I just purchased Adobe Acrobat because it was recommended to password protect files.
However, when I checked out the Tools > Protection > Encrypt> "Encrypt with Password" is greyed out.
Can a file be password protected using Adobe Acrobat XI Standard?
The OS version is Windows 7.
No one seems to have answered the question in the Trending Questions.
Yes, it can. Use File > Properties, and click the Security tab. Click Change, and set what you need. When the file is saved, the security is set.
BE SURE TO KEEP THE ORIGINAL FILE TOO.