diff --git a/tools/watermark_rules.inc.php b/tools/watermark_rules.inc.php
new file mode 100644
index 0000000..ca973eb
--- /dev/null
+++ b/tools/watermark_rules.inc.php
@@ -0,0 +1,28 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_get_watermark_rules()
+{
+  return query2array('SELECT * FROM '.bratonien_tools_table('watermark_rules').' ORDER BY category_id');
+}
+
+function bratonien_tools_save_watermark_rule()
+{
+  $category_id = (int)($_POST['category_id'] ?? 0);
+  $mode = (string)($_POST['rule_mode'] ?? 'inherit');
+  $profile_id = !empty($_POST['rule_profile']) ? (int)$_POST['rule_profile'] : 'NULL';
+
+  if ($category_id <= 0)
+  {
+    throw new RuntimeException('Kein Album ausgewaehlt.');
+  }
+
+  pwg_query('DELETE FROM '.bratonien_tools_table('watermark_rules').' WHERE category_id='.$category_id);
+
+  pwg_query("INSERT INTO ".bratonien_tools_table('watermark_rules')." (category_id, mode, profile_id) VALUES (".$category_id.", '".pwg_db_real_escape_string($mode)."', ".($profile_id === 'NULL' ? 'NULL' : $profile_id).")");
+
+  return array('message'=>'Album-Wasserzeichenregel gespeichert.');
+}