I have Adobe XI. Trying to figure out how to password protect a document. Neither the properties tab nor tools tabs give me a drop down to password protect. The properties tab security says, this document's security method restricts what can be done to the document. Then it says "no security" under the security method. How do I do this?
Do you use Adobe Reader XI or Adobe Acrobat XI ?
You can encrypt only in Acrobat but not in Reader.
+ does your PDF contain digital signatures? You cannot encrypt already signed PDF. You need to encrypt first before you apply the first signature.