Public Key File and Email Encryption freeware 

DeltaCrypt OneClick Personal: Public Key File, Email Encryption featuring 1024-bit RSA protection, digital signatures, unalterable public keys to keep files of any format and email communications secured. Ideal laptop protection. Personal use only.
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SignetSure 

SignetSure is Win32 security tool for protecting files from hacker alteration. Create digital signatures for your files from Win32 app. Then authenticate your files with single API call. Uses RSA public key cryptography. C/C++ or Visual Basic.
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Puffer 

Data file and e-mail encryption utility for Win 95 to XP. Uses 2048-bit Diffie-Hellman public key encryption with 256-bit AES algorithm for symmetric encryption.
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Infralution Licensing System 

Infralution Licensing System (ILS) is an affordable, 100% .NET solution for licensing components and applications using simple and secure encrypted license keys.
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SDProtector Pro 

SDProtector is a powerful tool offering both software developers and distributors a protection of software products against unauthorized copying, use and distribution.With SDProtector,it's easy to turn your application in "try-before-you-buy" version
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Chilkat Digital Certificates Component 

Chilkat Certificate makes it easy to get information about the security certificates that are stored on your computer. It also allows you to easily add certificates to a certificate store, remove certificates from a store, or find a certificate that
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