1)   Encrypt PDF Command Line 2.31
Encrypt PDF Command Line helps you encrypt PDF by Command Line. With this software, you can protect your PDF files.
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 2)   Encrypt PDF (Secure PDF) 2.3
Encrypt PDF software allows you to encrypt (using standard 40-bit or 128-bit supported by Acrobat Reader 5.0 and up) existing PDFs.
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 3)   Encrypt PDF SDK-COM Component 2.1
Encrypt PDF SDK-COM allows you to encrypt (using standard 40-bit or 128-bit supported by Acrobat Reader 5.0 and up) existing PDFs.
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