US5757909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illegal view and copy protection method in digital video system and controlling method thereof
Assignee: LG Electronics Inc
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Filing: 1995-11-22
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Granted: 1998-05-26
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Expires: 2015-11-22
Abstract
Abstract Illegal view and copy protection method in a digital video system for preventing an illegal user from viewing the digital video system and copying therefrom, by setting a descrambling method which decrypts split keystreams adopting a smart card, including a determination step for determining received data of having been scrambled; a reproduction step, a recording step, and a transporting step, wherein the reproduction step, the recording step and the transporting step can be performed simultaneously or selectively.
Inventors
- 👤 Tae Joon Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:31
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/234; H04N21/2347; H04N21/23476; G; G11; G11B; G11B20/00; G11B20/10; G11B20/00086; G11B20/0021; G11B20/00217; G11B20/00231; G11B20/00485; G11B20/00492; G11B20/00536; H04N21/40; H04N21/43; H04N21/44; H04N21/4408; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N7/00; H04N7/16; H04N7/162; H04N7/163; H04N7/167; H04N7/1675; G06; G06F; G06F2211/00; G06F2211/007; H04N2005/91307; H04N2005/91328; H04N2005/91357; H04N2005/91364
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
243 words
An illegal view and copy protection method in a digital video system comprising: a determination step for determining received data of having been scrambled; a reproduction step, if the received data was determined to be scrambled data in the determination step, splitting the scrambled data into a bitstream and a keystream for decrypting the split keystream for reading in key information, and descrambling the split bitstream according to the read in key information for displaying the bitstream on a display; a recording step for, if the received data was determined to be scrambled data in the determination step, recording the scrambled data on a recording medium either as scrambled data of a bitstream and a keystream according to a recording or copying mode, or after splitting the scrambled data into a bitstream and a keystream, encrypting the split keystream, and mixing the encrypted keystream with the bitstream; and a transporting step, if the received data was determined to be scrambled data in the determination step, splitting the scrambled data into a bitstream and a keystream for transporting the split keystream either after decrypting the split keystream with respect to key information from recording side according to a pay-per-copy mode or a back-up copy mode, or after decrypting the split keystream two times with respect to key information of said keystream's and key information from recording side; thereby the reproduction step, the recording step and the transporting step can be performed simultaneously or selectively.
Claim 2
Dependent Claim
243 words
An illegal view and copy protection method in a digital video system comprising: a determination step for determining received data of having been scrambled; a reproduction step, if the received data was determined to be scrambled data in the determination step, splitting the scrambled data into a bitstream and a keystream for decrypting the split keystream for reading in key information, and descrambling the split bitstream according to the read in key information for displaying the bitstream on a display; a recording step for, if the received data was determined to be scrambled data in the determination step, recording the scrambled data on a recording medium either as scrambled data of a bitstream and a keystream according to a recording or copying mode, or after splitting the scrambled data into a bitstream and a keystream, encrypting the split keystream, and mixing the encrypted keystream with the bitstream; and a transporting step, if the received data was determined to be scrambled data in the determination step, splitting the scrambled data into a bitstream and a keystream for transporting the split keystream either after decrypting the split keystream with respect to key information from recording side according to a pay-per-copy mode or a back-up copy mode, or after decrypting the split keystream two times with respect to key information of said keystream's and key information from recording side; thereby the reproduction step, the recording step and the transporting step can be performed simultaneously or selectively.
Claim 3
Dependent Claim
48 words
An illegal view and copy protection method in a digital video system as claimed in claim 1, wherein, if the received data was determined to be partially scrambled data in the determination step, said illegal view and copy protection method is applied only to the partially scrambled data.
Claim 4
Dependent Claim
38 words
An illegal view and copy protection method in a digital video system as claimed in claim 1, wherein the reproduction step includes the step of decrypting said split keystream with a decryption algorithm, for reading in key information.
Claim 5
Dependent Claim
198 words
An illegal view and copy protection method in a digital video system as claimed in claim 1, wherein a copying operation in the recording step includes, a first step for encrypting the key stream with respect to said keystream's key information, a second step for determining the encrypted keystream of being a back-up copy mode or a pay-per-copy mode, a third step for, if the mode was determined to be the pay-per-copy mode in the first step, encrypting the keystream transported after being decrypted with respect to the key information from a recording side, and then inserting the same into a position corresponding to an index code to record the same together with the bitstream, and a fourth step for, if the mode is determined to be the back-up copy mode in the second step, encrypting the keystream transported after being decrypted with respect to said keystream's key information and the key information from a recording side with respect to the key information from a recording side, decrypting the same with respect to said keystream's key information, and then inserting the same into a position corresponding to an index code, to record the same together with the bitstream.
Claim 6
Dependent Claim
143 words
An illegal view and copy protection method in a digital video system as claimed in claim 4, wherein said pay-per-copy mode operation the third step includes, a first transportation step for transporting the scrambled data after splitting the bitstream and the keystream and inserting said index code into the split portion of said keystream, a second transportation step for transporting the keystream split in the first transportation step after encrypting the keystream with respect to said keystream's key information and decrypting the same with respect to the key information from a recording side, a recording step for recording the keystream transported in the second transportation step on a recording medium after encrypting the keystream with respect to the key information from a recording side in correspondence with the index code and mixing the same with the bitstream transported in the first transportation step.
Claim 7
Dependent Claim
119 words
An illegal view and copy protection method in a digital video system as claimed in claim 5, wherein the reproduction operation after finish of the recording step includes, a splitting step for splitting the reproduced bitstream into a bitstream and a keystream and inserting an index code into the split portion of the keystream, an encrypting step for encrypting the keystream split in the splitting step with respect to said keystream's key information, a reading in step for reading in key information by decrypting the keystream encrypted in the encrypting step, with respect to said keystream's key information, and a decrypting step for descrambling the bitstream split according to the key information read in in the reading in step.
Claim 8
Dependent Claim
155 words
An illegal view and copy protection method in a digital video system as claimed in claim 4, wherein said back-up copy mode operation in the fourth step includes, a first transportation step for transporting the scrambled data after splitting the scrambled data into a bitstream and a keystream and inserting an index code into the split portion of the keystream, a second transportation step for transporting the keystream split in the first transportation step after encrypting the keystream with respect to said keystream's key information and decrypting the encrypted keystream with respect to the key information from a recording side and said keystream's key information, a recording step for recording the keystream transported in the second transportation step on a recording medium after encrypting the keystream with respect to the key information from a recording side in correspondence with the index code and mixing the same with the bitstream transported in the first transportation step.
Claim 9
Dependent Claim
126 words
An illegal view and copy protection method in a digital video system as claimed in claim 7, wherein the reproduction operation after finish of the recording step includes, a splitting step for splitting the reproduced bitstream into a bitstream and a keystream and inserting an index code into the split portion of the keystream, an encrypting step for encrypting the keystream split in the splitting step with respect to said keystream's key information, a reading in step for reading in key information by decrypting the keystream encrypted for two times in the encrypting step, with respect to said keystream's key information and the MPEG bitstream, and a decrypting step for descrambling the bitstream split according to the key information read in in the reading in step.
Claim 10
Dependent Claim
101 words
An illegal view and copy protection method in a digital video system comprising: a reproduction step, on reception of scrambled data, splitting the scrambled data into a bitstream and a keystream for decrypting the split keystream for reading in key information, and descrambling the split bitstream according to the read in key information for displaying the bitstream on a display; and, a recording step for, on reception of scrambled data, recording the scrambled data on a recording medium as scrambled data of a bitstream and a keystream; thereby the reproduction step and the recording step can be performed simultaneously or selectively.
Claim 11
Dependent Claim
101 words
An illegal view and copy protection method in a digital video system comprising: a reproduction step, on reception of scrambled data, splitting the scrambled data into a bitstream and a keystream for decrypting the split keystream for reading in key information, and descrambling the split bitstream according to the read in key information for displaying the bitstream on a display; and, a recording step for, on reception of scrambled data, recording the scrambled data on a recording medium as scrambled data of a bitstream and a keystream; thereby the reproduction step and the recording step can be performed simultaneously or selectively.
Claim 12
Dependent Claim
49 words
An illegal view and copy protection method in a digital video system as claimed in claim 9, wherein the reproduction step includes the steps of decrypting said split keystream with a decryption algorithm for reading in key information and determining a descrambling method with the read in key information.
Claim 13
Dependent Claim
132 words
An illegal view and copy protection method in a digital video system as claimed in claim 9, wherein the reproduction operation after finish of the recording step includes, a splitting step for splitting the reproduced bitstream into a bitstream and a keystream and inserting an index code into the split portion of the keystream, an encrypting step for encrypting the keystream split in the splitting step according to an encrypting algorithm with respect to said keystream's key information, a reading in step for reading in key information by decrypting the keystream encrypted for two times in the encrypting step, with respect to said keystream's key information, and a decrypting step for descrambling the bitstream split according to the key information read in in the reading in step for displaying on a display.
Claim 14
Dependent Claim
226 words
An illegal view and copy protection method in a digital video system on reception of a keystream encrypted with respect to said keystream's key information at copying, comprising: a determining step for determining the mode of the keystream being a back-up copy mode or a pay-per-copy mode; a first transportation step for, if the mode was determined to be a PPC mode in the determining step, decrypting the keystream with respect to key information from a recording side for transporting the keystream; a first recording step for encrypting the keystream transported in the first transportation step with respect to the key information from the recording side and inserting the encrypted keystream into a position corresponding to an index code, for recording the keystream together with a bitstream on a recording medium; a second transportation step for, if the mode was determined to be a back-up copy mode in the determining step, decrypting the keystream for two times with respect to said keystream's key information and the key information from the recording side for transporting the keystream; and a second recording step for encrypting the keystream transported in the second transportation step with respect to the key information from the recording side and inserting the encrypted keystream into the position corresponding to the index code, for recording the keystream together with the bitstream on a recording medium.
Claim 15
Dependent Claim
226 words
An illegal view and copy protection method in a digital video system on reception of a keystream encrypted with respect to said keystream's key information at copying, comprising: a determining step for determining the mode of the keystream being a back-up copy mode or a pay-per-copy mode; a first transportation step for, if the mode was determined to be a PPC mode in the determining step, decrypting the keystream with respect to key information from a recording side for transporting the keystream; a first recording step for encrypting the keystream transported in the first transportation step with respect to the key information from the recording side and inserting the encrypted keystream into a position corresponding to an index code, for recording the keystream together with a bitstream on a recording medium; a second transportation step for, if the mode was determined to be a back-up copy mode in the determining step, decrypting the keystream for two times with respect to said keystream's key information and the key information from the recording side for transporting the keystream; and a second recording step for encrypting the keystream transported in the second transportation step with respect to the key information from the recording side and inserting the encrypted keystream into the position corresponding to the index code, for recording the keystream together with the bitstream on a recording medium.
Claim 16
Dependent Claim
63 words
An illegal view and copy protection method in a digital video system as claimed in claim 12, wherein the first transportation step includes the steps for decrypting the keystream, encrypted with respect to said keystream's key information, with respect to said keystream's key information and decrypting the keystream again with respect to the key information from the recording side, for transporting the keystream.
Claim 17
Dependent Claim
66 words
An illegal view and copy protection method in a digital video system as claimed in claim 12, wherein the second transportation step includes the step for decrypting the bitstream, decrypted with respect to said keystream's key information, for two times with respect to said keystream's key information and decrypting the keystream again with respect to the key information from the recording side for transporting the keystream.
Claim 18
Dependent Claim
173 words
An illegal view and copy protection method in a digital video system, comprising: a pay-per-copy mode reproduction step for having determined the recording medium being a pay-per-copy recording medium on detection of a keystream at reproduction from a recording medium, encrypting the keystream with respect to said keystream's key information and decrypting the keystream with respect to said keystream's key information for reading in the key information, for descrambling the bitstream using both the read in key information and an index code; and, a `back-up copy` mode reproduction step for, having determined the recording medium being a `back-up copy` recording medium on detection of a keystream decrypted with respect to said keystream's key information at reproduction from a recording medium, encrypting the keystream for two times with respect to said keystream's key information and the key information from a recording side and decrypting the keystream with respect to said keystream's key information for reading in the key information, for descrambling the bitstream using both the read in key information and an index code.
Claim 19
Dependent Claim
173 words
An illegal view and copy protection method in a digital video system, comprising: a pay-per-copy mode reproduction step for having determined the recording medium being a pay-per-copy recording medium on detection of a keystream at reproduction from a recording medium, encrypting the keystream with respect to said keystream's key information and decrypting the keystream with respect to said keystream's key information for reading in the key information, for descrambling the bitstream using both the read in key information and an index code; and, a `back-up copy` mode reproduction step for, having determined the recording medium being a `back-up copy` recording medium on detection of a keystream decrypted with respect to said keystream's key information at reproduction from a recording medium, encrypting the keystream for two times with respect to said keystream's key information and the key information from a recording side and decrypting the keystream with respect to said keystream's key information for reading in the key information, for descrambling the bitstream using both the read in key information and an index code.
Claim 20
Dependent Claim
118 words
An illegal view and copy protection device in a digital video system, comprising: demodulating & error correcting means for demodulating a broadcasting signal and Reed Solomon decoding said signal; copy protection processing means for transporting the output of said demodulating & error correcting means to a digital recording/reproduction device, splitting the scrambled recording signal reproduced from said digital recording/reproduction device into a bitstream and a keystream, and encrypting the split keystream; decoding means for descrambling the bitstream from said demodulating & error correcting means or the copy protection processing means according to descrambling information; and, a smart card for decrypting the encrypted keystream of said copy protection processing means for applying to said decoding means as descrambling information.
Claim 21
Dependent Claim
118 words
An illegal view and copy protection device in a digital video system, comprising: demodulating & error correcting means for demodulating a broadcasting signal and Reed Solomon decoding said signal; copy protection processing means for transporting the output of said demodulating & error correcting means to a digital recording/reproduction device, splitting the scrambled recording signal reproduced from said digital recording/reproduction device into a bitstream and a keystream, and encrypting the split keystream; decoding means for descrambling the bitstream from said demodulating & error correcting means or the copy protection processing means according to descrambling information; and, a smart card for decrypting the encrypted keystream of said copy protection processing means for applying to said decoding means as descrambling information.
Claim 22
Dependent Claim
62 words
An illegal view and copy protection device in a digital video system as claimed in claim 16, wherein said illegal view protection function is performed such that said decoding means connected to said demodulating & error correcting means is connected to said smart card to decode the keystream of said decoding means and the descrambling information is output to said decoding means.
Claim 23
Dependent Claim
42 words
An illegal view and copy protection device in a digital video system as claimed in claim 16, wherein first recording is performed by connected said copy protection processing means connected to said demodulating & error correcting means to said digital recording/reproduction device.
Claim 24
Dependent Claim
108 words
An illegal view and copy protection device in a digital video system as claimed in claim 16, wherein the illegal reproduction protection is performed such that a keystream line of said copy protection processing means connected to said digital recording/reproduction device is connected to said smart card, a bitstream line is connected to said decoding means, and said copy protection processing means and said decoding means are connected to each other, so that said smart card decrypts the keystream of said copy protection processing means into its own key information corresponding to the index code of said decoding means to then output the same to said decoding means.
Claim 25
Dependent Claim
59 words
An illegal view and copy protection device in a digital video system as claimed in claim 19, wherein said protection processing means encrypts twice the keystream split from reproduced data of said digital recording/reproduction during reproduction from a recording medium in a pay-per-copy mode with respect to said keystream's key information and transports the same to said smart card.
Claim 26
Dependent Claim
64 words
An illegal view and copy protection device in a digital video system as claimed in claim 19, wherein said protection processing means encrypts the keystream split from played-back data of said digital recording/reproduction device for more than two times during reproduction from a recording medium in back-up copy mode with respect to said keystream's key information and transports the same to said smart card.
Claim 27
Dependent Claim
64 words
An illegal view and copy protection device in a digital video system as claimed in claim 16, wherein said copy protection processing means includes: a RAM for storing intrinsic key information of said smart card, an algorithm storage memory for storing an encryption algorithm, and a processor for executing an encryption program of said algorithm storage memory with the key information of said RAM.
Claim 28
Dependent Claim
70 words
An illegal view and copy protection device in a digital video system as claimed in claim 16, wherein said smart card includes: a first algorithm storage memory for storing a decryption algorithm program for a bitstream, a second algorithm storage memory for storing said smart card's decryption algorithm program, a ROM for storing said smart card's key information, and a RAM for temporarily storing key information of another smart card.
Claim 29
Dependent Claim
120 words
An illegal view and copy protection device in a digital video system comprising: first copy protection processing means for splitting reproduction data from a first digital recording/reproduction device into a bitstream and a keystream and encrypting the split keystream; first and second smart cards for decrypting encrypted keystream from said first copy protection processing means with respect to said keystream's key information and the key information from a recording side; and, second copy protection processing means for encrypting the keystream from the first smart card transported through the second smart card with respect to said keystream's key information and transporting the encrypted keystream together with the split bitstream to a second digital recording/reproduction device, for recording on a recording medium.
Claim 30
Dependent Claim
120 words
An illegal view and copy protection device in a digital video system comprising: first copy protection processing means for splitting reproduction data from a first digital recording/reproduction device into a bitstream and a keystream and encrypting the split keystream; first and second smart cards for decrypting encrypted keystream from said first copy protection processing means with respect to said keystream's key information and the key information from a recording side; and, second copy protection processing means for encrypting the keystream from the first smart card transported through the second smart card with respect to said keystream's key information and transporting the encrypted keystream together with the split bitstream to a second digital recording/reproduction device, for recording on a recording medium.
Claim 31
Dependent Claim
43 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein said first copy protection processing means encrypts the keystream with respect to said keystream's key information and transports the same to said first smart card.
Claim 32
Dependent Claim
55 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein said smart card decrypts the keystream of said first copy protection processing means with respect to said keystream's key information and the key information of recording side and then transports the same to said second smart card.
Claim 33
Dependent Claim
54 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein said second copy protection processing means encrypts the keystream transported from said second smart card with respect to said keystream's key information and mixes the same with the bitstream from said first copy protection processing means.
Claim 34
Dependent Claim
59 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein said first smart card decrypts the keystream from said first copy protection processing means twice with respect to said keystream's key information during a back-up copy mode and decrypts the same with respect to the key information from a recording side.
Claim 35
Dependent Claim
48 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein said second copy protection processing means encrypts the keystream transported from said second smart card with respect to said keystream's key information and mixes the encrypted keystream with the bitstream.
Claim 36
Dependent Claim
69 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein each of said first and second copy protection processing means includes a RAM for storing intrinsic key information of said smart card, an algorithm storage memory for storing an encryption algorithm, and a processor for executing an encryption program of said algorithm storage memory with the key information of said RAM.
Claim 37
Dependent Claim
73 words
An illegal view and copy protection device in a digital video system as claimed in claim 24, wherein each of said first and second smart cards includes a first algorithm storage memory for storing a decryption algorithm program for a bitstream, a second algorithm storage memory for storing said keystream's decryption algorithm program, a ROM for storing said keystream's key information, and a RAM for temporarily storing key information of another smart card.
Claim 38
Dependent Claim
64 words
An illegal view and copy protection device in a digital video system as claimed in claim 18, wherein said copy protection processing means includes: a RAM for storing intrinsic key information of said smart card, an algorithm storage memory for storing an encryption algorithm, and a processor for executing an encryption program of said algorithm storage memory with the key information of said RAM.
Claim 39
Dependent Claim
64 words
An illegal view and copy protection device in a digital video system as claimed in claim 19, wherein said copy protection processing means includes: a RAM for storing intrinsic key information of said smart card, an algorithm storage memory for storing an encryption algorithm, and a processor for executing an encryption program of said algorithm storage memory with the key information of said RAM.
Claim 40
Dependent Claim
70 words
An illegal view and copy protection device in a digital video system as claimed in claim 17, wherein said smart card includes: a first algorithm storage memory for storing a decryption algorithm program for a bitstream, a second algorithm storage memory for storing said smart card's decryption algorithm program, a ROM for storing said smart card's key information, and a RAM for temporarily storing key information of another smart card.
Claim 41
Dependent Claim
70 words
An illegal view and copy protection device in a digital video system as claimed in claim 19, wherein said smart card includes: a first algorithm storage memory for storing a decryption algorithm program for a bitstream, a second algorithm storage memory for storing said smart card's decryption algorithm program, a ROM for storing said smart card's key information, and a RAM for temporarily storing key information of another smart card.
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) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |