The Permission password is the master password that lets you control whether a file can be printed, edited, or copied. The security options are controlled by two passwords: the Permission password and the Open password. For more information about choosing a version, see Optimizing PDF files. For example, if you save to Adobe Reader version 6, or lower, it has standard encoding, version 8 has 128-bit encoding, and version 9 has 256-bit encoding. The encryption levels provided by Adobe Reader have increased over time. The level of security that is available is also determined by which version of Adobe Reader you use to create the PDF file. Security options let you control whether, and to what extent, a PDF file can be accessed, edited, and reproduced when viewed in Adobe Reader. You can set security options to protect PDF files that you create.
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