Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
2000-08-01
2001-09-25
Chevalier, Robert (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06295407
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method for protecting digital data from unauthorized mass duplication. More specifically, this invention relates to a method for copy protecting digital video signals recorded on a storage medium, such as a compact disc.
The recent development of consumer electronics incorporating devices for the reproduction of digitally-recorded audio and video data has resulted in the corresponding development of a vast consumer market for digitally-recorded media. Such digitally-recorded media are available in a number of different forms, including optical disc, magnetic disc, magneto-optical disc, magnetic tape, cartridge, and the like. Commonly, many of these forms of digitally-recorded media are available for sale or rental. Additionally, consumers may access and retrieve for storage digital audio and video data from cable systems, computer networks, satellite transmission systems, and the like.
Generally, prerecorded digital media contain a complete and virtually error-free duplicate of original data reproduced from an original digital master recording. As is well known in the art, digital data stored on a prerecorded digital medium may be reproduced many times without significantly affecting the quality of the stored data. Hence, a prerecorded digital medium may itself be utilized as a template from which many additional copies of digital data may be reproduced and recorded on other digital media.
The ease with which such reproduction and recording operations may occur and the high quality of the resulting recordings has facilitated the development of significant efforts to produce and distribute counterfeit prerecorded digital media. Although counterfeiting may occur in small volumes through the use of consumer recording/reproducing devices, a more significant problem has arisen from the use of mass production recording devices. In the optical disc industry, optical discs are mass produced with a formatting device, termed a “formatter”, which reproduces digital data from a master recording and records the reproduced data onto an “original” disc. A stamping template, “stamper”, is made from this “original” disc. The “stamper” thus created, may then be used to produce large numbers of optical discs, e.g. ROM discs, bearing the original digital data. Hereinbelow, the mass produced optical discs will be referred to as “retail discs.”
At present, it is difficult, if not impossible, for an optical disc producer to determine the authenticity of or legal title to a particular master version of digital data provided by a third party. For example, a counterfeiter may bring an illegally obtained master recording, “original” disc, or “stamper”, or even a retail disc, to an optical disc producer for mass reproduction of the recorded digital data. Unable to verify the authenticity of or legal title to the digital data supplied by the counterfeiter, the optical disc producer may unwittingly mass produce optical discs bearing the counterfeiter's digital data. Such counterfeit optical discs have the potential to be indistinguishable from retail discs produced under proper authority from legal master recordings.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the present invention is to provide apparatus for authenticating a digital recording prior to mass duplication of the recording.
Another object of the present invention is to provide formatting apparatus for determining the authenticity of a digital recording prior to mass duplication of the recording.
Still another object of the present invention is to provide formatting apparatus for inhibiting the mass duplication of a digital recording purchased at retail.
Yet another object of the present invention its to imbed security data into a digital recording to prevent mass duplication of that recording.
In accordance with an aspect of the present invention, a formatting device for the authentication and mass duplication of an information signal recorded on a storage medium is provided. The device includes a first receiving device for receiving the information signal and a second receiving device for receiving a key signal. A key signal detection device, analyzes the information signal to detect the key signal in the information signal. A key insertion device, inserts the key signal into the information signal to produce a modified information signal. A recording device records the modified information signal if the key signal is not detected in the information signal and inhibits the recording of the modified information signal if the key signal is detected in the information signal.
According to another aspect of the present invention, a method for the authentication and mass duplication of an information signal recorded on a storage medium is provided. The method includes the steps of: receiving the information signal; receiving a key signal; analyzing the information signal to detect the key signal in the information signal; inserting the key signal into the information signal to produce a modified information signal; recording the modified information signal if the key signal is not detected in the information signal; and inhibiting the recording of the modified information signal if the key signal is detected in the information signal.
Other objects, features, and advantages according to the present invention will become apparent from the following detailed description of illustrated embodiments when read in conjunction with the accompanying drawings in which the same components are identified by the same reference numerals.
REFERENCES:
patent: 5453968 (1995-09-01), Veldhuis et al.
patent: 5535188 (1996-07-01), Dang et al.
patent: 5621840 (1997-04-01), Kawamura et al.
patent: 5627655 (1997-05-01), Okamoto et al.
patent: 6115533 (2000-09-01), Tahara et al.
patent: 0 519 320 A (1992-12-01), None
patent: 0 581 227 A (1994-02-01), None
patent: 0 618 723 A (1994-10-01), None
patent: 0 667 720 A (1995-08-01), None
patent: 0 717 564 A (1996-06-01), None
patent: 0 762 759 A (1997-03-01), None
patent: 3-125375 (1991-05-01), None
patent: 6-4884 (1994-01-01), None
Fujinami Yasushi
Koyanagi Hideki
Tahara Katsumi
Yagasaki Yoichi
Chevalier Robert
Frommer William S.
Frommer Lawrence & Huag LLP.
Savit Glenn F.
Sony Corporation
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