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US 5,418,853 AGranted
Apparatus and method for preventing unauthorized copying of video signals
AssigneeSony Corporation
InventorsKeiji Kanota, Hajime Inoue, Yukio Kubota
Life of this patent
Estimating the term…
Abstract
In a digital video tape recorder (VTR) which reproduces digital video and audio signals from a magnetic tape, a copy protect bit in the reproduced digital video signal is detected, and on the basis of the copy protect bit, a code is generated and inserted into the vertical blanking interval of the reproduced video signal. When a video signal (which may be in analog or digital form) having the code in the vertical blanking interval is received in a digital VTR, the code is detected and recording of the video signal and an associated audio signal is inhibited if the code indicates that the received video signal is copy protected.
Claims100
A method of transmitting a video signal comprising the steps of:
- forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;
- combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;
- and
- transmitting said multiplexed video signal.
1 more element
A video recording apparatus comprising:
- means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- means for receiving an audio signal associated with said multiplexed video signal;
- means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;
- means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted;
- and
- means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted.
3 more elements
A method of transmitting a video signal comprising the steps of:
- reproducing a digital video signal from a magnetic tape;
- detecting a copy guard signal that is present in said reproduced digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;
- converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval of said analog video signal;
- and
- transmitting said analog video signal.
4 more elements
A method of transmitting a video signal comprising the steps of:
- reproducing a digital video signal from a magnetic tape;
- converting said reproduced digital video signal into an analog video signal;
- receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and detecting a copy guard signal that is present in said received digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- transmitting said analog video signal having said ID signal inserted in said vertical blanking period of said analog video signal.
4 more elements
A video reproducing apparatus comprising:
- means for reproducing a digital video signal from a magnetic tape;
- means for detecting a copy guard signal that is present in said reproduced digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;
- and
- means for outputting said multiplexed digital video signal.
3 more elements
A video reproducing apparatus according to claim wherein said reproduced digital video signal is a compressed 21;
- digital video signal, and further comprising means for expanding said compressed digital video signal.
A video reproducing apparatus comprising:
- means for reproducing a digital video signal from a magnetic tape;
- means for converting said reproduced digital video signal into an analog video signal;
- means for receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and for detecting a copy guard signal that is present in said received digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- means for outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.
4 more elements
A video recording and reproducing apparatus comprising:
- means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copyright protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- means for receiving an audio signal associated with said multiplexed video signal;
- means for determining whether or not copying of said video signal is permitted based on said copyright protection bit and said category information;
- means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted;
- means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted;
- means for reproducing a digital video signal from a recording medium;
- means for detecting a copy guard signal that is present in said reproduced digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;
- and
- means for outputting said multiplexed digital video signal.
8 more elements
A video recording and reproducing apparatus comprising:
- means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- means for receiving an audio signal associated with said multiplexed video signal;
- means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;
- means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted;
- means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted;
- means for reproducing a digital video signal from a recording medium;
- means for converting said reproduced digital video signal into an analog video signal;
- means for detecting a copy guard signal that is present in said reproduced digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- means for outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.
9 more elements
A method of recording a video signal comprising the steps of:
- receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- receiving an audio signal associated with said multiplexed video signal;
- determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;
- recording the received video and audio signals if it is determined that copying of said video signal is permitted;
- and
- inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted.
3 more elements
A method of reproducing a video signal comprising the steps of:
- reproducing a digital video signal from a magnetic tape;
- detecting a copy guard signal that is present in said reproduced digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;
- and
- outputting said multiplexed digital video signal.
3 more elements
A method of reproducing a video signal comprising the steps of:
- reproducing a digital video signal from a magnetic tape;
- converting said reproduced digital video signal into an analog video signal;
- receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and detecting a copy guard signal that is present in said received digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.
4 more elements
A method of recording and reproducing a video signal, comprising the steps of:
- receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- receiving an audio signal associated with said multiplexed video signal;
- determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;
- if it is determined that copying of said video signal is permitted, recording the received video and audio signals in digital form on a recording medium, said digital form including a copy guard signal;
- inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted;
- reproducing said digital video signal from said recording medium;
- detecting said copy guard signal that is present in said reproduced digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;
- and
- outputting said multiplexed digital video signal.
8 more elements
A method of recording and reproducing a video signal, comprising the steps of:
- receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- receiving an audio signal associated with said multiplexed video signal;
- determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;
- if it is determined that copying of said video signal is permitted, recording the received video and audio signals in digital form on a recording medium, said digital form including a copy guard signal;
- inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted;
- reproducing said digital video signal from said recording medium;
- converting said reproduced digital video signal into an analog video signal;
- detecting said copy guard signal that is present in said reproduced digital video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.
9 more elements
An apparatus for transmitting a video signal, comprising:
- means for forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;
- means for combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;
- and
- means for transmitting said multiplexed video signal.
1 more element
An apparatus for transmitting a video signal, comprising:
- means for reproducing a digital video signal from a magnetic tape;
- means for detecting a copy guard signal that is present in said reproduced digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video
- means for converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval of said analog video signal;
- and
- means for transmitting said analog video signal.
4 more elements
An apparatus for transmitting a video signal, comprising:
- means for reproducing a digital video signal from a magnetic tape;
- means for converting said reproduced digital video signal into an analog video signal;
- means for receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and for detecting a copy guard signal that is present in said received digital video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said analog video signal;
- and
- means for transmitting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.
4 more elements
An apparatus for receiving a video signal, comprising:
- means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- and
- means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information.
An apparatus for receiving a video signal, comprising:
- means for receiving a video signal that includes a copy guard signal, said means for receiving including means selected from the group consisting of means for decoding a cable television signal, means for decoding a satellite broadcast television signal and means for receiving an over-the-air broadcast television signal;
- means for detecting said copy guard signal included in said received video signal;
- means for generating an ID signal in accordance with the detected copy guard signal;
- means for inserting said ID signal into a vertical blanking interval of said received video signal to form a multiplexed video signal;
- and
- means for outputting said multiplexed video signal.
3 more elements
An apparatus for transmitting and receiving a video signal, comprising:
- means for forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;
- means for combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;
- means for transmitting said multiplexed video signal;
- means for receiving said multiplexed video signal which was transmitted by said means for transmitting;
- and
- means for determining whether or not copying of said received video signal is permitted based on said copy protection bit and said category information contained in said vertical blanking interval of said received video signal.
3 more elements
A method of receiving a video signal comprising the steps of:
- receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;
- and
- determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information.
A method of receiving a video signal comprising the steps of:
- receiving a video signal that includes a copy guard signal, said receiving step including a step selected from the group consisting of decoding a cable television signal, decoding a satellite broadcast television signal, and receiving an over-the-air broadcast television signal;
- detecting said copy guard signal included in said received video signal;
- generating an ID signal in accordance with the detected copy guard signal;
- inserting said ID signal into a vertical blanking period of said received video signal to form a multiplexed video signal;
- and
- outputting said multiplexed video signal.
3 more elements
A method of transmitting and receiving a video signal comprising the steps of:
- forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;
- combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;
- transmitting said multiplexed video signal;
- receiving said transmitted multiplexed video signal;
- and
- determining whether or not copying of said received video signal is permitted based on said copy protection bit and said category information contained in said vertical blanking interval of said received video signal.
3 more elements
Dependencies are inferred from the claim text.