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Just a reminder to all (from someone who has developed an independent PDF generator): if you're using PDFs for their security/permissions, realize that the master password is far from secure.
When you set permissions on a PDF, you choose a master password. This password is required to change the permissions. This password is not used to encrypt the document. This means that while you may have created a document with permissions not allowing the user to copy and paste from the document, etc., it's still not tough to do.
If you are looking to encrypt the document to achieve much better security, enable the user password as well. This encrypts everything in the document.
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