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PDF Encryption and Adobe Acrobat PDF Security guide on what document security software you should use to encrypt PDF files.

http://www.locklizard.com/pdf-encryption-security.htm

Includes news, hoax warnings, screen shots, and update bulletins on the latest computer viruses.

http://www.f-secure.com/

Computer security information clearinghouse. Includes a calendar, free tools, forums, industry news, and a library

http://www.securityfocus.com/