Keying Platforms Lockwood restricted master keying solutions provide high security with added convenience. Lockwood MT5 Restricted Keying SystemHigh security restricted keying system. Lockwood GEN6T®An evolution of Lockwood’s proven Generation Six platform. We recommend prior to purchasing a Masterkey System that you review both our Master Key Design Guide and Key Control Design Guides and most importantly ensure you have a SIPA agreement in place with your Authorised Service Agent. SIPA™ Agreement Download the SIPA Agreement Master Key System Design Guide To ensure a facility or building has the desired level of security. Click to download Key Control Design Guide Increase the Safety and Security of Your Facility. Click to download Key Blanks Catalogue Click to download