pdfcrypt 

pdfcrypt allows you to encrypt a PDF (40 bits and 128 bits), set permissions, add user and owner password. For example you can encrypt a pdf without to allow to print it. The button to print the file will be disabled in Acrobat Reader application.
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Encrypt PDF SDK-COM Component 

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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Encrypt PDF 

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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Encrypt PDF Command Line 

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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CHAOS For Security 

Encrypt and compress individual files and folders.
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FileVault 

Secure your images, movies, passwords etc. in fact any file or files. Securely delete files & leave no trace. Files will be undetectable even by software forensics applications. Also protect and encrypt your Internet Favourites.
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