I created a book for someone and sent a PDF of it. I secured it with a password so it can be printed but not edited or copy/paste compatible. When I open the PDF on Acrobat on my PC, its locks me out as it should. I sent to friend and of course its the same way on Acrobat on his Mac. But when he opened it in "Preview" on the Mac, it lets him copy paste. He said he is using OSX Lion 10.7.4.
Why is Mac's viewer bypassing the security and how can I keep it from doing this?