A rate-distortion problem for a communication system with a secondary decoder to be hindered

permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. A&rucl-A rate-distortion problem is considered for a communication system (f, &) with a secondary decoder & to be hindered which uses a different distortion measure from the primary system. The least achievable distortion of the secondary decoder is evaluated for the most secure primary system. Source coding for sources with additional outputs to be kept secret from the receiver or wiretappers is also discussed. Security is evaluated by distortion measures instead of the equivocation function used in a previous paper.