Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent
2006-10-03
2006-10-03
Cangialosi, Salvatore (Department: 3621)
Cryptography
Video cryptography
Copy protection or prevention
C380S228000
Reissue Patent
active
RE039319
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 bitdelete-start id="DEL-S-00001" date="20061003" ?stream:delete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20061003" ?stream;insert-end id="INS-S-00001" ?(b) decrypting and transmitting the bit stream to which the header area isdelete-start id="DEL-S-00002" date="20061003" ?added:delete-end id="DEL-S-00002" ?insert-start id="INS-S-00002" date="20061003" ?added;insert-end id="INS-S-00002" ?(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 fromdelete-start id="DEL-S-00003" date="20061003" ?stopdelete-end id="DEL-S-00003" ?insert-start id="INS-S-00003" date="20061003" ?stepinsert-end id="INS-S-00003" ?(c) andinsert-start id="INS-S-00004" date="20061003" ?optionallyinsert-end id="INS-S-00004" ?recording itdelete-start id="DEL-S-00004" date="20061003" ?andelete-end id="DEL-S-00004" ?insert-start id="INS-S-00005" date="20061003" ?on ainsert-end id="INS-S-00005" ?tape.
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Birch & Stewart Kolasch & Birch, LLP
Cangialosi Salvatore
LG Electronics Inc.
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