×

Process for the broadcasting of conditional access programs permitting a progressive access to such programs

  • US 5,442,701 A
  • Filed: 12/27/1993
  • Issued: 08/15/1995
  • Est. Priority Date: 12/29/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of broadcasting conditional access programs, comprising the steps of:

  • (a) scrambling data representing a content of at least conditional access program; and

    (b) transmitting such scrambled data along with partial access checking messages and complete access checking messages to subscribers, said partial access checking messages permitting said subscribers to descramble portions of said scrambled data corresponding to information regarding only the identity of said at least one conditional access program, and said complete access checking messages permitting authorized subscribers to descramble a remainder of said scrambled data and view said at least one conditional access program.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×