Patente USRE42922 - Copy prevention method and apparatus for digital video system

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Primary Examiner * Pierre E Elisca (74) Attorney, Agent, or Firm * Birch, Stewart, Kolasch & Birch, LLP

(57) ABSTRACT

A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: (b) decrypting and transmitting the bit stream to which the header area is added: (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop (c) and recording it an tape.

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’ ’ atanabe et a1’ Publishing Co., Inc., 59 pages, 1979.

2 1SAt§afiIl1(d€;ta1' """""""""" " 705/54 ISO/IEC 13818-1, “Information TechnologyiGeneric Coding of 5’646’992 A 7/1997 Subler et 31 Moving Pictures andAssociatedAudio: Systems” International Stan5’659’6l3 A 8/1997 C 1 d ' 1 dardNov. 13, 1994, 1-144 (all pages).

’ ’ 0.pe an eta‘ ISO/IEC 13818-2, “Information TechnologyiGeneric Coding of 5 ’673’357 A 9/1997 Shlma Moving Pictures and Associated Audio Information Video”, Interna5,689,559 A U/1997 Park tional Standard, 1995, pp. 1-243 (all pages).

5,689,561 A 11/1997 Pace
5,703,859 A 12/1997 Tahara et al. * cited by examiner

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Copy prevention method and apparatus for digital video system