by SourceGuardian.com SourceGuardian is the only serious choice for protecting and encrypting your PHP source code assets. With flexibility that other products only dream of Professional developers everywhere are using SourceGuardian products to distribute their scripts.
by phpSHIELD.com phpSHIELD protects your PHP Source Code with a powerful, easy to use encoder, which creates a native bytecode version of the script and then encrypts it.