diff --git a/public/static/pdf/web/viewer.html b/public/static/pdf/web/viewer.html
index b1c8711e5..ccb2ac463 100644
--- a/public/static/pdf/web/viewer.html
+++ b/public/static/pdf/web/viewer.html
@@ -36,7 +36,15 @@ See https://github.com/adobe-type-tools/cmap-resources
   <script src="viewer.js"></script>
   </head>
 
-  <body tabindex="1">
+  <body tabindex="1"
+        leftmargin="0"
+        οncοntextmenu="return false"
+        οndragstart="return false"
+        onselectstart="return false"
+        οnselect="document.selection.empty()"
+        οncοpy="document.selection.empty()"
+        onbeforecopy="return false"
+        οnmοuseup="document.selection.empty()">
     <div id="outerContainer">
 
       <div id="sidebarContainer">
diff --git a/public/static/pdf/web/viewer.js b/public/static/pdf/web/viewer.js
index b81ad686c..b9da437b7 100644
--- a/public/static/pdf/web/viewer.js
+++ b/public/static/pdf/web/viewer.js
@@ -10639,7 +10639,7 @@ class PDFPageView {
       watermark_x_space: 40,//水印x轴间隔
       watermark_y_space: 50,//水印y轴间隔
       watermark_color: 'rgba(232,232,240)',//水印字体颜色
-      watermark_alpha: 0.4,//水印透明度
+      watermark_alpha: 0.6,//水印透明度
       watermark_fontsize: '40px',//水印字体大小
       watermark_font: '微软雅黑',//水印字体
       watermark_width: 120,//水印宽度
