Windows only: Freeware PDF Unlocker, a free Windows utility, doesn't do everything that commerical packages like those from Elcomsoft do, but it will help if you just need to unlock copy/paste and editing restrictions on a PDF. Simply drag a copy-protected PDF onto PDF Unlocker's icon, and a new, non-protected copy will be created. You can also strip PDF files of passwords needed to open and read them, but you, uh, need the password to do so. For simple restrictions, however, it does the job. Freeware PDF Unlocker is a free download for Windows systems.