Php/Pdf application

I am wondering if one or more of you can point me in the right direction on this one. Our company has intellectual property (legal forms) that is in the form of a pdf. We want to sell this over the Web but a regular pdf is not secure and it would allow users to make unlimited copies and have unlimited use. I know Adobe gives you the ability to assign a password to a PDF so it cannot be altered but I don't think this will suffice. We need to either: 1. Let the user print the PDF from the browser without displaying it to the screen (not sure this is feasible) or 2. Do a server side "mail-merge" without using Acrobat form fields. Just looking for a pointer in the right direction. Thanks in advance for any and all help