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System for controlling access to broadcast transmissions 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H04L-009/32
  • H04L-009/08
  • H04N-007/167
출원번호 US-0119734 (1993-09-10)
발명자 / 주소
  • Cohen Michael (Jerusalem ILX) Hashkes Jonathan (Jerusalem ILX)
출원인 / 주소
  • News Data Security Products Ltd. (Quarry Bay HKX 03)
인용정보 피인용 횟수 : 116  인용 특허 : 0

초록 ▼

A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast a

대표청구항 ▼

A system for controlling access to broadcast transmissions comprising: a transmitter having a transmission scrambler for scrambling a broadcast and a satellite in geosynchronous orbit for relaying said broadcast; a security computer coupled to said transmitter; and a multiplicity of subscriber recei

이 특허를 인용한 특허 (116)

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