This European Standard specifies requirements for high security locks (HSL) for reliability, resistance to burglary and unauthorized opening with methods of testing. It also provides a scheme for classifying HSL in accordance with their assessed resistance to burglary and unauthorized opening.
It applies to mechanical and electronic HSL. The following features may be included as optional subjects but they are not mandatory:
a) recognized code for preventing code altering and/or enabling/disabling parallel codes;