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This document specifies requirements and procedures to achieve and maintain protection of data and sensitive information related to mechanical Master Key Systems and other mechanical key systems where customer or application related data are being processed throughout the process of planning, production, installation, and maintenance. The requirements and test methods for mechanical cylinder locks is covered by EN 1303. Reference is made to EN 1303 and Annexes relating to Master Key Systems (MKS). Requirements relating to the information security of key based and non-key based electronic cylinders are not covered.