G - Physics – 11 – B
Patent
G - Physics
11
B
352/10.5
G11B 5/008 (2006.01) G06F 21/00 (2006.01) G11B 7/28 (2006.01) G11B 15/00 (2006.01) G11B 20/00 (2006.01) G11B 27/031 (2006.01) G11B 27/034 (2006.01) G11B 27/30 (2006.01) G06F 1/00 (2006.01) G11B 27/032 (2006.01)
Patent
CA 2025644
Record carrier, method of and information recording device for obtaining such record carriers, and information recording device comprising anti-copy means to inhibit unauthorized copying. A record carrier is disclosed carrying subcode information in addition to the main information. The subcode information comprises "copy" bits of alternating logic values (Figs. 3 and 4) to indicate that the recorded information is a copy. Moreover, a method and recording device (Fig. 5, 72) for obtaining such record carriers are described. Finally, a recording device (71; 72) is described, which comprises a detection circuit (85) which detects the presence of "copy" bits of alternating logic values in the received information, and which comprises a decision circuit (94; 95) for deciding whether recording of the received information is allowed depending upon the detection of the presence of the "copy" bits of alternating logic values.
Petrus Josephus Heemskerk Jacobus
Roth Rudolf
Veldhuis Hindrik
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
N.v. Philips Gloeilampenfabrieken
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