ap PDF Encrypt 3.0
PDF Encrypt software is a very flexible and powerful program, PDF Encrypt software allows you to encrypt (using standard 40-bit or 128-bit or AES encryption ) existing PDFs, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it.

PDF Encrypt COM/SDK 3.0
PDF Encrypt software is a very flexible and powerful program, PDF Encrypt software allows you to encrypt (using standard 40-bit or 128-bit or AES encryption ) existing PDFs, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it.

PDF Encrypt COM/SDK Unlimited License 3.0
PDF Encrypt software is a very flexible and powerful program, PDF Encrypt software allows you to encrypt (using standard 40-bit or 128-bit or AES encryption ) existing PDFs, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it.

LockLizard Safeguard PDF Security 2.6.29
PDF document security software with US Government strength encryption and DRM digital rights management controls. Control who can view your PDF documents and how they are used. Stop copying, sharing, modifying, and screen grabbing. Control the number of views and prints or disallow printing altogether. Control when documents expire and instantly revoke them. No useless pdf password security. Complete PDF copy protection and PDF control.