偶尔我们下载文件时候会遇到加密，这时候只需要暴力解锁，就可以看到里面的内容了。

Use this site to remove passwords and restrictions (such as printing, copying text, etc.) from PDFs

使用此站点可从 PDF 中删除密码和限制（例如打印、复制文本等）。

Note: This only works for PDFs that you can open and read without any 3rd party plugins. PDFs that require a password to be viewed cannot be unlocked by this service. This is because this is not cracking. Viewable PDFs with restrictions are not really protected, no more than a door with a broken lock, as opposed to password-protected PDFs.

注意：这仅适用于您可以在没有任何第三方插件的情况下打开和阅读的 PDF。需要密码才能查看的 PDF 无法通过此服务解锁。这是因为这不是破解。与受密码保护的 PDF 相比，具有限制的可查看 PDF 并没有真正受到保护，就像一扇锁坏了的门一样。