a locking key ring for supporting keys and for preventing the unauthorized removal and duplication of the keys . the locking key ring carries identification and instructions to contact the identified party prior to copying the keys thereby reducing the risk of unauthorized duplication . the locking key ring comprises a cylinder lock assembly adapted to receive a shackle in the form of a key ring . removal of the keys from the key ring is not permitted unless the lock cylinder releases the key ring . this is accomplished through use of an operating key which matingly engages the lock cylinder . the cylinder housing carries identifying inscription and instructions for a locksmith to receive authorization prior to making copies of the keys .