diff --git a/lib/decentralised_book_index/metadata/author.ex b/lib/decentralised_book_index/metadata/author.ex
index b2f5134..6011aa0 100644
--- a/lib/decentralised_book_index/metadata/author.ex
+++ b/lib/decentralised_book_index/metadata/author.ex
@@ -3,7 +3,8 @@ defmodule DecentralisedBookIndex.Metadata.Author do
     otp_app: :decentralised_book_index,
     domain: DecentralisedBookIndex.Metadata,
     data_layer: AshPostgres.DataLayer,
-    extensions: [AshJsonApi.Resource]
+    extensions: [AshJsonApi.Resource],
+    authorizers: [Ash.Policy.Authorizer]
 
   require Ash.Query
   alias DecentralisedBookIndex.Metadata
@@ -24,11 +25,14 @@ defmodule DecentralisedBookIndex.Metadata.Author do
       primary? true
       accept [:name, :description, :avatar_url, :author_alias_registry_id]
 
-      change fn changeset, _ ->
+      change fn changeset, context ->
+        actor = Map.get(context, :actor, nil)
+
         registry_id = Ash.Changeset.get_attribute(changeset, :author_alias_registry_id)
 
         if registry_id == nil do
-          {:ok, registry} = DecentralisedBookIndex.Metadata.create_author_alias_registry()
+          {:ok, registry} =
+            DecentralisedBookIndex.Metadata.create_author_alias_registry(actor: actor)
 
           Ash.Changeset.force_change_attribute(changeset, :author_alias_registry_id, registry.id)
         else
@@ -74,11 +78,13 @@ defmodule DecentralisedBookIndex.Metadata.Author do
         :dbi_server_id
       ]
 
-      change fn changeset, _ ->
+      change fn changeset, context ->
+        actor = Map.get(context, :actor, nil)
         registry_id = Ash.Changeset.get_attribute(changeset, :author_alias_registry_id)
 
         if registry_id == nil do
-          {:ok, registry} = DecentralisedBookIndex.Metadata.create_author_alias_registry()
+          {:ok, registry} =
+            DecentralisedBookIndex.Metadata.create_author_alias_registry(actor: actor)
 
           Ash.Changeset.force_change_attribute(changeset, :author_alias_registry_id, registry.id)
         else
@@ -135,6 +141,7 @@ defmodule DecentralisedBookIndex.Metadata.Author do
     end
 
     update :sync do
+      description "Sync the data for an existing record."
       require_atomic? false
 
       accept [
@@ -171,6 +178,32 @@ defmodule DecentralisedBookIndex.Metadata.Author do
     end
   end
 
+  policies do
+    bypass actor_attribute_equals(:role, :admin) do
+      authorize_if always()
+    end
+
+    policy action_type(:read) do
+      authorize_if always()
+    end
+
+    policy action(:get_author_ids) do
+      authorize_if always()
+    end
+
+    policy action_type(:create) do
+      authorize_if actor_attribute_equals(:role, :moderator)
+    end
+
+    policy action_type(:update) do
+      authorize_if actor_attribute_equals(:role, :moderator)
+    end
+
+    policy action_type(:destroy) do
+      authorize_if actor_attribute_equals(:role, :admin)
+    end
+  end
+
   attributes do
     uuid_primary_key :id, writable?: true
 
diff --git a/test/decentralised_book_index/metadata/author_test.exs b/test/decentralised_book_index/metadata/author_test.exs
index 65a84da..d1a6f26 100644
--- a/test/decentralised_book_index/metadata/author_test.exs
+++ b/test/decentralised_book_index/metadata/author_test.exs
@@ -3,45 +3,50 @@ defmodule DecentralisedBookIndex.Metadata.AuthorTest do
 
   alias DecentralisedBookIndex.Metadata
 
+  setup do
+    user = generate(user(role: :moderator))
+    %{user: user}
+  end
+
   describe "authors and registries relationship" do
-    test "a new author get new registry by default" do
-      assert {:ok, author} = Metadata.create_author("Author", "An description")
+    test "a new author get new registry by default", %{user: user} do
+      assert {:ok, author} = Metadata.create_author("Author", "An description", nil, nil, actor: user)
       assert author.author_alias_registry_id != nil
     end
 
-    test "a new author belongs to a registry if specified" do
-      assert {:ok, registry} = Metadata.create_author_alias_registry()
-      assert {:ok, author} = Metadata.create_author("Author", "An description", nil, registry.id)
+    test "a new author belongs to a registry if specified", %{user: user} do
+      assert {:ok, registry} = Metadata.create_author_alias_registry(actor: user)
+      assert {:ok, author} = Metadata.create_author("Author", "An description", nil, registry.id, actor: user)
       assert author.author_alias_registry_id == registry.id
     end
 
-    test "a new author to a registry via a related author record" do
-      {:ok, related_author} = Metadata.create_author("Author",  "An description")
+    test "a new author to a registry via a related author record", %{user: user} do
+      {:ok, related_author} = Metadata.create_author("Author",  "An description", nil, nil, actor: user)
 
       assert {:ok, author} =
-        Metadata.add_author_to_related_alias_registry("Author2", "An description2", related_author.id)
+        Metadata.add_author_to_related_alias_registry("Author2", "An description2", related_author.id, nil, actor: user)
 
       assert related_author.author_alias_registry_id == author.author_alias_registry_id
     end
 
-    test "a new author to a registry via a empty related author record" do
+    test "a new author to a registry via a empty related author record", %{user: user} do
       assert {:error, _} =
-        Metadata.add_author_to_related_alias_registry("Author2", "An description2", nil)
+        Metadata.add_author_to_related_alias_registry("Author2", "An description2", nil, actor: user)
     end
   end
 
   describe "authors alternatives names" do
-    test "new author has no alternatives names" do
-      {:ok, author} = Metadata.create_author("Author", "An description")
+    test "new author has no alternatives names", %{user: user} do
+      {:ok, author} = Metadata.create_author("Author", "An description", nil, nil, actor: user)
       assert {:ok, alternatives_names} = Metadata.get_author_alternative_names(author)
       assert alternatives_names = []
     end
 
-    test "author has related author so they has one alternative name" do
-      {:ok, related_author} = Metadata.create_author("Author",  "An description")
+    test "author has related author so they has one alternative name", %{user: user} do
+      {:ok, related_author} = Metadata.create_author("Author",  "An description", nil, nil, actor: user)
 
       {:ok, author} =
-        Metadata.add_author_to_related_alias_registry("Author2", "An description2", related_author.id)
+        Metadata.add_author_to_related_alias_registry("Author2", "An description2", related_author.id, nil, actor: user)
 
       assert {:ok, alternatives_names} = Metadata.get_author_alternative_names(author)
       assert alternatives_names = [related_author]
@@ -49,19 +54,19 @@ defmodule DecentralisedBookIndex.Metadata.AuthorTest do
   end
 
   describe "author's ids" do
-    test "the list has the author's id" do
-      {:ok, author} = Metadata.create_author("Author", "An description")
+    test "the list has the author's id", %{user: user} do
+      {:ok, author} = Metadata.create_author("Author", "An description", nil, nil, actor: user)
 
-      assert {:ok, ids} = Metadata.get_author_ids(author)
+      assert {:ok, ids} = Metadata.get_author_ids(author, actor: user)
       assert author.id in ids
     end
 
-    test "the list has the aliases' ids" do
-      {:ok, author} = Metadata.create_author("Author", "An description")
+    test "the list has the aliases' ids", %{user: user} do
+      {:ok, author} = Metadata.create_author("Author", "An description", nil, nil, actor: user)
       {:ok, alias1} =
-        Metadata.add_author_to_related_alias_registry("Author2", "An description2", author.id)
+        Metadata.add_author_to_related_alias_registry("Author2", "An description2", author.id, nil, actor: user)
       {:ok, alias2} =
-        Metadata.add_author_to_related_alias_registry("Author3", "An description3", author.id)
+        Metadata.add_author_to_related_alias_registry("Author3", "An description3", author.id, nil, actor: user)
 
       assert {:ok, ids} = Metadata.get_author_ids(author)
 
@@ -72,15 +77,15 @@ defmodule DecentralisedBookIndex.Metadata.AuthorTest do
   end
 
   describe "authors and avatar_url" do
-    test "a new author has no avatar by default" do
-      assert {:ok, author} = Metadata.create_author("Author", "An description")
+    test "a new author has no avatar by default", %{user: user} do
+      assert {:ok, author} = Metadata.create_author("Author", "An description", nil, nil, actor: user)
       assert author.avatar_url == nil
     end
 
-    test "a new author has a avatar" do
+    test "a new author has a avatar", %{user: user} do
       avatar_url = "/images/avatar.png"
 
-      assert {:ok, author} = Metadata.create_author("Author", "An description", avatar_url)
+      assert {:ok, author} = Metadata.create_author("Author", "An description", avatar_url, nil, actor: user)
       assert author.avatar_url == avatar_url
     end
   end