1)   Encrypt PDF 4.0.1.5
PDF Encrypt software is a very flexible and powerful program, it allows you to encrypt (using 40-bit, 128-bit, AES encryption) existing PDF, set permission, add user and owner password. For example you can encrypt a PDF without allowing to print it.
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 2)   Lizard Safeguard PDF Security 2.6
PDF document security with PDF DRM controls. Stop copying, sharing, modifying, screen grabbing. Control the number of views and prints & when documents expire. No useless pdf password security. Complete PDF copy protection and PDF control.
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 3)   PDF Profit Lock 1.00
Don't let your hard work slip down the drain! PDF Profit Lock lets you add password protection, self-expiring files, splash screens, exit pop-ups...even your own icons! If you don't have PDF Profit Lock, you're just throwing money down the drain!
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 4)   pdf encryption Tool 4.0.1.5
pdf encryption Tool is a an advanced and powerful program that 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 allowing
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