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5. Manipulating PDF Files > 52. Encrypt and Decrypt PDF (Even Without Acrobat)

Encrypt and Decrypt PDF (Even Without Acrobat)

Restrict who can view your PDF and how they can use it.

You can use PDF encryption to lock a file’s content behind a password, but more often it is used to enforce lighter restrictions imposed by the author. For example, the author might permit printing pages but prohibit making changes to the document. Here, we continue from [Hack #2] and explain how pdftk [Hack #79] can encrypt and decrypt PDF documents. We’ll begin by describing the Acrobat Standard Security model (called Password Security in Acrobat 6) and the permissions you can grant or revoke.

Tip

PDF file attachments get encrypted, too. After opening an encrypted PDF, document file attachments can be opened, changed, or deleted only if the owner granted ModifyAnnotations permission.


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