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Chapter 42. Working in a PDF in Acrobat > Understanding Security and Digital ID...

Understanding Security and Digital IDs

Acrobat provides you with a way to verify that a peer has indeed read a document and approved it. This is especially important when confidentiality is an issue.

Using Passwords

To add security to a PDF file, Acrobat enables you to add two types of passwords so that only authorized persons can view and/or edit its contents. Passwords are stored inside the PDF itself and encoded with 128-bit encryption. Files protected with a Open Password prompt a dialog asking for the password to be typed. If the correct password is not entered, the document is not opened. Documents protected with a Permissions password can't be edited or printed unless the password is entered. There are several levels of Permissions password protection. You may choose to lock the entire document or to allow unauthorized users to view it but not to save attached files. You can make a document unprintable. Or you can make a document viewable but unchangeable, meaning no editing is allowed, including comments. You decide the level of protection you want in your file.


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