US6473560B1
Expired / Lapsed
US
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Copy protection schemes for copy protected digital material
Assignee: Koninklijke Philips NV
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Filing: 1999-03-18
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Granted: 2002-10-29
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Expires: 2019-03-18
Abstract
Abstract Recent copy-protection schemes for digital video copy-protection rely on a pixel-watermark together with the presence of a ‘ticket’ to implement the ‘copy-once’ state of content. This ticket is designed to entitle the owner of a disk/tape to making one copy of digital content. We disclose a method to pass along this ticket with the video signal after content has been converted to the analog domain. This form of the ticket is called the analog ticket. The analog signal may be recorded on a legacy device that does not comply with the copy-protection scheme (e.g. ordinary VCRs). The analog ticket is designed such that it is automatically removed in these legacy devices. Next generation copies by compliant devices are made impossible. Three possible ways of embedding the ticket signal into the analog video signal are proposed.
Inventors
- 👤 Johan P. M. G. Linnartz
- 👤 Johan C. Talstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:56
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N2005/91307; H04N2005/91314; H04N2005/91321; H04N2005/91328; H04N2005/91335
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
129 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by adding an amplitude modulated signal with a predetermined carrier frequency in said one or more lines, a bit in the ticket signal of a first binary value being represented by a first predetermined amplitude in the amplitude modulated signal, a bit in the ticket signal of a second binary value being represented by a second predetermined amplitude in the amplitude modulated signal.
Claim 2
Dependent Claim
129 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by adding an amplitude modulated signal with a predetermined carrier frequency in said one or more lines, a bit in the ticket signal of a first binary value being represented by a first predetermined amplitude in the amplitude modulated signal, a bit in the ticket signal of a second binary value being represented by a second predetermined amplitude in the amplitude modulated signal.
Claim 3
Dependent Claim
22 words
Apparatus as claimed in claim 1 , characterized in that the predetermined carrier frequency has a value between 3 and 4 MHz.
Claim 4
Dependent Claim
50 words
Apparatus as claimed in claim 1 , characterized in that the first predetermined amplitude is substantially equal to 200% peak-peak and the second predetermined amplitude is substantially equal to 160% peak-peak, where 100% peak-peak is equivalent to the value distance between blanking level and peak white in the luminance signal.
Claim 5
Dependent Claim
152 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by changing the phase of the colour bursts in one of two subsequent lines in the video signal, a bit in the ticket signal of a first binary value being represented by the colour burst in the first one of the two subsequent lines in the video signal being changed in phase, a bit in the ticket signal of a second binary value being represented by the colour burst in the second one of the two subsequent lines in the video signal being changed in phase.
Claim 6
Dependent Claim
152 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by changing the phase of the colour bursts in one of two subsequent lines in the video signal, a bit in the ticket signal of a first binary value being represented by the colour burst in the first one of the two subsequent lines in the video signal being changed in phase, a bit in the ticket signal of a second binary value being represented by the colour burst in the second one of the two subsequent lines in the video signal being changed in phase.
Claim 7
Dependent Claim
26 words
Apparatus as claimed in claim 4 , characterized in that the means for embedding is adapted to change the phase of the colour burst over 180°.
Claim 8
Dependent Claim
144 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by adding a predetermined carrier frequency that is phase modulated with the bits in the ticket signal in the one or more lines of the analog video signal, a bit of the ticket signal of a first binary value being represented by the carrier frequency being phase modulated by a first phase angle, a bit of the ticket signal of a second binary value being represented by the carrier frequency being phase modulated by a second phase angle.
Claim 9
Dependent Claim
144 words
Apparatus for embedding a ticket signal in one or more lines of an analog video signal, the apparatus comprising first input means for receiving the analog video signal, second input means for receiving the ticket signal, means for embedding the ticket signal into the one or more lines of the video signal, characterized in that the means for embedding is adapted to embed the ticket signal by adding a predetermined carrier frequency that is phase modulated with the bits in the ticket signal in the one or more lines of the analog video signal, a bit of the ticket signal of a first binary value being represented by the carrier frequency being phase modulated by a first phase angle, a bit of the ticket signal of a second binary value being represented by the carrier frequency being phase modulated by a second phase angle.
Claim 10
Dependent Claim
22 words
Apparatus as claimed in claim 6 , characterized in that the predetermined carrier frequency is substantially equal to the colour subcarrier frequency.
Claim 11
Dependent Claim
27 words
Apparatus as claimed in claim 6 , characterized in that the said first phase angle substantially equals 0° and the said second phase angle substantially equals 90°.
Claim 12
Dependent Claim
34 words
Apparatus as claimed in claim 6 , characterized in that the means for embedding is adapted to add the ticket signal to one or more lines of even frames in the video signal only.
Claim 13
Dependent Claim
38 words
Apparatus as claimed in claim 6 , characterized in that the means for embedding is adapted to invert the ticket signal embedded in every m-th frame in the video signal, where m is an integer equal to 2.
Claim 14
Dependent Claim
44 words
Apparatus as claimed in claim 6 , characterized in that the means for embedding is adapted to invert the ticket signal embedded in the (2+m)-th frame of the video signal, where m is an integer equal to 0, 4, 8, 12, . . .
Claim 15
Dependent Claim
28 words
Apparatus as claimed in claim 1 , characterized in that the said one or more lines are lines included in the vertical blanking intervals of the video signal.
Claim 16
Dependent Claim
30 words
Apparatus as claimed in claim 1 , characterized in that the said one or more lines are lines in the overscan portion of the active lines in the video signal.
Claim 17
Dependent Claim
29 words
Apparatus as claimed in claim 1 , characterized in that it further comprises write means for writing the video signal with the embedded ticket signal on a record carrier.
Claim 18
Dependent Claim
27 words
Method of embedding a ticket signal in one or more lines of an analog video signal, carried out in the apparatus as claimed in claim 1 .
Claim 19
Dependent Claim
30 words
Method as claimed in claim 15 , characterized in that it further comprises the step of recording the the video signal with the embedded ticket signal on a record carrier.
Claim 20
Dependent Claim
22 words
Record carrier obtained with the method of claim 16 , having the video signal with the embedded ticket signal recorded on it.
Claim 21
Dependent Claim
18 words
Analog video signal obtained with the method of claim 15 , having the ticket signal embedded in it.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-10-28 | 2006-04-29 | 2006-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-28 | 2010-04-29 | 2010-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-10-28 | 2014-04-29 | 2014-10-29 | $7700.00 | Window Closed / Lapsed |