So remember that feature in OS X that allowed you to compress your PDFs. Well, it’s not really there any more. But it can still be done, as a client of mine, Bill, pointed out to me: http://www.apple.com/downloads/macosx/automator/compresspdfworkflow.html
At the office, we’ve built another Automator workflow to allow you to go ahead and password protect PDFs. So there’s a lot of flexibility here…