Thanks in advance for your help.
I am attempting to allow users of Adobe Reader to attach their own documents to a PDF such that their documents get encrypted during the attachment. I know that I can do this in Adobe Acrobat (via Security Envelopes). I can also attach files to a PDF in Reader (via comments, provided they've been enabled). Is it possible to do what I'm asking (basically create something similar to a Security Envelope in Reader)?
I know that I could encrypt the files prior to attaching them to the PDF, but we're hoping to avoid the extra step.
Thanks again for your time and your help.
I still suggest you to add open password of the PDF file using Adobe Acrobat. Adobe Reader could do nothing for you.