diff --git a/js/watermark.js b/js/watermark.js
index 0895e83..f3e5110 100644
--- a/js/watermark.js
+++ b/js/watermark.js
@@ -7,7 +7,8 @@
         const container = $('#lelms-watermark');
         const username = lelmsData.username;
         
-        // 使用 Math.max 获取真实文档高度
+        if (!username) return;
+        
         const documentHeight = Math.max(
             $(document).height(),
             $(window).height(),
@@ -22,7 +23,6 @@
         const rows = Math.ceil(documentHeight / spacing);
         const cols = Math.ceil(windowWidth / spacing);
         
-        // 使用文档片段优化性能
         const fragment = document.createDocumentFragment();
         for (let i = 0; i < rows; i++) {
             for (let j = 0; j < cols; j++) {
@@ -47,7 +47,6 @@
     function preventDevTools() {
         if (options.enable_devtools_protection !== 'yes') return;
 
-        // 优化的事件处理
         document.addEventListener('keydown', function(e) {
             if (e.key === 'F12' || 
                 (e.ctrlKey && e.shiftKey && e.key === 'I') || 
@@ -58,7 +57,6 @@
             }
         });
 
-        // 改进的右键菜单处理
         document.addEventListener('contextmenu', function(e) {
             const target = e.target;
             const allowedSelectors = [
@@ -76,13 +74,12 @@
             }
         });
 
-        // 优化的开发者工具检测
         let devToolsCounter = 0;
         let lastCheck = Date.now();
         
         const checkDevTools = () => {
             const now = Date.now();
-            if (now - lastCheck < 800) return; // 防止过于频繁检查
+            if (now - lastCheck < 800) return;
             lastCheck = now;
 
             const threshold = 160;
@@ -134,22 +131,25 @@
         });
     }
 
-    // 初始化
     $(document).ready(function() {
         preventDevTools();
-        addWatermark();
+        if (lelmsData.username) {
+            addWatermark();
+        }
         preventCopy();
         
-        // 使用 ResizeObserver 监听尺寸变化
         const resizeObserver = new ResizeObserver(_.debounce(() => {
-            addWatermark();
+            if (lelmsData.username) {
+                addWatermark();
+            }
         }, 200));
         
         resizeObserver.observe(document.body);
 
-        // 监听动态内容变化
         const mutationObserver = new MutationObserver(_.debounce(() => {
-            addWatermark();
+            if (lelmsData.username) {
+                addWatermark();
+            }
         }, 200));
         
         mutationObserver.observe(document.body, {
@@ -158,10 +158,9 @@
             attributes: true
         });
 
-        // 清理函数
         $(window).on('unload', () => {
             resizeObserver.disconnect();
             mutationObserver.disconnect();
         });
     });
-})(jQuery);
+})(jQuery);
\ No newline at end of file
diff --git a/lelms-copyright.php b/lelms-copyright.php
index 2e33b80..573cc36 100644
--- a/lelms-copyright.php
+++ b/lelms-copyright.php
@@ -3,7 +3,7 @@
  * Plugin Name: LeLMS Copyright
  * Plugin URI: https://wenpai.org/plugins/lelms-copyright
  * Description: Adds watermark with username and prevents unauthorized screenshots
- * Version: 1.1.7
+ * Version: 1.1.8
  * Author: LeLMS.com
  * Author URI: https://lelms.com
  * License: GPL v2 or later
@@ -18,7 +18,7 @@ if (!defined('ABSPATH')) {
     exit;
 }
 
-define('LELMS_COPYRIGHT_VERSION', '1.1.7');
+define('LELMS_COPYRIGHT_VERSION', '1.1.8');
 define('LELMS_COPYRIGHT_DIR_URL', plugin_dir_url(__FILE__));
 define('LELMS_COPYRIGHT_DIR_PATH', plugin_dir_path(__FILE__));
 define('LELMS_COPYRIGHT_BASENAME', plugin_basename(__FILE__));
@@ -78,11 +78,11 @@ class LELMS_Copyright {
     }
 
     public function register_settings() {
-      if (!isset($_GET['page']) || $_GET['page'] !== 'lelms-copyright') {
-              return;
-          }
+        register_setting('lelms_copyright', 'lelms_copyright_options', array($this, 'sanitize_options'));
 
-          register_setting('lelms_copyright', 'lelms_copyright_options', array($this, 'sanitize_options'));
+        if (!isset($_GET['page']) || $_GET['page'] !== 'lelms-copyright') {
+            return;
+        }
 
         add_settings_section(
             'lelms_copyright_section',
@@ -135,7 +135,7 @@ class LELMS_Copyright {
         $sanitized['watermark_spacing'] = absint($input['watermark_spacing']);
         $sanitized['watermark_color'] = sanitize_hex_color($input['watermark_color']);
         $sanitized['watermark_angle'] = intval($input['watermark_angle']);
-        $sanitilized['enable_devtools_protection'] = isset($input['enable_devtools_protection']) && $input['enable_devtools_protection'] === 'yes' ? 'yes' : 'no';
+        $sanitized['enable_devtools_protection'] = isset($input['enable_devtools_protection']) && $input['enable_devtools_protection'] === 'yes' ? 'yes' : 'no';
         $sanitized['enable_print_protection'] = isset($input['enable_print_protection']) && $input['enable_print_protection'] === 'yes' ? 'yes' : 'no';
         $sanitized['enable_copy_protection'] = isset($input['enable_copy_protection']) && $input['enable_copy_protection'] === 'yes' ? 'yes' : 'no';
         $sanitized['enable_for_guests'] = isset($input['enable_for_guests']) && $input['enable_for_guests'] === 'yes' ? 'yes' : 'no';
@@ -143,7 +143,7 @@ class LELMS_Copyright {
         $sanitized['enable_guest_custom_watermark'] = isset($input['enable_guest_custom_watermark']) && $input['enable_guest_custom_watermark'] === 'yes' ? 'yes' : 'no';
         $sanitized['enable_custom_watermark'] = isset($input['enable_custom_watermark']) && $input['enable_custom_watermark'] === 'yes' ? 'yes' : 'no';
         $sanitized['custom_watermark_text'] = sanitize_text_field($input['custom_watermark_text']);
-        $sanitized['watermark_type'] = in_array($input['watermark_type'], ['username', 'nickname', 'email', 'timestamp']) ? $input['watermark_type'] : 'username';
+        $sanitized['watermark_type'] = in_array($input['watermark_type'], ['none', 'username', 'nickname', 'email', 'timestamp']) ? $input['watermark_type'] : 'username';
         $sanitized['excluded_post_types'] = array_map('sanitize_key', (array) $input['excluded_post_types']);
         $sanitized['excluded_roles'] = array_map('sanitize_key', (array) $input['excluded_roles']);
 
@@ -151,11 +151,6 @@ class LELMS_Copyright {
     }
 
     public function should_apply_protection() {
-        $enable_for_guests = $this->options['enable_for_guests'] === 'yes';
-        if (!is_user_logged_in() && !$enable_for_guests) {
-            return false;
-        }
-
         $user = wp_get_current_user();
         $user_roles = $user && $user->roles ? $user->roles : array('guest');
         if (array_intersect($user_roles, (array) $this->options['excluded_roles'])) {
@@ -167,6 +162,10 @@ class LELMS_Copyright {
             return false;
         }
 
+        if (!is_user_logged_in()) {
+            return $this->options['enable_for_guests'] === 'yes';
+        }
+
         return true;
     }
 
@@ -175,12 +174,16 @@ class LELMS_Copyright {
             return false;
         }
 
+        if ($this->options['watermark_type'] === 'none' && $this->options['enable_custom_watermark'] !== 'yes') {
+            return false;
+        }
+
         $is_guest = !is_user_logged_in();
         if ($is_guest) {
             return $this->options['enable_for_guests'] === 'yes' && $this->options['enable_guest_custom_watermark'] === 'yes';
-        } else {
-            return true;
         }
+        
+        return true;
     }
 
     public function add_watermark_container() {
@@ -222,6 +225,7 @@ class LELMS_Copyright {
                 'type' => 'select',
                 'description' => __('Choose the type of watermark to display for logged-in users (overridden by custom watermark if enabled).', 'lelms-copyright'),
                 'options' => array(
+                    'none' => __('No Watermark', 'lelms-copyright'),
                     'username' => __('Username', 'lelms-copyright'),
                     'nickname' => __('Nickname', 'lelms-copyright'),
                     'email' => __('Email', 'lelms-copyright'),
@@ -412,7 +416,7 @@ class LELMS_Copyright {
                     </div>
                     <div id="about-tab" class="lelms-tab-content" style="display: none;">
                         <h3><?php esc_html_e('How to Use LeLMS Copyright', 'lelms-copyright'); ?></h3>
-                        <p><?php esc_html_e('This plugin adds a watermark and protection features to your WordPress site. Here’s how to configure it:', 'lelms-copyright'); ?></p>
+                        <p><?php esc_html_e('This plugin adds a watermark and protection features to your WordPress site. Here\'s how to configure it:', 'lelms-copyright'); ?></p>
                         <ul style="list-style: decimal; padding-left: 2em;">
                             <li><?php esc_html_e('Watermark Settings: Adjust opacity, size, spacing, color, and angle.', 'lelms-copyright'); ?></li>
                             <li><?php esc_html_e('Protection Features: Enable options to block DevTools, printing, and copying.', 'lelms-copyright'); ?></li>
@@ -564,6 +568,9 @@ class LELMS_Copyright {
                         $watermark_text = !empty($this->options['custom_watermark_text']) ? $this->options['custom_watermark_text'] : 'LeLMS Copyright';
                     } else {
                         switch ($this->options['watermark_type']) {
+                            case 'none':
+                                $watermark_text = '';
+                                break;
                             case 'username':
                                 $watermark_text = $user ? '@' . $user->user_login : '';
                                 break;
@@ -629,4 +636,4 @@ $lelmsUpdateChecker = PucFactory::buildUpdateChecker(
     'https://updates.weixiaoduo.com/lelms-copyright.json',
     __FILE__,
     'lelms-copyright'
-);
+);
\ No newline at end of file