Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
2000-06-12
2003-03-18
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C380S268000
Reexamination Certificate
active
06535687
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to electronic video reproduction systems and more particularly to methods and devices for preventing unauthorized duplication of electronic video presentations.
BACKGROUND OF INVENTION
The present invention is described as it relates to digital movies and their presentation in theatres, however it should be understood to be equally applicable to other digital video presentations methods and systems.
A major problem with digital movies today is piracy, or the unauthorized reproduction thereof. Pirated copies of movies can be found on film and other electronic media, such as video tape, or magnetic or optical disk. Pirated movies are sold around the world and shown without any royalties being paid to the proper persons, e.g. the originators or studio. Accordingly, it is desirable that electronic video presentation systems be as secure as possible and as immune to piracy as possible.
In an electronic video presentation system dedicated to showing digital movies or video presentations, data representative of the movie or video presentation is relatively secure for most parts of the system.
FIG. 1
illustrates such a system
10
. In referring to the figures, like references designate like elements of the invention.
Referring to
FIG. 1
, a video presentation such as a movie is typically prepared at a location
20
such as a studio. The movie is typically displayed at a distinct location
30
such as a theatre. Using conventional processing elements
40
at the studio
20
, a movie is captured and digitized, and compressed into a bitstream which is then encrypted to provide a secured, digital bitstream
50
. The movie is reproducible from the bitstream
50
. The encrypted bitstream
50
is transported to a remote location
30
by some means, such as a computer network or physical medium like a magnetic tape or disk, for example. In a theatre
30
, the encrypted bitstream
50
is decrypted and decompressed using conventional processing elements
60
. The decrypted, decompressed bitstream
70
is fed to projector
80
which displays it on a movie screen for example.
The physical studio
20
can be secured so as to protect the movie from being pirated. Between the studio
20
and theatre
30
, the bitstream
50
is encrypted. Hence, even if the bitstream
50
is intercepted or stolen, sufficiently robust encryption techniques exist and are used to prevent easy reproduction of pirated copies of the movie. Within the theatre
30
, decryption and decompression, using elements
60
, happen almost simultaneously. This typically is provided on the same computer platform which can also be made sufficiently secure using conventional locked housings, or enclosures.
However, over the transmission link between decryption and decompression by elements
60
and projector
80
, decrypted and decompressed signal
70
is conventionally a “clear” signal that can potentially be intercepted and stolen using appropriate equipment.
It is an object of the present invention to prevent theft or unauthorized duplication of signal
70
of a video presentation such as a movie.
SUMMARY OF INVENTION
A system and method for operating the system for deterring unauthorized reproduction of a video presentation including a plurality of images to be displayed, the system including: an encoder including: a first memory having a first plurality of addressable memory locations for storing at each of the locations data corresponding to a portion of at least one of the images to provide an array of data; and, a randomizer for pseudo-randomly addressing the first memory to provide a pseudo-random data signal corresponding to the one of the images; and, a decoder including: a second memory having a second plurality of addressable memory locations; and, a derandomizer for receiving the pseudo-random data signal and for pseudo-randomly applying the received data to the second plurality of memory locations corresponding to the original memory location array in the first memory to provide the array of data as stored in the first memory in the second memory locations and being capable of being conventionally addressed to provide a signal for reception by a display device.
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Reitmeier Glenn Arthur
Tinker Michael
Burke William J.
Nguyen Huy
Sarnoff Corporation
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