US5689559A
Expired / Lapsed
US
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Copy prevention method and apparatus of a digital magnetic recording/reproducing system
Assignee: LG Electronics Inc
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Filing: 1995-12-01
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Granted: 1997-11-18
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Expires: 2015-12-01
Abstract
Abstract A copy prevention method and apparatus of a digital magnetic recording/reproducing system performs the copy prevention function by encoding to insert a marker involving copy prevention function information and executing the function and allows a program supplier to realize a desired copy prevention function of various patterns, in which the marker formed by a control word for scrambling audio and video bit straps and copy prevention information for preventing an illegal copy is encrypted by an encoded key to be multiplexed with the audio and video bit strips scrambled by the control word. The marker transmitted is detected from the bit strips to be decrypted and analyzed by the encoded key to determine whether the copy is permitted or not, so that the detected marker is updated to be recorded on a video tape and the control word is produced from the marker to perform the descrambling to supply the result to a monitor to be displayed. Thus, the program supplier selects the copy prevention function, and a separate format converting apparatus is not required since a field defined within a GA format is utilized while an existing DVCR is not need to be changed for performing the copy prevention function as the data amount to be recorded is not increased.
Inventors
- 👤 Tae Joon Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:58
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/10; G11; G11B; G11B20/00; G11B20/10; G11B20/00086; G11B20/0021; G11B20/00217; G11B20/00253; G11B20/00333; G11B20/00485; G11B20/00557; G11B20/00731; G11B20/00746; G11B20/00753; G11B20/00768; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G06F2211/00; G06F2211/007; H04N2005/91307; H04N2005/91328; H04N2005/91357; H04N2005/91364
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
138 words
A copy prevention method of a digital magnetic recording/reproducing system comprising: an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, and an audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.
Claim 2
Dependent Claim
138 words
A copy prevention method of a digital magnetic recording/reproducing system comprising: an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, and an audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.
Claim 3
Dependent Claim
28 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said marker is placed on a transport-private-data field within said bit strips.
Claim 4
Dependent Claim
49 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 2, wherein said marker is comprised of a copy prevention information area recorded with said copy prevention information for preventing said illegal copy, and a control word area recorded with said control word for descrambling.
Claim 5
Dependent Claim
23 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 3, wherein said marker is formed of 8 bytes.
Claim 6
Dependent Claim
25 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 4, wherein said copy prevention area is formed of one byte.
Claim 7
Dependent Claim
25 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 4, wherein said control word area is formed of four bytes.
Claim 8
Dependent Claim
40 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 3, wherein said copy prevention information is formatted by including a generational copy control field for restricting the number of permitting said copy of a program.
Claim 9
Dependent Claim
47 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 7, wherein said generational copy control field comprises: an allowable generational field for restricting the copy number of said program; and a current generational field representing a current generation of a duplicated program.
Claim 10
Dependent Claim
136 words
A copy prevention-method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said audio and video transmitting process comprises: an audio and video bit-strip encoding step of encoding said audio and video bit strips; a control word generating step of generating said control word for scrambling; a scrambling step for scrambling said encoded audio and video bit strips by means of said generated control word; a copy prevention information generating step of generating said copy prevention information for preventing said illegal copy; a marker generating and encrypting step of generating said marker by means of said generated control word and copy prevention information and encrypting said marker by means of said encoded key; and a multiplexing and transmitting step of multiplexing to transmit said scrambled audio and video bit strips and encrypted marker.
Claim 11
Dependent Claim
140 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said audio and video signal receiving/recording process comprises: a marker detecting step of demultiplexing said transmitted bit strips to detect said marker, and decrypting said marker by means of said encoded key; a marker analyzing step of analyzing said detected marker to determine whether said copy is permitted or not, and detecting said control word; an audio and video decoding step of descrambling and decoding said transmitted audio and video bit strips by means of said detected control word, and outputting said audio and video signals; and a marker inserting step of updating said detected marker and encrypting said updated marker by means of said encoded key to insert the result when it is determined that said copy is permitted after analyzing said marker.
Claim 12
Dependent Claim
116 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 10, wherein said marker analyzing step comprises: a copy prevention information detecting step of detecting said copy prevention information for preventing said illegal copy from said detected marker; a copy number restricting step of comparing an allowable generation of said allowable generational field and a current generation of said current generational field representing said current generation for restricting the number of permitting said copy of said program within said detected copy prevention information, and determining whether said copy is permitted or not-to process the result; and a control word detecting step of detecting said control word for descrambling from said detected marker.
Claim 13
Dependent Claim
91 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 11, wherein said copy number restricting step comprises: comparing said allowable generation of said allowable generational field with said current generation of said current generational field to determine whether said allowable generation is below said current generation; inhibiting said copy when it is determined that said allowable generation is below said current generation; and permitting said copy when it is determined that said allowable generation is-not below said current generation, and proceeding to said marker inserting step.
Claim 14
Dependent Claim
43 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 12, wherein said step of inhibiting said copy is performed by destructing said control word or impeding an output of said control word to block a reproduction after recording.
Claim 15
Dependent Claim
22 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 10, wherein said control word is periodically changed.
Claim 16
Dependent Claim
27 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 14, wherein said control word is changed in the interval of 0.6 second.
Claim 17
Dependent Claim
34 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 14, wherein said marker is placed on said transport-private-data field within said bit strips whenever said control word is changed.
Claim 18
Dependent Claim
58 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 16, wherein said marker inserting step comprises the steps of: updating said marker when the analysis of said marker determines to permit said copy; encrypting said updated marker by means of said encoded key; and replacably inserting said encrypted marker with a succeeding marker.
Claim 19
Dependent Claim
29 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 1, wherein said encoded key is transported via a separate transmission line to be stored.
Claim 20
Dependent Claim
31 words
A copy prevention method of a digital magnetic recording/reproducing system as claimed in claim 18, wherein said encoded key is transported via said separate transmission line for a prescribed time interval.
Claim 21
Dependent Claim
151 words
A copy prevention apparatus of a digital magnetic recording/reproducing system comprising: an encrypted marker detecting and inserting part for detecting a marker from input bit strips, and inserting an updated marker to said bit strips to output the result; a marker analyzing and processing part for decrypting and analyzing the encrypted marker from said marker detecting and inserting part by means of an encoded key, outputting a control word for descrambling said bit strips, and updating and encrypting the decrypted marker by means of said encoded key to output the result; a buffer part for buffering said control word and updated and encrypted marker from said marker analyzing and processing part, and inserting said updated and encrypted marker in said marker detecting and inserting part; and a descrambler for descrambling said bit strips provided via said marker detecting and inserting pant by means of said control word from said buffer part.
Claim 22
Dependent Claim
151 words
A copy prevention apparatus of a digital magnetic recording/reproducing system comprising: an encrypted marker detecting and inserting part for detecting a marker from input bit strips, and inserting an updated marker to said bit strips to output the result; a marker analyzing and processing part for decrypting and analyzing the encrypted marker from said marker detecting and inserting part by means of an encoded key, outputting a control word for descrambling said bit strips, and updating and encrypting the decrypted marker by means of said encoded key to output the result; a buffer part for buffering said control word and updated and encrypted marker from said marker analyzing and processing part, and inserting said updated and encrypted marker in said marker detecting and inserting part; and a descrambler for descrambling said bit strips provided via said marker detecting and inserting pant by means of said control word from said buffer part.
Claim 23
Dependent Claim
29 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said encoded key is transported via a separate transmission line to be stored.
Claim 24
Dependent Claim
31 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 21, wherein said encoded key is transported via said separate transmission line for a prescribed time interval.
Claim 25
Dependent Claim
34 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said marker is placed on a transport-private-data field within said bit strips whenever said control word is changed.
Claim 26
Dependent Claim
49 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 23, wherein said marker is comprised of a copy prevention information area recorded with said copy prevention information for preventing said illegal copy, and a control word area recorded with said control word for descrambling.
Claim 27
Dependent Claim
23 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said marker is formed of 8 bytes.
Claim 28
Dependent Claim
25 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 25, wherein said copy prevention area is formed of one byte.
Claim 29
Dependent Claim
25 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 25, wherein said control word area is formed of four bytes.
Claim 30
Dependent Claim
37 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said copy prevention information is formatted by including a generational copy control field for restricting the copy number of a program.
Claim 31
Dependent Claim
50 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 28, wherein said generational copy control field comprises: an allowable generational field for restricting the number of permitting the copy of a program; and a current generational field representing a current generation of a duplicated program.
Claim 32
Dependent Claim
22 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said control word is periodically changed.
Claim 33
Dependent Claim
27 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said control word is changed in the interval of 0.6 second.
Claim 34
Dependent Claim
34 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said marker is placed on a transport-private-data field within said bit strips whenever said control word is changed.
Claim 35
Dependent Claim
31 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 30, wherein said marker detecting and inserting part replacably inserts said updated marker with a succeeding marker.
Claim 36
Dependent Claim
129 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said marker detecting and inserting part comprises: a marker detecting section for detecting to output said encrypted marker from said input bit strips to said marker analyzing and processing part, outputting a marker detection flag signal for informing of the position of said encrypted marker within said bit strips to said descrambler to be used as a reference signal of initializing said descrambler, and outputting said bit strips; and a marker inserting section for inserting said updated and encrypted marker from said buffer part to said bit strips from said marker detecting section in accordance with said marker detection flag signal from said marker detecting section to output the result to said descrambler.
Claim 37
Dependent Claim
131 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 24, wherein said marker analyzing and processing part comprises: a marker decoding section for decrypting said encrypted marker from said marker detecting and inserting part by means of said encoded key; a marker analyzing section for analyzing said copy prevention information within said marker from said marker decoding section, and outputting said control word to said buffer part and a control signal for updating said marker when said copy is permitted; and a marker updating and encoding section for updating said marker from said marker decoding section in accordance with said control signal from said marker analyzing section, and encrypting said updated marker by means of said encoded key to output the result to said buffer part.
Claim 38
Dependent Claim
48 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 35, wherein said marker analyzing and processing part further comprises an encoded key storage section for storing said encoded key to output it to said marker analyzing section and marker updating and encoding section.
Claim 39
Dependent Claim
55 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 35, wherein said marker analyzing section compares an allowable generation of an allowable generational field with a current generation of a current generational field representing a current generation of a duplicated program to determine whether said copy is permitted or not.
Claim 40
Dependent Claim
74 words
A copy prevention apparatus of a digital magnetic recording/reproducing system as claimed in claim 20, wherein said buffer part comprises: a marker buffer for temporally storing said updated and encrypted marker from said marker analyzing and processing part, and outputting the result to said marker detecting and inserting part; and a control word buffer for temporally storing said control word from said marker analyzing and processing part, and outputting the result to said descrambler.
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) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |