diff --git a/models.yml b/models.yml
index 2fe124db..2395c46f 100644
--- a/models.yml
+++ b/models.yml
@@ -207,6 +207,10 @@ organization:
     to: mediafile/owner_id
     on_delete: CASCADE
     restriction_mode: A
+  published_mediafile_ids:
+    type: relation-list
+    to: mediafile/published_to_meetings_in_organization_id
+    restriction_mode: E
   user_ids:
     type: relation-list
     restriction_mode: C
@@ -1543,6 +1547,11 @@ meeting:
     to: group/meeting_id
     on_delete: CASCADE
     restriction_mode: B
+  meeting_mediafile_ids:
+    type: relation-list
+    to: meeting_mediafile/meeting_id
+    on_delete: CASCADE
+    restriction_mode: B
   mediafile_ids:
     type: relation-list
     to: mediafile/owner_id
@@ -1662,67 +1671,67 @@ meeting:
   # Logos and Fonts
   logo_projector_main_id:
     type: relation
-    to: mediafile/used_as_logo_projector_main_in_meeting_id
+    to: meeting_mediafile/used_as_logo_projector_main_in_meeting_id
     restriction_mode: B
   logo_projector_header_id:
     type: relation
-    to: mediafile/used_as_logo_projector_header_in_meeting_id
+    to: meeting_mediafile/used_as_logo_projector_header_in_meeting_id
     restriction_mode: B
   logo_web_header_id:
     type: relation
-    to: mediafile/used_as_logo_web_header_in_meeting_id
+    to: meeting_mediafile/used_as_logo_web_header_in_meeting_id
     restriction_mode: B
   logo_pdf_header_l_id:
     type: relation
-    to: mediafile/used_as_logo_pdf_header_l_in_meeting_id
+    to: meeting_mediafile/used_as_logo_pdf_header_l_in_meeting_id
     restriction_mode: B
   logo_pdf_header_r_id:
     type: relation
-    to: mediafile/used_as_logo_pdf_header_r_in_meeting_id
+    to: meeting_mediafile/used_as_logo_pdf_header_r_in_meeting_id
     restriction_mode: B
   logo_pdf_footer_l_id:
     type: relation
-    to: mediafile/used_as_logo_pdf_footer_l_in_meeting_id
+    to: meeting_mediafile/used_as_logo_pdf_footer_l_in_meeting_id
     restriction_mode: B
   logo_pdf_footer_r_id:
     type: relation
-    to: mediafile/used_as_logo_pdf_footer_r_in_meeting_id
+    to: meeting_mediafile/used_as_logo_pdf_footer_r_in_meeting_id
     restriction_mode: B
   logo_pdf_ballot_paper_id:
     type: relation
-    to: mediafile/used_as_logo_pdf_ballot_paper_in_meeting_id
+    to: meeting_mediafile/used_as_logo_pdf_ballot_paper_in_meeting_id
     restriction_mode: B
   font_regular_id:
     type: relation
-    to: mediafile/used_as_font_regular_in_meeting_id
+    to: meeting_mediafile/used_as_font_regular_in_meeting_id
     restriction_mode: B
   font_italic_id:
     type: relation
-    to: mediafile/used_as_font_italic_in_meeting_id
+    to: meeting_mediafile/used_as_font_italic_in_meeting_id
     restriction_mode: B
   font_bold_id:
     type: relation
-    to: mediafile/used_as_font_bold_in_meeting_id
+    to: meeting_mediafile/used_as_font_bold_in_meeting_id
     restriction_mode: B
   font_bold_italic_id:
     type: relation
-    to: mediafile/used_as_font_bold_italic_in_meeting_id
+    to: meeting_mediafile/used_as_font_bold_italic_in_meeting_id
     restriction_mode: B
   font_monospace_id:
     type: relation
-    to: mediafile/used_as_font_monospace_in_meeting_id
+    to: meeting_mediafile/used_as_font_monospace_in_meeting_id
     restriction_mode: B
   font_chyron_speaker_name_id:
     type: relation
-    to: mediafile/used_as_font_chyron_speaker_name_in_meeting_id
+    to: meeting_mediafile/used_as_font_chyron_speaker_name_in_meeting_id
     restriction_mode: B
   font_projector_h1_id:
     type: relation
-    to: mediafile/used_as_font_projector_h1_in_meeting_id
+    to: meeting_mediafile/used_as_font_projector_h1_in_meeting_id
     restriction_mode: B
   font_projector_h2_id:
     type: relation
-    to: mediafile/used_as_font_projector_h2_in_meeting_id
+    to: meeting_mediafile/used_as_font_projector_h2_in_meeting_id
     restriction_mode: B
   # Other relations
   committee_id:
@@ -1964,14 +1973,14 @@ group:
     to: meeting/anonymous_group_id
     on_delete: PROTECT
     restriction_mode: A
-  mediafile_access_group_ids:
+  meeting_mediafile_access_group_ids:
     type: relation-list
-    to: mediafile/access_group_ids
+    to: meeting_mediafile/access_group_ids
     equal_fields: meeting_id
     restriction_mode: A
-  mediafile_inherited_access_group_ids:
+  meeting_mediafile_inherited_access_group_ids:
     type: relation-list
-    to: mediafile/inherited_access_group_ids
+    to: meeting_mediafile/inherited_access_group_ids
     description: Calculated field.
     read_only: true
     restriction_mode: A
@@ -2201,7 +2210,7 @@ list_of_speakers:
         - motion_block
         - assignment
         - topic
-        - mediafile
+        - meeting_mediafile
       field: list_of_speakers_id
     required: true
     equal_fields: meeting_id
@@ -2396,9 +2405,9 @@ topic:
     restriction_mode: A
     constant: true
 
-  attachment_ids:
+  attachment_meeting_mediafile_ids:
     type: relation-list
-    to: mediafile/attachment_ids
+    to: meeting_mediafile/attachment_ids
     equal_fields: meeting_id
     restriction_mode: A
   agenda_item_id:
@@ -2676,9 +2685,9 @@ motion:
     to: tag/tagged_ids
     equal_fields: meeting_id
     restriction_mode: C
-  attachment_ids:
+  attachment_meeting_mediafile_ids:
     type: relation-list
-    to: mediafile/attachment_ids
+    to: meeting_mediafile/attachment_ids
     equal_fields: meeting_id
     restriction_mode: C
   projection_ids:
@@ -3577,9 +3586,9 @@ assignment:
     to: tag/tagged_ids
     equal_fields: meeting_id
     restriction_mode: A
-  attachment_ids:
+  attachment_meeting_mediafile_ids:
     type: relation-list
-    to: mediafile/attachment_ids
+    to: meeting_mediafile/attachment_ids
     equal_fields: meeting_id
     restriction_mode: A
   projection_ids:
@@ -3710,24 +3719,12 @@ mediafile:
   create_timestamp:
     type: timestamp
     restriction_mode: A
-  is_public:
-    type: boolean
-    description: "Calculated field. inherited_access_group_ids == [] can have two causes: cancelling access groups (=> is_public := false) or no access groups at all (=> is_public := true)"
-    read_only: true
-    required: true
-    restriction_mode: A
   token:
     type: string
     restriction_mode: A
-  inherited_access_group_ids:
-    type: relation-list
-    to: group/mediafile_inherited_access_group_ids
-    description: Calculated field.
-    read_only: true
-    restriction_mode: A
-  access_group_ids:
-    type: relation-list
-    to: group/mediafile_access_group_ids
+  published_to_meetings_in_organization_id:
+    type: relation
+    to: organization/published_mediafile_ids
     restriction_mode: A
   parent_id:
     type: relation
@@ -3739,6 +3736,49 @@ mediafile:
     to: mediafile/parent_id
     equal_fields: owner_id
     restriction_mode: A
+  owner_id:
+    type: generic-relation
+    to:
+      - meeting/mediafile_ids
+      - organization/mediafile_ids
+    restriction_mode: A
+    required: true
+    constant: true
+  meeting_mediafile_ids:
+    type: relation-list
+    to: meeting_mediafile/mediafile_id
+    on_delete: CASCADE
+    restriction_mode: A
+
+meeting_mediafile:
+  id:
+    type: number
+    restriction_mode: A
+    constant: true
+  mediafile_id:
+    type: relation
+    to: mediafile/meeting_mediafile_ids
+    required: true
+    restriction_mode: A
+  meeting_id:
+    type: relation
+    to: meeting/meeting_mediafile_ids
+    required: true
+    restriction_mode: A
+  is_public:
+    type: boolean
+    description: "Calculated in actions. Used to discern whether the (meeting-)mediafile can be seen by everyone, because, in the case of inherited_access_group_ids == [], it would otherwise not be clear. inherited_access_group_ids == [] can have two causes: cancelling access groups (=> is_public := false) or no access groups at all (=> is_public := true)"
+    required: true
+    restriction_mode: A
+  inherited_access_group_ids:
+    type: relation-list
+    to: group/meeting_mediafile_inherited_access_group_ids
+    description: Calculated in actions. Shows what access group permissions are actually relevant. Calculated as the intersection of this meeting_mediafiles access_group_ids and the related mediafiles potential parent mediafiles inherited_access_group_ids. If the parent has no meeting_mediafile for this meeting, its inherited access group is assumed to be the meetings admin group. If there is no parent, the inherited_access_group_ids is equal to the access_group_ids. If the access_group_ids are empty, the interpretations is that every group has access rights, therefore the parent inherited_access_group_ids are used as-is.
+    restriction_mode: A
+  access_group_ids:
+    type: relation-list
+    to: group/meeting_mediafile_access_group_ids
+    restriction_mode: A
   list_of_speakers_id:
     type: relation
     to: list_of_speakers/content_object_id
@@ -3756,16 +3796,8 @@ mediafile:
         - motion
         - topic
         - assignment
-      field: attachment_ids
+      field: attachment_meeting_mediafile_ids
     restriction_mode: A
-  owner_id:
-    type: generic-relation
-    to:
-      - meeting/mediafile_ids
-      - organization/mediafile_ids
-    restriction_mode: A
-    required: true
-    constant: true
 
   # Reverse relations for meetings, if a mediafile is used as a special resource
   used_as_logo_projector_main_in_meeting_id:
@@ -4063,7 +4095,7 @@ projection:
     to:
       - meeting/projection_ids
       - motion/projection_ids
-      - mediafile/projection_ids
+      - meeting_mediafile/projection_ids
       - list_of_speakers/projection_ids
       - motion_block/projection_ids
       - assignment/projection_ids