System and method for controlling display of copy-never content
First Claim
1. A method for preventing normal display of a received video signal that is not authorized for use at a display device, comprising:
- receiving a video signal at a display device;
determining whether a secure timestamp is associated with the video signal;
calculating a transmission time lag by determining a difference between a time indicated by the secure timestamp and a time the video signal is first received by the display device; and
preventing normal display of the video signal by the display device if the transmission time lag exceeds a defined maximum lag period, and displaying the video signal as a video image on the display device if the transmission time lag does not exceed the maximum lag period.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for controlling the use of unauthorized content, and specifically for controlling the display of content that is marked as “copy-never.” A compliant signal source transmits a video signal along with a secure timestamp to a compliant display device. The compliant display device determines whether the video signal is authorized to be displayed by determining the content management usage rights status in the video signal and the delay between when the video signal was transmitted and when it was received. In an embodiment of the invention, copy-never content that exceeds a defined delay between transmission and reception is prevented from being displayed.
95 Citations
36 Claims
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1. A method for preventing normal display of a received video signal that is not authorized for use at a display device, comprising:
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receiving a video signal at a display device; determining whether a secure timestamp is associated with the video signal; calculating a transmission time lag by determining a difference between a time indicated by the secure timestamp and a time the video signal is first received by the display device; and preventing normal display of the video signal by the display device if the transmission time lag exceeds a defined maximum lag period, and displaying the video signal as a video image on the display device if the transmission time lag does not exceed the maximum lag period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for preventing normal display of a received video signal that is not authorized for use at a display device, comprising:
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at least one signal source configured to output a video signal to a network, wherein the signal source associates the video signal with a secure timestamp indicating a time when transmission of the video signal is initiated; and at least one display device operatively connected to the network and configured to receive the video signal, the display device comprising a detector for detecting the secure timestamp associated with the video signal and a comparator for comparing the secure timestamp with a time at which the video signal is first received by the display device, wherein the display device prevents the normal display of the video signal if the difference between the time the video signal is first received by the display device and the time indicated by the secure timestamp is greater than or equal to a defined maximum, and if the difference is less than the defined maximum, displays a video image using the video signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for circumventing a copy-protection system for preventing normal display of a video signal, wherein the copy-protection system associates a timestamp with the video signal and prevents normal display of the video signal if the time between the transmission of the video signal from a compliant source device and the reception of the video signal at a compliant display device exceeds a defined maximum, the method comprising:
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receiving the video signal from the compliant source device, the video signal originating from a source device providing protected content of the copy-protection system and including a secure timestamp indicating a first time that the video signal originated from the source device and an indicator of the copy-protection system indicating that display of the protected content is restricted after elapse of a defined lag period beginning with the first time; and processing the received video signal to provide an altered video signal, wherein the altered video signal comprises the received video signal excluding the secure timestamp and a replacement timestamp indicating a second time, the second time being later than the first time, and the replacement timestamp replacing the secure timestamp in the received video signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A system for circumventing a copy-protection system for preventing normal display of a video signal, wherein the copy-protection system associates a timestamp with the video signal and prevents normal display of the video signal if the time between the transmission of the video signal from a compliant source device and the reception of the video signal at a compliant display device exceeds a defined maximum, the system comprising:
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a computer operatively associated with a memory, the memory holding programmed instructions comprising; receiving the video signal from the compliant source device, the video signal originating from a source device providing protected content of the copy-protection system and including a secure timestamp indicating a first time that the video signal originated from the source device and an indicator of the copy-protection system indicating that display of the protected content is restricted after elapse of a defined lag period beginning with the first time; and processing the received video signal to provide an altered video signal, wherein the altered video signal comprises the received video signal excluding the secure timestamp and a replacement timestamp indicating a second time, the second time being later than the first time, and the replacement timestamp replacing the secure timestamp in the received video signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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Specification