course/permissions.py
new file mode 100644
index 00000000..f766ae37
--- /dev/null
+++ b/server/vbv_lernwelt/course/permissions.py
@@ -0,0 +1,12 @@
+from rest_framework import permissions
+
+
+class CourseAccessPermission(permissions.BasePermission):
+    def has_object_permission(self, request, view, obj):
+        # Read permissions are allowed to any request,
+        # so we'll always allow GET, HEAD or OPTIONS requests.
+        if request.method in permissions.SAFE_METHODS:
+            return True
+
+        # Instance must have an attribute named `owner`.
+        return obj.owner == request.user
diff --git a/server/vbv_lernwelt/course/serializer_helpers.py b/server/vbv_lernwelt/course/serializer_helpers.py
new file mode 100644
index 00000000..6ba4c494
--- /dev/null
+++ b/server/vbv_lernwelt/course/serializer_helpers.py
@@ -0,0 +1,42 @@
+from rest_framework.fields import SerializerMethodField
+
+from vbv_lernwelt.core.serializer_helpers import ItWagtailBaseSerializer, \
+    get_it_serializer_class
+
+
+class CourseBaseSerializer(ItWagtailBaseSerializer):
+    course = SerializerMethodField()
+    course_category = SerializerMethodField()
+    circles = SerializerMethodField()
+
+    meta_fields = []
+
+    def get_course(self, obj):
+        course = obj.get_course()
+        if course:
+            from vbv_lernwelt.course.serializers import CourseSerializer
+
+            return CourseSerializer(course).data
+        return ""
+
+    def get_course_category(self, obj):
+        from vbv_lernwelt.course.serializers import CourseCategorySerializer
+
+        return CourseCategorySerializer(obj.course_category).data
+
+    def get_circles(self, obj):
+        circles = obj.get_circles()
+
+        if circles:
+            return [
+                {"id": c.id, "title": c.title, "translation_key": c.translation_key}
+                for c in circles
+            ]
+
+        return []
+
+
+def get_course_serializer_class(model, field_names=None, base_field_names=None):
+    return get_it_serializer_class(
+        model, field_names, base_field_names, CourseBaseSerializer
+    )
diff --git a/server/vbv_lernwelt/course/serializers.py b/server/vbv_lernwelt/course/serializers.py
index 49bf8b6d..869b04c0 100644
--- a/server/vbv_lernwelt/course/serializers.py
+++ b/server/vbv_lernwelt/course/serializers.py
@@ -1,6 +1,10 @@
 from rest_framework import serializers
 
-from vbv_lernwelt.course.models import Course, CourseCategory, CourseCompletion
+from vbv_lernwelt.course.models import (
+    Course,
+    CourseCategory,
+    CourseCompletion,
+)
 
 
 class CourseSerializer(serializers.ModelSerializer):
diff --git a/server/vbv_lernwelt/learnpath/models.py b/server/vbv_lernwelt/learnpath/models.py
index bdef9301..876be769 100644
--- a/server/vbv_lernwelt/learnpath/models.py
+++ b/server/vbv_lernwelt/learnpath/models.py
@@ -8,8 +8,7 @@ from wagtail.images.blocks import ImageChooserBlock
 from wagtail.models import Page
 
 from vbv_lernwelt.core.model_utils import find_available_slug
-from vbv_lernwelt.core.serializer_helpers import get_it_serializer_class
-from vbv_lernwelt.course.models import CoursePage
+from vbv_lernwelt.course.models import CoursePage, CourseBasePage
 from vbv_lernwelt.learnpath.models_learning_unit_content import (
     AssignmentBlock,
     BookBlock,
@@ -25,7 +24,8 @@ from vbv_lernwelt.learnpath.models_learning_unit_content import (
 )
 
 
-class LearningPath(Page):
+class LearningPath(CourseBasePage):
+    serialize_field_names = ["children", "course"]
     content_panels = Page.content_panels
     subpage_types = ["learnpath.Circle", "learnpath.Topic"]
     parent_page_types = ["course.CoursePage"]
@@ -45,19 +45,10 @@ class LearningPath(Page):
     def get_frontend_url(self):
         return f"/learn/{self.slug}"
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            [
-                "children",
-                "course",
-            ],
-        )
 
+class Topic(CourseBasePage):
+    serialize_field_names = ["is_visible"]
 
-class Topic(Page):
-    # title = models.TextField(default='')
     is_visible = models.BooleanField(default=True)
 
     parent_page_types = ["learnpath.LearningPath"]
@@ -67,27 +58,10 @@ class Topic(Page):
         FieldPanel("is_visible"),
     ]
 
-    # content_panels = Page.content_panels + [
-    #     FieldPanel('is_visible', classname="full"),
-    #     PageChooserPanel('learning_path',  'learnpath.LearningPath'),
-    # ]
-
-    # parent_page_types = ['learnpath.LearningPath']
-    # subpage_types = ['learnpath.Circle']
-
     def full_clean(self, *args, **kwargs):
         self.slug = find_slug_with_parent_prefix(self, "topic")
         super(Topic, self).full_clean(*args, **kwargs)
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            field_names=[
-                "is_visible",
-            ],
-        )
-
     def get_admin_display_title(self):
         return f"Thema: {self.draft_title}"
 
@@ -109,7 +83,7 @@ class PersonBlock(blocks.StructBlock):
         icon = "user"
 
 
-class Circle(Page):
+class Circle(CourseBasePage):
     parent_page_types = ["learnpath.LearningPath"]
     subpage_types = [
         "learnpath.LearningSequence",
@@ -117,6 +91,16 @@ class Circle(Page):
         "learnpath.LearningContent",
     ]
 
+    serialize_field_names = [
+        "children",
+        "description",
+        "goal_description",
+        "goals",
+        "job_situation_description",
+        "job_situations",
+        "experts",
+    ]
+
     description = models.TextField(default="", blank=True)
 
     goal_description = models.TextField(default="", blank=True)
@@ -148,21 +132,6 @@ class Circle(Page):
         FieldPanel("experts"),
     ]
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            field_names=[
-                "children",
-                "description",
-                "goal_description",
-                "goals",
-                "job_situation_description",
-                "job_situations",
-                "experts",
-            ],
-        )
-
     def get_frontend_url(self):
         short_slug = self.slug.replace(f"{self.get_parent().slug}-circle-", "")
         return f"{self.get_parent().specific.get_frontend_url()}/{short_slug}"
@@ -178,7 +147,9 @@ class Circle(Page):
         return f"{self.title}"
 
 
-class LearningSequence(Page):
+class LearningSequence(CourseBasePage):
+    serialize_field_names = ["icon"]
+
     parent_page_types = ["learnpath.Circle"]
     subpage_types = []
 
@@ -194,10 +165,6 @@ class LearningSequence(Page):
     def __str__(self):
         return f"{self.title}"
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(cls, field_names=["icon"])
-
     def get_admin_display_title(self):
         return f"{self.icon} {self.draft_title}"
 
@@ -220,7 +187,7 @@ class LearningSequence(Page):
         return f"{self.get_parent().specific.get_frontend_url()}#{short_slug}"
 
 
-class LearningUnit(Page):
+class LearningUnit(CourseBasePage):
     parent_page_types = ["learnpath.Circle"]
     subpage_types = []
     course_category = models.ForeignKey(
@@ -277,7 +244,12 @@ class LearningUnit(Page):
         return f'<span style="font-weight: 700; font-size: 20px;">{self.draft_title}</span>'
 
 
-class LearningContent(Page):
+class LearningContent(CourseBasePage):
+    serialize_field_names = [
+        "minutes",
+        "contents",
+    ]
+
     parent_page_types = ["learnpath.Circle"]
     subpage_types = []
 
@@ -335,19 +307,6 @@ class LearningContent(Page):
         self.slug = find_slug_with_parent_prefix(self, "lc")
         super(LearningContent, self).full_clean(*args, **kwargs)
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            field_names=[
-                "minutes",
-                "contents",
-            ],
-        )
-
-    def __str__(self):
-        return f"{self.title}"
-
 
 def find_slug_with_parent_prefix(page, type_prefix, slug_postfix=None):
     parent_slug = page.get_ancestors().exact_type(LearningPath, Circle).last().slug
diff --git a/server/vbv_lernwelt/learnpath/serializers.py b/server/vbv_lernwelt/learnpath/serializers.py
index 3cb8d2f3..3cfa7587 100644
--- a/server/vbv_lernwelt/learnpath/serializers.py
+++ b/server/vbv_lernwelt/learnpath/serializers.py
@@ -3,14 +3,14 @@ from rest_framework.fields import SerializerMethodField
 from vbv_lernwelt.competence.serializers import (
     PerformanceCriteriaLearningPathSerializer,
 )
-from vbv_lernwelt.core.serializer_helpers import get_it_serializer_class
+from vbv_lernwelt.course.serializer_helpers import get_course_serializer_class
 from vbv_lernwelt.learnpath.models import LearningUnit
 
 
 class LearningUnitSerializer(
-    get_it_serializer_class(
+    get_course_serializer_class(
         LearningUnit,
-        [
+        field_names=[
             "evaluate_url",
             "course_category",
             "children",
@@ -30,9 +30,9 @@ class LearningUnitSerializer(
 
 
 class LearningUnitPerformanceCriteriaSerializer(
-    get_it_serializer_class(
+    get_course_serializer_class(
         LearningUnit,
-        [
+        field_names=[
             "evaluate_url",
             "course_category",
         ],
diff --git a/server/vbv_lernwelt/media_library/models.py b/server/vbv_lernwelt/media_library/models.py
index e3e1fe2a..534c2a96 100644
--- a/server/vbv_lernwelt/media_library/models.py
+++ b/server/vbv_lernwelt/media_library/models.py
@@ -7,11 +7,13 @@ from wagtail.fields import StreamField
 from wagtail.models import Page
 
 from vbv_lernwelt.core.model_utils import find_available_slug
-from vbv_lernwelt.core.serializer_helpers import get_it_serializer_class
+from vbv_lernwelt.course.models import CourseBasePage
 from vbv_lernwelt.media_library.content_blocks import MediaContentCollection
 
 
-class MediaLibraryPage(Page):
+class MediaLibraryPage(CourseBasePage):
+    serialize_field_names = ["course", "children"]
+
     parent_page_types = ["course.CoursePage"]
     subpage_types = ["media_library.MediaCategoryPage"]
 
@@ -28,22 +30,23 @@ class MediaLibraryPage(Page):
     def get_frontend_url(self):
         return f"/media/{self.slug}"
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            [
-                "course",
-                "children",
-            ],
-        )
 
-
-class MediaCategoryPage(Page):
+class MediaCategoryPage(CourseBasePage):
     """
     Handlungsfeld. zB. Fahrzeug
     """
 
+    serialize_field_names = [
+        "course_category",
+        "introduction_text",
+        "overview_icon",
+        "detail_image",
+        "description_title",
+        "description_text",
+        "items",
+        "body",
+    ]
+
     course_category = models.ForeignKey(
         "course.CourseCategory", on_delete=models.SET_NULL, null=True, blank=True
     )
@@ -89,22 +92,6 @@ class MediaCategoryPage(Page):
         short_slug = self.slug.replace(f"{self.get_parent().slug}-cat-", "")
         return f"{self.get_parent().specific.get_frontend_url()}/category/{short_slug}"
 
-    @classmethod
-    def get_serializer_class(cls):
-        return get_it_serializer_class(
-            cls,
-            field_names=[
-                "course_category",
-                "introduction_text",
-                "overview_icon",
-                "detail_image",
-                "description_title",
-                "description_text",
-                "items",
-                "body",
-            ],
-        )
-
 
 class LibraryDocument(AbstractDocument):
     # Todo: check https://filepreviews.io/