Is it possible to create a password for a file on Adobe Reader X?
migrated from stackoverflow.com Jun 17 '11 at 9:15
See this video..
A lot depends on what version of Acrobat you are using.
On Acrobat 8 Pro, you select File->Properties and under Security tab,
select Security Method from dropdown list to be "Password Security." A new
dialog opens that allows you to determine the options as to what will be
secure regarding the document: does it require a password just to open it?
With other (earlier) versions of Acrobat, the command for setting passord is still under the File menu (it might read Document Properties or Document Security) and the interface is basically the same with respect to setting options.
As other's have said, you cannot password protect with Adobe Reader. However, programs such as PrimoPDF (Freeware) can do this for you.
I was also struggling to find an option to password-protect my PDF document with free Adobe Reader. Now I know that it is only possible with Adobe Acrobat pro that costs $199.
Finally I'm settled with a software called PDF encrypt (http://www.mypdfsolutions.com/pdf-encrypt-tool.html). It can be used to lock PDF files with owner and user password. Pretty cheap and effective!