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There are no restrictions on the passwords you use with regards to length, characters or numbers, but passwords are case-sensitive.It might be a good idea to keep a copy of your password in a safe place or create a strong password that you’ll remember. IT can’t retrieve forgotten passwords.

Your options vary depending on the type of password security attached to the document:.You can remove security from an open PDF if you have the permissions to do so. At the prompt to confirm the password, retype the appropriate password in the box and click Use this option to create security envelopes. Users can open the document without a password. Requires a password to open file attachments. Encrypt All Document Contents Except MetadataĮncrypts the contents of a document but still allows search engines access to the document metadata.If this option is selected, search engines cannot access the document metadata. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X and Later.Įncrypts the document and the document metadata. Acrobat X And Later (PDF 1.7) encrypts the document using 256-bit AES.Acrobat 7.0 And Later (PDF 1.6) encrypts the document using the AES encryption algorithm with a 128-bit key size.Acrobat 6.0 And Later (PDF 1.5) encrypts the document using 128-bit RC4.For example, Acrobat 7 cannot open a PDF encrypted for Acrobat X and later. It is important to choose a version compatible with the recipient's version of Acrobat or Reader. Options control compatibility with previous versions and type of encryptionĬompatibility option you choose determines the type of encryption used.