Protect Document

Toggles write protection for fields and bookmarks in the document.

「保护」不是出于信息安全保护的考虑，它只是用于避免意外更改的开关。

Protect Fields

Toggles fields write protection. When checked, the fields cannot be edited or deleted.

Protect Bookmarks

Toggles bookmark write protection. When checked, the bookmarks cannot be deleted or renamed.