CN103686351A - Descrambling device and television system using descrambling device - Google Patents
Descrambling device and television system using descrambling device Download PDFInfo
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- CN103686351A CN103686351A CN201210357849.5A CN201210357849A CN103686351A CN 103686351 A CN103686351 A CN 103686351A CN 201210357849 A CN201210357849 A CN 201210357849A CN 103686351 A CN103686351 A CN 103686351A
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Abstract
The invention provides a descrambling device comprising a descrambling module and a one-time programmable module. The descrambling module is used for descrambling an input data flow. When the one-time programmable module is in a first state, the descrambling module descrambles the input data flow in a first mode. When the one-time programmable module is in a second state which is different from the first state, the descrambling module descrambles the input data flow in a second mode.
Description
Technical field
The present invention is relevant to descrambling technology.
Background technology
TV programme supplier is in order to ensure the rights and interests of oneself, conventionally can be by the content scrambling of pay television channel (scrambling), and only the required crucial information of descrambling program is offered to the user of charges paid.Dissimilar, the mechanism of scrambling in various degree that the TV programme supplier of different regions may adopt.The numerical digit video broadcasting being widely adopted at present-common scrambling algorithm (digital video broadcasting common scrambling algorithm, DVB-CSA) be must be provided with two bits in the shelves head of each image block of standard, in order to indicate the contained presentation content of this image block, whether have through scrambling, should organize golden key descrambling with which.
For more protection degree; the TV dealer of certain areas can be used alternatingly several golden keys and carry out scrambling image block; last hundred image blocks for example setting in same video streaming must be with the first gold medal key descrambling; thereafter 100 image blocks change with the second gold medal key descrambling; 100 image blocks subsequently change with the first gold medal key descrambling again, so go round and begin again.In this case, TV programme supplier can offer user's (can be stored in the memory of receiving terminal) by the first gold medal key and the second gold medal key in advance, and receiving terminal must be according to the correct golden key of the instant selection of a shelves content of each image block when carrying out descrambling program.
In order to reduce cost of manufacture and stock control difficulty, the producer of descrambling chip is sold to same chip respectively two areas that adopt different scrambling mechanism sometimes, but not manufactures separately different chips for two areas.For example, the TV dealer who supposes A area is with all image blocks of single golden key scrambling, the TV dealer in B district adopts the scheme replacing with the scramblings of two groups of gold keys, descrambling chip can be designed to: can replace descrambling (meeting B district demand) with two groups of gold keys, also can close part function, only with single golden key descrambling (meet A area demand).
Current chip maker be mostly before shipment according to shipment area the descrambling mechanism (for example close and will be sold to the part function of the descrambling chip in A area with software) with software set chip.Based on market, consider, chip maker conventionally can be lower than by the price in same chip sale ZhiBDi district by descrambling chip sale to the price in A area.Yet, for example, once be cracked, revise (opening the function that was originally set as closing by chip maker) in chip in order to set the software of descrambling pattern, the predetermined descrambling chip that will be sold to A area just may be transported to B district and use, and causes the massive losses of chip maker.
Summary of the invention
The present invention proposes a kind of new descrambler and applies the television system of this descrambler.By utilizing, can stylize but follow-up electrical fuse (e-fuse) or single programmable read-only memory (the one timeprogrammable read only memory that can not revise state by single, OTP-ROM), according to descrambler of the present invention, can effectively avoid aforementioned chip to dispatch from the factory after by the problem of malicious modification.
A specific embodiment according to the present invention is a kind of descrambler, wherein comprises a descrambling module and a single programmable module.This descrambling module is in order to by an input traffic descrambling.When this single programmable module is in one first state, this descrambling module is with this input traffic of first mode descrambling.When this single programmable module is in being different from one second state of this first state, this descrambling module is with one second this input traffic of pattern descrambling.
Another specific embodiment according to the present invention is a kind of television system, wherein comprises a descrambling module, a single programmable module and a playing module.This descrambling module is in order to by an input video stream descrambling, to produce an outputting video streams.When this single programmable module is in one first state, this descrambling module is with this input video stream of first mode descrambling.When this single programmable module is in being different from one second state of this first state, this descrambling module is with one second this input video stream of pattern descrambling.This playing module is in order to play the picture producing according to this outputting video streams.
About the advantages and spirit of the present invention, can be further understood by following detailed description and accompanying drawings.
Accompanying drawing explanation
Fig. 1 is according to the descrambler calcspar in a specific embodiment of the present invention.
Fig. 2 is a kind of calcspar of implementing example presenting according to descrambling module of the present invention.
Fig. 3 is according to the television system calcspar in a specific embodiment of the present invention.
Main element symbol description
100: descrambler 11,31: descrambling module
12,32: single programmable module 33: playing module
11A: the first buffer 11B: the second buffer
11C: selected cell 11D: descrambling unit
Embodiment
A specific embodiment according to the present invention is the descrambler 100 shown in Fig. 1, wherein comprises descrambling module 11 and single programmable (one time programmable) module 12.In actual applications, descrambler 100 for example can be incorporated into, in the various electronic installations (box on television system or television set) that have a descrambling demand, also can independently exist.
The descrambling module 11 with multiple descrambling pattern is in order to by an input traffic descrambling, and should with which kind of this input traffic of pattern descrambling according to the Determines of single programmable module 12.For example, whether descrambling module 11 can should carry out descrambling program, receptible golden key quantity, should in its descrambling program, which adopt organize golden key according to the Determines of single programmable module 12, or should adopt which kind of descrambling algorithm.Should be noted that, single programmable module 12 can be designed to have various states possibility, but following examples mainly be take single programmable module 12, to have the situation of two states possibility (the first state/the second state) be example.When single programmable module 12 is in the first state, descrambling module 11 is with this input traffic of first mode descrambling.When single programmable module 12 is in the second state, descrambling module 11 is with second this input traffic of pattern descrambling.
In practice, single programmable module 12 can be an electrical fuse (e-fuse).When this electrical fuse is conducting, single programmable module 12 is in the first state.When this electrical fuse is broken string, single programmable module 12 is in the second state.Or single programmable module 12 also can be a single programmable read-only memory (OTP-ROM).For example, when the descrambling region in this single programmable read-only memory is loaded with first content (numerical value A), this single programmable module is in the first state.For example, when this descrambling region is loaded with the second content (the numerical value B that is different from numerical value A) that is different from first content, this single programmable module is in the second state.
The producer of descrambler 100 can be before shipment according to the actual requirements (the descrambling mechanism that for example shipment area adopts) determine single programmable module 12 to be set as to the first state or the second state.If single programmable module 12 is electrical fuse, producer can be melted or retain the state that this electrical fuse is selected single programmable module 12 by burning.If single programmable module 12 is single programmable read-only memory, producer can write the state that different contents is selected single programmable module 12 by its descrambling region.
Fig. 2 has presented a kind of calcspar of implementing example of descrambling module 11.Descrambling module 11 in this example comprises the first buffer 11A, the second buffer 11B, selected cell 11C and descrambling unit 11D.In the first buffer 11A, storing the first gold medal key, is to store the second gold medal key in the second buffer 11B.This input traffic comprises a plurality of blocks, each self-contained one grade of head corresponding to one first gold medal key or one second gold medal key of each block.If the shelves head of a block, corresponding to the first gold medal key, represents that this block should be with the first gold medal key descrambling; If the shelves head of a block, corresponding to the second gold medal key, represents that this block should be with the second gold medal key descrambling.
Selected cell 11C determines to capture the first gold medal key or to capture the second gold medal key from the second buffer 11B from the first buffer 11A according to the shelves head of the state of single programmable module 12 and each block, as providing to a selection result of descrambling unit 11D.Descrambling unit 11D can be according to this this input traffic of selection result descrambling.If selected cell 11C judges that single programmable module 12 for example, in the first state (this electrical fuse is conducting), just can be according to the first corresponding gold medal key of the shelves heads acquisition of each block or the second gold medal key as this selection result.Relatively, if selected cell 11C judges that single programmable module 12 for example, in the second state (this electrical fuse by scorification as opening circuit), just can fix acquisition the first gold medal key as this selection result, or provide a prearranged signals as this selection result.
From the above, if the predetermined area that replaces scrambling input traffic with two groups of gold keys that descrambler 100 is sold to of producer, just can before shipment, single programmable module 12 be set as to the first state, make selected cell 11C possess the function of selecting golden key according to block shelves head.If producer is predetermined, descrambler 100 is sold to the area with single golden key scrambling input traffic, just can before shipment, single programmable module 12 be set as to the second state, and make the fixing acquisition of selected cell 11C the first gold medal key result alternatively.Or, if producer is predetermined, descrambler 100 is not sold to and can imposes to input traffic the area of any scrambling, just can before shipment, single programmable module 12 be set as to the second state, and make selected cell 11C provide a disable signal to require descrambling unit 11D to stop its descrambling program.
In above-mentioned example, the state that sees through setting single programmable module 12 can change the receptible golden key quantity of descrambling unit 11D.More broadly, descrambling module 11 can be designed to can organize golden key descrambling input traffic according to N in first mode, in the second pattern, can organize golden this input traffic of key descrambling according to M, and N and M are respectively a natural number, and N is not equal to M.In other embodiment, a plurality of states of single programmable module 12 can be designed to corresponding to different golden keys or different descrambling algorithms.
Electrical fuse just may be reconnected as conducting after being melted by burning hardly again.Similarly, single programmable read-only memory is edited the rear rewriting of just can not erasing again.The key property of the single programmable module that the embodiment of the present invention provides is follow-uply can not again revise its state, that is its state is irreversible after setting for the first time.The descrambler 100 shown in Fig. 2 of take is example, if single programmable module 12 is wherein set to the second state, just cannot be responded, is the first state again.The setting software that is easier to be cracked compared to employing, the producer of descrambler 100 can more effectively avoid the low price chip that is sold to an area to be converted to the higher regional problem of another chip price.
Another specific embodiment according to the present invention is television system 300 as shown in Figure 3, wherein comprises descrambling module 31, single programmable module 32 and playing module 33.Descrambling module 31 is in order to by an input video stream descrambling, to produce an outputting video streams.When single programmable module 32 is in one first state, descrambling module 31 is with this input video stream of first mode descrambling.When single programmable module 32 is in being different from one second state of this first state, descrambling module 31 is with one second this input video stream of pattern descrambling.Playing module 33 is in order to play the picture producing according to this outputting video streams.
The various variations (for example detailed execution mode of single programmable module and descrambling module) of previously having described when introducing descrambler 100 all can be applied in the television system 300 that Fig. 3 illustrates, and its details repeats no more.
As mentioned above, the embodiment of the present invention proposes a kind of new descrambler and applies the television system of this descrambler.By utilizing, can stylize but follow-up electrical fuse or the single programmable read-only memory that can not revise state by single, according to the descrambler of the embodiment of the present invention, can effectively avoid aforementioned chip to dispatch from the factory after by the problem of malicious modification.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and not with the above-mentioned preferred embodiment being disclosed, category of the present invention is limited.On the contrary, its objective is that hope can contain in the category of the scope of the claims of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (10)
1. a descrambler, comprises:
One descrambling module, in order to by an input traffic descrambling; And
One single programmable module, when this single programmable module is in one first state, this descrambling module is with this input traffic of first mode descrambling, when this single programmable module is in being different from one second state of this first state, this descrambling module is with one second this input traffic of pattern descrambling.
2. descrambler as claimed in claim 1, is characterized in that, this single programmable module is an electrical fuse, and when this electrical fuse is conducting, this single programmable module is in this first state; When this electrical fuse is broken string, this single programmable module is in this second state.
3. descrambler as claimed in claim 1, it is characterized in that, this single programmable module is a single programmable read-only memory, and when the descrambling region in this single programmable read-only memory is loaded with a first content, this single programmable module is in this first state; When this descrambling region is loaded with a second content that is different from this first content, this single programmable module is in this second state.
4. descrambler as claimed in claim 1, it is characterized in that, this descrambling module is organized golden this input traffic of key descrambling according to N in this first mode, and this descrambling module is organized golden this input traffic of key descrambling according to M in this second pattern, N and M are respectively a natural number, and N is not equal to M.
5. descrambler as claimed in claim 1, is characterized in that, this input traffic comprises a plurality of blocks, each self-contained one grade of head corresponding to one first gold medal key or one second gold medal key of each block, and this descrambling module comprises:
One first buffer, wherein stores this first gold medal key;
One second buffer, wherein stores this second gold medal key;
One selected cell, in order to according to this first state of this single programmable module or this second state and this grade of head, determine should from this first buffer capture this first gold medal key or certainly this second buffer capture this second gold medal key as a selection result; And
One descrambling unit, in order to according to this this input traffic of selection result descrambling;
If wherein judge, this single programmable module is in this first state, and this selected cell captures this corresponding the first gold medal key or this second gold medal key as this selection result according to this grade of head; If judge, this single programmable module is in this second state, and this selected cell captures this first gold medal key as this selection result or provides a prearranged signals as this selection result.
6. a television system, comprises:
One descrambling module, in order to by an input video stream descrambling, to produce an outputting video streams;
One single programmable module, when this single programmable module is in one first state, this descrambling module is with this input video stream of first mode descrambling, when this single programmable module is in being different from one second state of this first state, this descrambling module is with one second this input video stream of pattern descrambling; And
One playing module, in order to play the picture producing according to this outputting video streams.
7. television system as claimed in claim 6, is characterized in that, this single programmable module is an electrical fuse, and when this electrical fuse is conducting, this single programmable module is in this first state; When this electrical fuse is broken string, this single programmable module is in this second state.
8. television system as claimed in claim 6, it is characterized in that, this single programmable module is a single programmable read-only memory, and when the descrambling region in this single programmable read-only memory is loaded with a first content, this single programmable module is in this first state; When this descrambling region is loaded with a second content that is different from this first content, this single programmable module is in this second state.
9. television system as claimed in claim 6, it is characterized in that, this descrambling module is organized golden this input video stream of key descrambling according to N in this first mode, and this descrambling module is organized golden this input video stream of key descrambling according to M in this second pattern, N and M are respectively a natural number, and N is not equal to M.
10. television system as claimed in claim 6, is characterized in that, this input video stream comprises a plurality of image blocks, and each image block comprises one grade of head corresponding to one first gold medal key or one second gold medal key separately, and this descrambling module comprises:
One first buffer, wherein stores this first gold medal key;
One second buffer, wherein stores this second gold medal key;
One selected cell, in order to according to this first state of this single programmable module or this second state and this grade of head, determine should from this first buffer capture this first gold medal key or certainly this second buffer capture this second gold medal key as a selection result; And
One descrambling unit, in order to according to this this input video stream of selection result descrambling;
If wherein judge, this single programmable module is in this first state, and this selected cell captures this corresponding the first gold medal key or this second gold medal key as this selection result according to this grade of head; If judge, this single programmable module is in this second state, and this selected cell captures this first gold medal key as this selection result or provides a prearranged signals as this selection result.
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| CN201210357849.5A CN103686351B (en) | 2012-09-24 | 2012-09-24 | Descrambling device and television system using descrambling device |
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| CN201210357849.5A CN103686351B (en) | 2012-09-24 | 2012-09-24 | Descrambling device and television system using descrambling device |
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| CN101040526A (en) * | 2004-10-11 | 2007-09-19 | 索尼电子有限公司 | Digital rights management of a digital device |
| CN101569133A (en) * | 2006-12-28 | 2009-10-28 | 英特尔公司 | Protecting independent vendor encryption keys with a common primary encryption key |
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Effective date of registration: 20201013 Address after: No. 1, Xingzhu Road, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: No. 1, Xingzhu Road, Hsinchu Science Park, Taiwan, China Patentee before: MEDIATEK Inc. Patentee before: MSTAR SEMICONDUCTOR Inc. Effective date of registration: 20201013 Address after: No. 1, Xingzhu Road, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Patentee after: MSTAR SEMICONDUCTOR Inc. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road China science and Technology Development Institute of Technology Park Building No. three tower 4-5 No. Patentee before: Mstar Semiconductor,Inc. Patentee before: MSTAR SEMICONDUCTOR Inc. |
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