diff --git a/webdav-derivative.php b/webdav-derivative.php
deleted file mode 100644
index d5ed27e..0000000
--- a/webdav-derivative.php
+++ /dev/null
@@ -1,169 +0,0 @@
-<?php
-define('PHPWG_ROOT_PATH', '../../');
-include_once(PHPWG_ROOT_PATH.'include/common.inc.php');
-
-if (!defined('BRATONIEN_TOOLS_PATH'))
-{
-  define('BRATONIEN_TOOLS_ID', basename(__DIR__));
-  define('BRATONIEN_TOOLS_PATH', PHPWG_ROOT_PATH.'plugins/'.BRATONIEN_TOOLS_ID.'/');
-}
-
-require_once(BRATONIEN_TOOLS_PATH.'include/webdav_image_runtime.inc.php');
-require_once(BRATONIEN_TOOLS_PATH.'include/webdav_gallery_runtime.inc.php');
-
-function bratonien_tools_webdav_derivative_abort($status, $message)
-{
-  http_response_code((int)$status);
-  header('Content-Type: text/plain; charset=utf-8');
-  header('Cache-Control: no-store');
-  echo $message;
-  exit;
-}
-
-function bratonien_tools_webdav_derivative_ajax_response($url)
-{
-  http_response_code(200);
-  header('Content-Type: application/json; charset=utf-8');
-  header('Cache-Control: no-store, max-age=0');
-  echo json_encode(array('url'=>(string)$url), JSON_UNESCAPED_SLASHES);
-  exit;
-}
-
-function bratonien_tools_webdav_derivative_binary_url($image_id, $type)
-{
-  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/webdav-derivative.php?id='.(int)$image_id.'&type='.rawurlencode((string)$type);
-}
-
-function bratonien_tools_webdav_derivative_fallback($image_id)
-{
-  $url = bratonien_tools_webdav_image_url((int)$image_id, false);
-  if (!$url)
-  {
-    bratonien_tools_webdav_derivative_abort(404, 'WebDAV-Bildquelle ist nicht verfuegbar.');
-  }
-
-  if (isset($_GET['ajaxload']) && (string)$_GET['ajaxload'] === 'true')
-  {
-    bratonien_tools_webdav_derivative_ajax_response($url);
-  }
-
-  header('Cache-Control: no-store');
-  header('Location: '.$url, true, 302);
-  exit;
-}
-
-$image_id = (int)($_GET['id'] ?? 0);
-$type = trim((string)($_GET['type'] ?? ''));
-if ($image_id < 1 || $type === '')
-{
-  bratonien_tools_webdav_derivative_abort(400, 'Bild-ID oder Derivattyp fehlt.');
-}
-
-$permission_condition = get_sql_condition_FandF(array('forbidden_categories'=>'category_id'), null, true);
-$access_result = pwg_query('SELECT 1 FROM '.IMAGE_CATEGORY_TABLE.' WHERE image_id='.$image_id.' AND '.$permission_condition.' LIMIT 1');
-if (!pwg_db_num_rows($access_result))
-{
-  bratonien_tools_webdav_derivative_abort(403, 'Kein Zugriff auf dieses Bild.');
-}
-
-if (!class_exists('ImageStdParams') || !class_exists('DerivativeImage') || !class_exists('SrcImage'))
-{
-  require_once(PHPWG_ROOT_PATH.'include/derivative.inc.php');
-}
-
-$params = @ImageStdParams::get_by_type($type);
-if (!$params)
-{
-  bratonien_tools_webdav_derivative_abort(404, 'Unbekannter Piwigo-Derivattyp.');
-}
-
-$result = pwg_query('SELECT * FROM '.IMAGES_TABLE.' WHERE id='.$image_id.' LIMIT 1');
-if (!pwg_db_num_rows($result))
-{
-  bratonien_tools_webdav_derivative_abort(404, 'Bild wurde nicht gefunden.');
-}
-$row = pwg_db_fetch_assoc($result);
-$src = new SrcImage($row);
-$info = bratonien_tools_webdav_image_source_info($image_id);
-if (!$info)
-{
-  bratonien_tools_webdav_derivative_abort(404, 'Keine WebDAV-Quelle fuer dieses Bild gefunden.');
-}
-
-$preview = bratonien_tools_webdav_preview_path($info);
-if (!$preview || !is_file($preview) || !is_readable($preview))
-{
-  bratonien_tools_webdav_derivative_fallback($image_id);
-}
-
-$derivative = new DerivativeImage($params, $src);
-if ($derivative->same_as_source())
-{
-  bratonien_tools_webdav_derivative_fallback($image_id);
-}
-
-$target = $derivative->get_path();
-if ($target === '')
-{
-  bratonien_tools_webdav_derivative_fallback($image_id);
-}
-
-if (!bratonien_tools_webdav_derivative_matches_preview($target, $params, $image_id))
-{
-  if (is_file($target))
-  {
-    @unlink($target);
-    clearstatcache(true, $target);
-  }
-
-  $detail = '';
-  if (!bratonien_tools_webdav_generate_derivative($params, $src, $detail))
-  {
-    error_log('Bratonien WebDAV on-demand derivative #'.$image_id.' type='.$type.': '.$detail);
-    bratonien_tools_webdav_derivative_fallback($image_id);
-  }
-}
-
-if (!bratonien_tools_webdav_derivative_matches_preview($target, $params, $image_id))
-{
-  bratonien_tools_webdav_derivative_fallback($image_id);
-}
-
-// Piwigos thumbnails.loader.js fordert nicht gecachte Derivate mit
-// ?ajaxload=true an und erwartet JSON {"url":"..."}. Erst diese URL wird
-// danach als echtes Bild geladen. Binärdaten an dieser Stelle führen direkt
-// zum Piwigo-Fehlersymbol.
-if (isset($_GET['ajaxload']) && (string)$_GET['ajaxload'] === 'true')
-{
-  bratonien_tools_webdav_derivative_ajax_response(
-    bratonien_tools_webdav_derivative_binary_url($image_id, $type)
-  );
-}
-
-$size = @filesize($target);
-$mtime = @filemtime($target) ?: time();
-$etag = sha1($target.'|'.$mtime.'|'.($size ?: 0));
-$extension = strtolower(pathinfo($target, PATHINFO_EXTENSION));
-$content_type = 'image/jpeg';
-if ($extension === 'png') $content_type = 'image/png';
-elseif ($extension === 'gif') $content_type = 'image/gif';
-elseif ($extension === 'webp') $content_type = 'image/webp';
-
-header('Content-Type: '.$content_type);
-if ($size !== false) header('Content-Length: '.(string)$size);
-header('ETag: "'.$etag.'"');
-header('Last-Modified: '.gmdate('D, d M Y H:i:s', $mtime).' GMT');
-header('Cache-Control: private, max-age=86400, must-revalidate');
-header('X-Content-Type-Options: nosniff');
-
-$client_etag = trim((string)($_SERVER['HTTP_IF_NONE_MATCH'] ?? ''), " \t\r\n\"");
-if ($client_etag !== '' && hash_equals($etag, $client_etag))
-{
-  http_response_code(304);
-  exit;
-}
-
-if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'HEAD')
-{
-  readfile($target);
-}