VERFAHREN ZUR AUSSENDUNG VON PROGRAMMEN MIT BEDINGTEM ABER PROGRESSIVEM ZUGANG UND VERFAHREN FÜR PROGRESSIVEN ZUGANG ZU SOLCHEN PROGRAMMEN

摘要

A process for broadcasting conditional access programs which permits a progressive access. Scrambled program data is transmitted along with partial access checking messages and complete access checking messages such that subscribers having a partial access right may descramble portions of the scrambled data corresponding to information regarding only the identity of the conditional access programs, and subscribers having a complete access right may descramble the remainder of the scrambled data and view the conditional access programs. The conditional access programs may be television pictures, radio programs, or data broadcasts.