"Set Passwords and Information to PDF" can set User/Owner passwords and Title/Subject/Keyword/Author/Creator information to PDF file. It contains the command line tool 'pdfauxinfo' and 'Add Auxiliary Info to PDF' Automator action, and therefore it's for Mac OS X. Automator action uses command line internally. This is the version 2 set for Mac OS X Leopard.
What's new in this version:
- Compatible for Mac OS X Leopard.
- New options are subject, keyword, 128 bit encryption.
. Follow the link and free download Set Passwords and Information to PDF