Is there compatibility between MPEG-4 IPMP hooks and IPMP eXtensions?
MPEG-4 IPMP eXtensions do not break or otherwise negatively impact existing implementations based on the original, hooks specifications. An identifier is defined in order to specify which IPMP solution is being used. MPEG-4 IPMP hooks protected content may be accessed by MPEG-4 IPMP-X terminal. MPEG-4 IPMP-X protected content will be conceived by IPMP hooks terminal as being protected by an unknown IPMP system.