默认密码保护，确保用户必须修改出厂密码。

Default password protection, ensuring users to input new passwords.

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对于受密码保护的文档，在默认情况下，保存文档时将不保持对其缓存数据所做的更改。

By default, changes to cached data in a password-protected document are not persisted when the document is saved.

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