CN1301502C - Method for protecting DVD recording playback machine with anticopying function - Google Patents
Method for protecting DVD recording playback machine with anticopying function Download PDFInfo
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- CN1301502C CN1301502C CNB2003101027982A CN200310102798A CN1301502C CN 1301502 C CN1301502 C CN 1301502C CN B2003101027982 A CNB2003101027982 A CN B2003101027982A CN 200310102798 A CN200310102798 A CN 200310102798A CN 1301502 C CN1301502 C CN 1301502C
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- dvd videocorder
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Abstract
The present invention relates to a method for protecting a DVD recording playback machine with anti-copying function, which is achieved by connecting a microprocessor to a main chip in the DVD recording playback machine. The method comprises the following steps: firstly, three bytes generated by the microprocessor are set in a buffer which is a data storage unit in the microprocessor; then, the three bytes in the buffer are read and fed to the main chip in the DVD recording playback machine to check the correctness of the first read byte; if the first byte is correct, the other two bytes are received, and the three bytes are sent back to the microprocessor. The correctness of the three bytes is checked at least for one time; if the three bytes are correct through judgment, the main chip in the DVD recording playback machine can be proved to be authentic and recordable.
Description
Technical field
The present invention is a kind of guard method with DVD videocorder of copy-proof function, is to connect the inner main chip of a DVD videocorder by a microprocessor to reach.Can't copy the characteristic of internal processes code after utilizing this microprocessor to blow; be engaged in the method for three bytes of transmission between the inner main chip of this microprocessor and this DVD videocorder; and detect the mode of the correctness of these three bytes, protect the firmware (Firmware) in this DVD videocorder inside chip.
Background technology
Under the situation that the electronic product life cycle is lacked now, time of product development and listing process all can shorten as far as possible in many manufacturers, then there is illegal manufacturer to utilize various modes to take rival's hardware product, directly the entity circuit board is decomposited gerber (in the cad data form a kind of), utilize fried method that multilayer board is separated design (lay-out) company of giving, and flush out identical circuit board, just can finish duplicate circuit, reach copy very without circuit diagram.
As for firmware (Firmware) aspect, most now firmware is generally all transferred to high-speed cache and is come access.Early stage manufacturer can be with active program code (Boot Code) and kernel program code (KernelCode) separate storage, the active program code is stored in the electricallyerasable ROM (EEROM) (EEPROM), the kernel program code is stored in the high-speed cache (Flash ROM).But because the electricallyerasable ROM (EEROM) unit price is higher, most of manufacturer can remove electricallyerasable ROM (EEROM) in order to reduce manufacturing cost from circuit board, and active program code and the merging of kernel program code are stored in the high-speed cache.
Nowadays firmware directly is stored in the method for high-speed cache; though can be so that manufacturer reduces manufacturing cost but also causes a very large crisis virtually; this crisis is exactly that firmware is easy to be copied; illegal manufacturer is as long as disassemble and take burning company with high-speed cache from raw sheet; be burnt in the new high-speed cache of same model the high-speed cache of a identical content of so can remaking with using a byte of a byte of cd-rom recorder.
According to the method described above, illegal manufacturer can not must spend any research and development expense can obtain complete hardware and firmware like a cork, and causes the research and development achievement of former development company to throw sth. to the flowing water, deliver to the wind.
Summary of the invention
Therefore; the present invention proposes a kind of guard method with DVD videocorder of copy-proof function; this method is to add a microprocessor (Marco Processor) on hardware; be connected to general I/O (GPIO) the group pin position of the inner main chip of a DVD videocorder by the group of one or more I/O (I/O) on microprocessor pin position; use twin wire synchronized model serial I/O (I2C) group to do the response of random value simultaneously, reach the mode of protection firmware.The present invention uses the use of this microprocessor (MicroProcessor) to be that its program code can not be read out to come, because it is to come the burning program code in the mode that circuit is blown in inside, so be difficult for being copied.
The present invention provides following technological means and reaches the circuit of the DVD videocorder with copy-proof function and protection firmware function:
Major technique feature of the present invention is to be to provide a kind of guard method with DVD videocorder of copy-proof function; this method at first makes this microprocessor produce three bytes earlier and puts into an impact damper; this impact damper is to be the data-carrier store in this microprocessor; read these interior three bytes of this impact damper to the inner main chip of this DVD videocorder; whether this first byte of checking these three bytes that read mistake; if inerrancy then receives these two bytes in addition; send these three bytes back to and give this microprocessor; carry out whether these three bytes of one-time detection are correct at least; if be judged as these three bytes for correct, the inner main chip of then provable this DVD videocorder is legal and is recordable.
Technical scheme of the present invention is achieved in that
A kind of guard method with DVD videocorder of copy-proof function is characterized in that, is to reach by the main chip that a microprocessor connects a DVD videocorder inside, and this method comprises the following steps: at least
(a) with three bytes store that this microprocessor produced in an impact damper, this impact damper is positioned at a data-carrier store of this microprocessor;
(b) read this three bytes of being stored in this impact damper and these three bytes are sent in the main chip of this DVD videocorder inside;
(c) check first byte mistake whether these three bytes in this impact damper, read;
When (d) this first byte check is correct, continue to receive other two bytes in these three bytes:
(e) three bytes that this DVD videocorder is produced are sent back to this microprocessor;
(f) repeatedly carry out above-mentioned steps (a) to (e), whether correct with these three bytes of carrying out being stored in this impact damper of repeated detection; And
(g) when the test results is yes, the main chip of promptly judging this DVD videocorder inside is legal and is that writing function is arranged, if testing result for not the time, judges that then the main chip of this DVD videocorder inside is pirate, thereby the function of broadcast is only arranged and unwritten function.
Wherein, this first byte of these three bytes that this microprocessor produced is an identification code of this microprocessor special use, and this second byte is the inner main chip of DVD videocorder and a number of this microprocessor communication, and the 3rd byte is a random value.
Wherein, this identification code is a sexadecimal numerical value, and this arbitrarily is worth is sexadecimal numerical value
Wherein, in this checks step, when this first byte be wrong, then wait for a schedule time after, get back to the step in the main chip that reads interior these three bytes of being stored of this impact damper and these three bytes are sent to this DVD videocorder inside.
Wherein, this receiving step is meant that when this first byte is correct the main chip of this DVD videocorder inside continues to receive this second byte and the 3rd byte in the impact damper of this microprocessor.
Wherein, this to send step back to be that the main chip of this DVD videocorder inside returns to this microprocessor with these three bytes that this DVD videocorder produces.
Description of drawings
Fig. 1 is system architecture synoptic diagram of the present invention;
Fig. 2 is internal system circuit block diagram of the present invention; And
Fig. 3 is the schematic flow sheet for anti-copy program of the present invention.
Wherein, description of reference numerals is as follows:
Microprocessor 1
Input/output end port unit 11
Instruction decoding control module 13
Analog/digital conversion unit 16
Register main chip 2
CPU (central processing unit) 21
Coding and decoding unit 23
Pre-process unit 24
Store and disk control module 25
General I/O unit 27
The general I/O first pin position 271
General I/O crus secunda position 272
General I/O tripod position 273
Input/output end port group 3
I/O pin position signal 31
Twin wire synchronized model serial I/O group 4
Serial data SDA signal 42
Embodiment
In order to make purpose of the present invention, feature and characteristics obtain more deep and concrete understanding, do a detailed description below in conjunction with embodiment and accompanying drawing.
At first see also shown in Figure 1ly, be system architecture synoptic diagram of the present invention.The present invention uses a microprocessor 1, this microprocessor 1 can be connected on the inner main chip 2 of a DVD videocorder, this connection is that this microprocessor 1 uses I/O group pin position 3 signals and the inner main chip 2 of this DVD videocorder to link up, and uses twin wire synchronized model serial I/O group 4 signals that this microprocessor 1 and the inner main chip 2 of this DVD videocorder are connected to each other transmission signals.
See also shown in Figure 2ly, be internal system circuit block diagram of the present invention.This microprocessor 1 inside of the present invention is provided with an input/output end port unit 11, at least one timing unit 12, an instruction decoding control module 13, at least one storage unit 14, a file register unit 15 and an analog/digital conversion unit 16.
Wherein also comprise a serial in this input/output end port unit 11 and pin the I/O pin position signal 31 of SCL (Serial Clock) signal 41, serial datum SDA (Serial Data) signal 42 and an output.This serial pinning SCL (Serial Clock) signal 41 and this serial data SDA (SerialData) signal 42 are the signals for two pin positions of twin wire synchronized model serial I/O group 4 signals, pin SCL signal 41 potential change when (transferred to electronegative potential or transferred to noble potential by electronegative potential by noble potential) when this serial, the inner main chip 2 of this processor 1 and this DVD videocorder just can be connected to each other and transmit data by this serial data SDA signal 42.This I/O pin position signal 31 is to export the inner main chip 2 of this DVD videocorder to by this microprocessor 1, instruction decoding control module 13 by this microprocessor 1 is assigned the I/O instruction, arrive the inner main chip 2 of this DVD videocorder via this input/output end port unit 11, so that the inner main chip 2 of this DVD videocorder is carried out specific I/O action.
Wherein the timing unit 12 of this microprocessor 1 also comprises a timer and a power supply Active Timer, and the storage unit 14 of this microprocessor 1 also comprises a high-speed cache and a data-carrier store, and this data-carrier store stores the byte that this microprocessor 1 is produced.
Please continue to consult shown in Figure 2, the inner main chip of this DVD videocorder of the present invention 2 inside are provided with a CPU (central processing unit) 21, an image post-processing unit 22, at least one coding and decoding unit 23, a pre-process unit 24, storage and disk control module 25, a system control unit 26 and a general I/O unit 27.
Comprise also in this general I/O unit 27 that wherein three receive the pin position, the I/O pin position signal 31 that one serial pinning SCL (Serial Clock) signal 41 receives pin positions, serial datum SDA (Serial Data) signal 42 reception pin positions and an input end receives the pin positions, and its action is to receive the signal of being sent by this microprocessor 1 also will to respond to this microprocessor 1 in the result that the inner main chip of this DVD videocorder is produced.
Wherein this coding and the decoding unit 23 of the inner main chip 2 of this DVD videocorder comprise general audio-visual body coder/decoder.This audio-visual coder/decoder has the coding/decoding function of sound and image.It is to be TV (for simulating signal) image coder that this image post-processor unit 22 comprises a NTSC/PAL scrambler (TV Encoder).Wherein NTSC is the television image specification system of U.S. RCA Corp. exploitation, and PAL is the television image specification system (general Europe rule) of German moral rule wind root company exploitation.
The implementation step of the method for the circuit of the DVD videocorder with copy-proof function of the present invention and protection firmware is as follows:
See also shown in Figure 3ly, be the schematic flow sheet of anti-copy program of the present invention, at first, this microprocessor 1 produces three bytes earlier and sends in this data-carrier store of internal memory 14 of this microprocessor 1, and gives the inner main chip 2 of this DVD videocorder and go to read.The inner main chip 2 of this DVD videocorder is that the signal by two pin positions in the general I/O unit 27 transmits data, and these two signals be this serial pinning SCL (Serial Clock) signal 41 and this serial data SDA (Serial Data) signal 42 of these twin wire synchronized model serial I/O group 4 signals.The first pin position 271 that SCL signal 41 is connected to the general I/O 27 of the inner main chip 2 of this DVD videocorder is pinned in this serial, and this serial data SDA signal 42 is connected to the crus secunda position 272 of the general I/O 27 of the inner main chip 2 of this DVD videocorder.When this serial pinning SCL signal 41 current potentials change, the change of its current potential is to be transferred to electronegative potential or transferred to the state of noble potential by electronegative potential by noble potential, this serial data SDA signal 42 will read this three bytes in this data-carrier store of the storage unit 14 of this microprocessor 1, and whether being returned to the inner main chip 2 of this DVD videocorder, to detect this three byte correct.First byte of this of this three byte is the identification code for this microprocessor 1 special use, this identification code is certain hexadecimal numerical value, this second byte is the number of times that the inner main chip 2 of this microprocessor 1 and this DVD videocorder is linked up, the 3rd byte is a random value that is produced for this microprocessor 1, arbitrarily value is to be certain hexadecimal numerical value, if when this microprocessor 1 can't produce random value automatically, can use the counter of this microprocessor 1 inside to calculate and obtain this random value.
After the inner main chip 2 of this DVD videocorder is received these three bytes, check these three bytes of receiving earlier, check whether this first byte is correct, if mistake then these three bytes of the inner main chip 2 not loopbacks of this DVD videocorder is given this microprocessor 1, this microprocessor 1 will send once these three bytes to give this DVD videocorder inner main chip 2 again after timing about 2 seconds, check whether this first byte of sending specifically is correct, if this first byte of being received is correct, continue to receive two other byte so, these three bytes of loopback are to this microprocessor 1 then.This first byte of receiving these three bytes is the identification code of the inner main chip 2 of this DVD videocorder, this identification code is certain hexadecimal numerical value, this second byte is the number of times of linking up for the inner main chip 2 of this microprocessor 1 and this DVD videocorder, the random value that the 3rd byte produced for this microprocessor 1, arbitrarily value is certain hexadecimal numerical value, because of random value is difficult for producing, then can does one and obtain this random value with door (AND) computing by Chip counters (Timer) in the inner main chip 2 of this DVD videocorder.For example: chip_risc_timer﹠amp; 0xff, wherein this chip_risc_timer is a micro-order, and its action instructs the arbitrary value that reads counter and a 0xff to do computing with door for calling out this, and this 0xff is a hexadecimal numerical value (the conversion decimal system is numeral 255).
Continue to carry out step S100 to S110 among Fig. 3 at least once above (for example: 3 times, 4 times ... .), if when finding not have mistake (error) to take place, the function of normal broadcast (playback) and record (record) can be arranged then.If during the still wrong generation of result of counting, this microprocessor 1 will be sent the tripod position 273 that a high-potential voltage signal is given the general I/O 27 of the inner main chip 2 of this DVD videocorder via the pin position of digital I/O pin position signal 31, otherwise pin position that should numeral I/O pin position signal 31 is sent a low-potential voltage signal and is given this DVD videocorder inner main chip 2, judge by the current potential of this I/O pin position signal 31 is high or low whether the inner main chip 2 of this DVD videocorder is legal, if signal potential judges that the inner main chip 2 of this DVD videocorder is pirates according to this, then has only the function of broadcast and non-registered function.If pirate, then only can be in certain unit interval (for example: 30 minutes, 1 hour ... .) writing function is arranged, all the other all have only playing function.
Therefore, the present invention provides a kind of far different in the design of prior art by above-mentioned disclosed technology, can improve the use value of DVD videocorder integral body afterwards.
Yet, above-mentioned disclosed accompanying drawing with specify, only be the embodiment of for reference and explanation use of the present invention, be not to be used for the present invention is limited.All those skilled in the art be when can doing other all improvement according to above-mentioned explanation, and these change in the claim that still belongs to claims of the present invention and defined.
Claims (6)
1. the guard method with DVD videocorder of copy-proof function is characterized in that, is to reach by the main chip that a microprocessor connects a DVD videocorder inside, and this method comprises the following steps: at least
(a) with three bytes store that this microprocessor produced in an impact damper, this impact damper is positioned at a data-carrier store of this microprocessor;
(b) read this three bytes of being stored in this impact damper and these three bytes are sent in the main chip of this DVD videocorder inside;
(c) check first byte mistake whether these three bytes in this impact damper, read;
When (d) this first byte check is correct, continue to receive other two bytes in these three bytes;
(e) three bytes that this DVD videocorder is produced are sent back to this microprocessor;
(f) repeatedly carry out above-mentioned steps (a) to (e), whether correct with these three bytes of carrying out being stored in this impact damper of repeated detection; And
(g) when the test results is yes, the main chip of promptly judging this DVD videocorder inside is legal and is that writing function is arranged, if testing result for not the time, judges that then the main chip of this DVD videocorder inside is pirate, thereby the function of broadcast is only arranged and unwritten function.
2. the guard method with DVD videocorder of copy-proof function as claimed in claim 1; it is characterized in that; this first byte of these three bytes that this microprocessor produced is an identification code of this microprocessor special use; this second byte is the inner main chip of DVD videocorder and a number of this microprocessor communication, and the 3rd byte is a random value.
3. the guard method with DVD videocorder of copy-proof function as claimed in claim 2 is characterized in that this identification code is a sexadecimal numerical value, and this arbitrarily is worth is sexadecimal numerical value.
4. the guard method with DVD videocorder of copy-proof function as claimed in claim 1; it is characterized in that; check in the step at this; when this first byte is wrong; after then waiting for a schedule time, get back to the step that reads in these three bytes of being stored in this impact damper and the main chip that these three bytes is sent to this DVD videocorder inside.
5. the guard method with DVD videocorder of copy-proof function as claimed in claim 1; it is characterized in that; this receiving step is meant that when this first byte is correct the main chip of this DVD videocorder inside continues to receive this second byte and the 3rd byte in the impact damper of this microprocessor.
6. the guard method with DVD videocorder of copy-proof function as claimed in claim 1 is characterized in that, this sends step back to is that the main chip of this DVD videocorder inside returns to this microprocessor with these three bytes that this DVD videocorder produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101027982A CN1301502C (en) | 2003-10-24 | 2003-10-24 | Method for protecting DVD recording playback machine with anticopying function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101027982A CN1301502C (en) | 2003-10-24 | 2003-10-24 | Method for protecting DVD recording playback machine with anticopying function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1609961A CN1609961A (en) | 2005-04-27 |
| CN1301502C true CN1301502C (en) | 2007-02-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101027982A Expired - Fee Related CN1301502C (en) | 2003-10-24 | 2003-10-24 | Method for protecting DVD recording playback machine with anticopying function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1301502C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2340968A (en) * | 1998-05-15 | 2000-03-01 | Dilla Limited C | Preventing circumvention of copy protaction |
| JP2000207833A (en) * | 1999-01-14 | 2000-07-28 | Sharp Corp | Recording/reproducing device and automatic vending machine |
| CN1347523A (en) * | 1999-03-19 | 2002-05-01 | 戴克斯特公司 | Secure portable digital data handling medium, and security method using such data handling medium |
| JP2002175663A (en) * | 2000-12-06 | 2002-06-21 | Nec Yonezawa Ltd | Copyright protecting and recording method for optical disk |
-
2003
- 2003-10-24 CN CNB2003101027982A patent/CN1301502C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2340968A (en) * | 1998-05-15 | 2000-03-01 | Dilla Limited C | Preventing circumvention of copy protaction |
| JP2000207833A (en) * | 1999-01-14 | 2000-07-28 | Sharp Corp | Recording/reproducing device and automatic vending machine |
| CN1347523A (en) * | 1999-03-19 | 2002-05-01 | 戴克斯特公司 | Secure portable digital data handling medium, and security method using such data handling medium |
| JP2002175663A (en) * | 2000-12-06 | 2002-06-21 | Nec Yonezawa Ltd | Copyright protecting and recording method for optical disk |
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| Publication number | Publication date |
|---|---|
| CN1609961A (en) | 2005-04-27 |
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Granted publication date: 20070221 Termination date: 20131024 |