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Designed to prevent unauthorized copying of computer programs, Securikey is offered by Software Security Systems, Inc. Securikey is a small, straight or L-shaped device that must be inserted into the computer prior to accessing the program. According to the company, Securikey is transparent to unprotected operations, including diagnostics. The degree. and depth of security checking is specified by the software manufacturer. Two methods, usable together or separately, may be utilized: logic sequence or serial number checking.