CN1343932A - Method and appts. for preventing illegal copying digit, data - Google Patents
Method and appts. for preventing illegal copying digit, data Download PDFInfo
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- CN1343932A CN1343932A CN 00128648 CN00128648A CN1343932A CN 1343932 A CN1343932 A CN 1343932A CN 00128648 CN00128648 CN 00128648 CN 00128648 A CN00128648 A CN 00128648A CN 1343932 A CN1343932 A CN 1343932A
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Abstract
A method and device for preventing illegal copy of digital data is disclosed. The said device is composed of I/O interface, memory for storing the digital data, and controller between the said I/O interface and memory. As the illegal copy needs continuous read-out of digital data, the controller can examine if the current instruction is a continuous read-out one and can stop the data output according to the data amount read out continuously and the interval time after read operation.
Description
The present invention relates to the method and apparatus of the preventing from illegal duplication of numerical data, be meant especially and utilize the characteristic of reading continuously in the bootlegging process to prevent that numerical data is by the method and apparatus of bootlegging.
Digital music is very popular in recent years, wherein has the advantage of high compression rate and high tone quality again with MP3 (MPEG Audio Layer3), is current most popular digital music standard.And a kind of walkman (walkman) that is used for playing MP 3 music standards specially also is developed thereupon, becomes quite welcome electronic product.Wherein the MP3 music is to be stored in the storage card, utilizes the MP3 walkman to play back.
Yet, because the MP3 music data is a digital form, be replicated very easily, and storage card very easily by bootlegging, thereby causes musician and distributing and releasing corporation's considerable damage not at the safeguard measure that prevents to duplicate at present.This also is simultaneously the main cause of the popularization of restriction MP3 music.
As for the data of digital forms such as other various sound, image, audio-visual, data, face similarly easily by the puzzlement of bootlegging, therefore, be necessary to propose improvement preferably, in the hope of perfect at this difficult problem.
Fundamental purpose of the present invention is promptly at the method and apparatus that proposes a kind of numerical data preventing from illegal duplication, this method and apparatus utilizes a supervisory circuit to detect sense order or control signal, the process of reading when the observation circuit recognition data is different from general normal readout mode, just initiatively stop storer and read data or destroy the bootlegging operation, to prevent that numerical data is by bootlegging.
Another object of the present invention is the method and apparatus that proposes a kind of numerical data preventing from illegal duplication, its pattern of normally reading according to numerical data preestablishes Rule of judgment, and the process of reading when data does not meet these preset condition and just stops data output or destroy the bootlegging operation.
A further object of the present invention is the method and apparatus that proposes a kind of numerical data preventing from illegal duplication, it utilizes the characteristic of reading continuously in the bootlegging numerical data process, whether the instruction that monitoring is read reads continuously, the perhaps data volume of the data that read in the process of read operation each time, perhaps the stand-by time after the read operation is judged, and then whether decision stops data output or destroy bootlegging work.
In order to realize above-mentioned purpose of the present invention, according to the first string of the present invention, provide a kind of numerical data that prevents by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and produce the numerical data that control signal is read this memory storage, through an input/output interface output, this method comprises the following steps: again
Detect sense order or this control signal, read continuously judging whether; And
If the judged result of previous step is to read continuously, then destroy this read operation.
In order to realize above-mentioned purpose of the present invention, according to second scheme of the present invention, provide a kind of numerical data that prevents by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and produce the numerical data that control signal is read this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) calculate the data data volume that read operation is read;
(b) relatively whether this data volume meets the condition of preset data weight range; And
(c) when the comparative result of (b) step for not meeting the preset data weight range, then destroy this read operation.
In order to realize above-mentioned purpose of the present invention, according to the 3rd scheme of the present invention, provide a kind of numerical data that prevents by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and produce the numerical data that control signal is read this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) stand-by time in the calculating read operation process;
(b) relatively whether this stand-by time meets the condition of preset stopping time range; And
(c) when the comparative result of (b) step for not meeting the preset stopping time range, then destroy this read operation.
In order to realize above-mentioned purpose of the present invention, according to the 4th scheme of the present invention, provide a kind of numerical data that prevents by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and produce the numerical data that control signal is read this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) whether detect the instruction read or this control signal for reading continuously;
(b) when the result of above-mentioned (a) step for being, then carry out (c) step, otherwise, then carry out (d) step;
(c) destroy this time read operation;
Whether (d) detect read operation stops;
(e) if the result of above-mentioned (d) step is not shut-down operation, just add up the data volume that this read operation is read, and compare with a critical value of presetting, this critical value is the maximal value that goes out read operation data streams read data volume under the mode of operation according to normal read;
(f) when the comparative result of above-mentioned (e) step be the read operation data volume of reading greater than this critical value, just carry out (c) step;
(g) if the result of above-mentioned (d) step is shut-down operation, just calculate the data data volume that this time read operation is read;
(h) compare according to above-mentioned (g) step result calculated and a preset data amount interval, wherein this preset data amount interval is the normal range that goes out the data volume of read operation data streams read under the mode of operation according to normal read;
(i) when above-mentioned (g) step result calculated not in the scope in this preset data amount interval, just carry out (c) step;
(j) drop in the scope in this preset data amount interval when above-mentioned (g) step result calculated, just carry out next step;
(k) calculate stand-by time after this time read operation; And
(1) result of calculation and the Preset Time interval according to above-mentioned (k) step compares, wherein this Preset Time interval is to go out the stand-by time in the read operation process under the mode of operation according to normal read, if the result of calculation of above-mentioned (k) step is just carried out (c) step not in the scope in this Preset Time interval.
In order to realize above-mentioned purpose of the present invention, according to the 5th scheme of the present invention, provide a kind of numerical data preventing from illegal duplication device, comprising:
An input/output interface provides with the outside to be connected;
Storer, wherein a store digital data;
A control circuit produces control signal to read the numerical data of this memory stores, again via this input/output interface output; And
A supervisory circuit links to each other with this storer thrin with this input/output interface, this control circuit at least, reads by judging storer whether the mode of operation of data is the mode of operation of normally reading, so that whether decision destroys read operation.
Specific embodiment below utilizing cooperates appended Figure of description to describe the effect that is more readily understood purpose of the present invention, technology contents, characteristics and is realized.
Fig. 1 represents the synoptic diagram of MP3 storage card internal circuit configuration in the prior art;
When Fig. 2 presentation graphs 1 shown device is worked under the normal play music pattern, the waveform synoptic diagram of its internal circuit signal;
Fig. 3 be device shown in Figure 1 when being replicated, the waveform synoptic diagram of its internal circuit signal;
Fig. 4 is that the numerical data that prevents according to the present invention is by an embodiment of bootlegging;
Fig. 5, Fig. 6, Fig. 7 and Fig. 8 are respectively according to the present invention and prevent that numerical data is by the operational flowchart of the embodiment of the method for bootlegging.
Main feature of the present invention is to utilize numerical data, sound for example, and animation, image, perhaps Video-audio data, in the difference of normal play readout with by bootlegging the time whether to distinguish by illegally Copy, and then determine whether read operation to be interrupted or to destroy the operation of bootlegging.
Before introducing detailed technology content of the present invention, earlier take MP3 music standard as the example simple explanation The process of read operation when the composition of MP3 storage card and normal play music in the prior art.
Fig. 1 represents the composition of MP3 storage card in the prior art, comprising input/output interface 12, and decoding and control circuit 14 and storer 16, the three interconnects.Storer 16 is used for the store digital music data, and input/output interface 12 is accepted outside sense order, decodes and produces control signal via decoding and control circuit 14 and read music data from storer 16, is read by input/output interface 12 at last.
Storage card is under the situation of normal play music, the waveform system of its inner each circuit signal as shown in Figure 2, wherein decoding and control circuit 14 produced when reading enable signal (RE) for low level state (low), input/output interface 12 has data to read, after finishing the operation of partly reading, just stop a period of time, and then proceed the read operation of next part.
And storage card is under situation about being replicated, and the waveform of its inner each circuit signal is then different with Fig. 2, sees also shown in Figure 3ly, and it is continuous wherein reading enable signal, and input/output interface 12 has data output constantly, and this expression read operation is to carry out constantly.Readout when this phenomenon and storage card normal play music has evident difference, mainly be because the digital music data of reading during playing back music must just play back through reduction and follow-up treatment step, therefore its process is to read one piece of data just to stop a period of time, so carrying out repeatedly.And the process of duplicating storage card only is that digital music data is duplicated, and do not need through handling procedures such as conversion or reduction, so its read operation is carried out continuously.
For other sound, animation, image, reach numerical datas such as video-audio data, the read operation of its normal play and bootlegging operation all have above-mentioned difference, so the present invention is just according to the difference characteristic of numerical data readout between normal play and bootlegging action, a kind of numerical data that prevents is proposed by the device of bootlegging, as shown in Figure 4, it utilizes and add a supervisory circuit 25 between input/output interface 22 and decoding and control circuit 24 and storer 26, whether unusual in order to the monitoring readout, and then determine that stopping data reading.Wherein as prior art, decoding and control circuit 24 are to be used for the sense order of outside input is decoded, and produce corresponding control signal.In other embodiment, if needn't be through the program of decoding, decoding circuit might be omissible so.
And prevent numerical data as shown in Figure 5 by the method for bootlegging according to the present invention, also can cooperate together reference of Fig. 4.In step S10, send into a sense order via input/output interface 22 outsides, in decoding and control circuit 24 decoding and produce control signal and take out corresponding data by storer 26.Utilize detection sense order or control signal to judge whether being continuous read operation, promptly step S12 judges whether outside this sense order of being sent out carries out the operation of bootlegging.
If detect sense order or control signal for reading continuously, just expression is not in the mode of operation of normally reading, and therefore read operation is interrupted, and promptly jumps to step S13, and stops data output, i.e. step S15.
If step S12 testing result is just then carried out the data volume that step S14 calculates sense data for not, this step can utilize counter to carry out.Wherein can be for example once to read the data volume that action reads during according to normal sense data to preestablish sense data amount reasonable range in supervisory circuit 25.Whether step S16 stops for detecting the action of reading, before the operation of reading does not stop as yet, the data volume of the data of reading in this time of accumulative total readout that supervisory circuit 25 continues, and monitor this result of calculation and whether surpass a critical value, be step S18, wherein the critical value of She Dinging is the maximal value of aforementioned zone of reasonableness, usually during bootlegging based on the consideration of efficient, the data volume that once reads can surpass this critical value.When the data reason that calculates added up above this critical value, just expression was not to be at general normal readout mode at this moment, therefore just skipped to step S13 and S15, read operation is interrupted, and stopped data output.When the result of step S16 for being, i.e. read operation stops, just data volume and the aforesaid zone of reasonableness with this time read operation sense data compares, the data volume of judging sense data whether in the reasonable scope, i.e. step S20.If the result just skips to step S13 and S15 for not, read operation is interrupted, and stopped data output.If by the data volume of storer 26 sense datas in default zone of reasonableness, next just carry out step S22 and calculate the time that stops after the read operation, this step can utilize timer to carry out, wherein can be for example in supervisory circuit 25 according to the zone of reasonableness that preestablishes a stand-by time interval time between the adjacent secondary read operation under the mode of operation of normally reading, so that judge whether the time that action back stopped to be read in this time normal, usually during bootlegging based on the consideration of efficient, reading the time that stops can be shorter.If the result of step S24 just is that expression is not at this moment to be in general normal mode of operation of reading for not, therefore skip to step S13 and S15, read operation is interrupted, and stopped data output.Otherwise, when the result of step S24 for being just to carry out step S26 and judge whether this piece of data of reading finishes.If do not read ED as yet, just counter and timer are made zero, i.e. step S28, and get back to step S14.If data finish,, stop inner each circuit unit operation, no longer output data just skip to step S15.
In the aforesaid process, whether utilize supervisory circuit 25 to detect read operation successively continues to carry out, whether the data volume and the stand-by time in the readout of sense data be normal, determine whether stopping data output, both preestablish rational working range according to the characteristics of the numerical data in the storer 26 under normal readout mode wherein, whether are in the mode of operation of normally reading to differentiate.Do not meet the condition of its setting if find the process read, just read operation is interrupted, stop data and continue output, to prevent that numerical data in the storer 26 is by bootlegging.
Three kinds of above-mentioned judgment modes are independence or permutation and combination utilization distinctly, but uses monitoring flow process shown in Figure 5 to have preferable preventing from illegal duplication effect, utilizes filtration layer by layer, numerical data can be minimized by the chance of bootlegging.Certainly, three kinds of determining steps among Fig. 5 are the modification order according to need, for example step S16 and S18 is exchanged, and its process flow diagram then as shown in Figure 6.
In other embodiment, can also only utilize the situation of storer 26 output datas to judge whether by bootlegging, promptly only utilize aforementioned judge the sense data amount with and the stand-by time of readout whether meet pre-conditioned mode, judge whether that storer is in the mode of operation of normally reading or by bootlegging, its process flow diagram according to Fig. 5 and Fig. 6 makes an amendment the process flow diagram that drawn slightly then respectively as Fig. 7 and shown in Figure 8.
In different embodiment, aforementioned every judgement of reading state, comprise the zone of reasonableness that preestablishes a stand-by time interval time between the adjacent secondary read operation under the mode of operation of normally reading, and the data volume that a read operation is read during according to normal sense data preestablishes sense data amount reasonable range, can also utilize software or hardware mode to carry out.
If utilize the mode of microcontroller to monitor and utilize available circuit operation according to the present invention, then can simplify supervisory circuit 25 widely.
The data volume of above-mentioned reading of data or the zone of reasonableness of stand-by time can preestablish according to need.And different numerical data standards is (as MPEG, JPEG......), different data categories (sound for example, music, image, audio-visual ...) or different application, its preset value is different and different with using, with the music single is example, and different single can also have different preset values, in other words preset value and not exclusive.Therefore can derive various preventing from illegal duplication effect according to the present invention, allow bootlegging person catch to can not touch the mode that cracks of preventing from illegal duplication.
As for of the operation of abovementioned steps S13 fundamental purpose in the destruction bootlegging, so in other embodiment, also not necessarily interrupting data immediately reads, the method of a lot of other interference also can be suitable for, and for example adds mess code and reads, and perhaps makes sense data incomplete, these methods can be by decoding and control circuit 24, the perhaps extra control circuit that adds also can be to utilize software mode to carry out, and therefore can allow bootlegging person can't find its bootlegging result failure for the moment.
Prevent that effectively numerical data from by bootlegging, helping the development of various numerical informations, for example digital music; MP3 for example, MIDI, WAVETABLE; perhaps animation, image, and all kinds of video-audio data all can protection according to the present invention be protected its wisdom crystallization and intention.Especially for the musical composition people, record company, image and sound program publisher, its intellecture property obtains protection fully, makes its remuneration that obtains equity, will help to encourage creation and then the industry of lifting level, and this also is simultaneously the purpose of China's Patent Law legislation.
Claims (24)
1. one kind prevents that numerical data is by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and the generation control signal is read the numerical data of this memory storage, through an input/output interface output, this method comprises the following steps: again
Detect sense order or this control signal, read continuously judging whether; And
If the judged result of previous step is to read continuously, then destroy this read operation.
2. prevent numerical data according to claim 1 by the method for bootlegging, wherein this read operation of this destruction is to interrupt read operation, stops data output.
3. prevent numerical data according to claim 1 by the method for bootlegging, wherein this read operation of this destruction is that the numerical data adding mess code of this storer output is read.
4. prevent numerical data according to claim 1 by the method for bootlegging, wherein this read operation of this destruction is to make sense data incomplete.
5. one kind prevents that numerical data is by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and the generation control signal is read the numerical data of this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) calculate the data data volume that read operation is read;
(b) relatively whether this data volume meets the condition of preset data weight range; And
(c) when the comparative result of (b) step for not meeting the preset data weight range, then destroy this read operation.
6. prevent numerical data by the method for bootlegging as described in claim 5, wherein this read operation of this destruction is to interrupt read operation, stops data output.
7. prevent numerical data by the method for bootlegging as described in claim 5, wherein this read operation of this destruction is that the numerical data adding mess code of this storer output is read.
8. prevent numerical data by the method for bootlegging as described in claim 5, wherein this read operation of this destruction is to make sense data incomplete.
9. prevent numerical data by the method for bootlegging as described in claim 5, the preset data weight range that wherein is somebody's turn to do (b) step comprises a default maximal value at least, and whether the result of calculation that compares (a) step according to this is greater than this maximal value.
10. as described in claim 5, prevent that numerical data is by the method for bootlegging, should (b) step be to preset reasonable interval with the result of calculation and one of (a) step to compare wherein, wherein should be default the normal range of reasonable interval system read operation sense data data volume when normally reading, whether the result of calculation that compares (a) step according to this is positioned at this normal range.
11. one kind prevents that numerical data is by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and the generation control signal is read the numerical data of this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) stand-by time in the calculating read operation process;
(b) relatively whether this stand-by time meets the condition of preset stopping time range; And
(c) when the comparative result of (b) step for not meeting the preset stopping time range, then destroy this read operation.
12. prevent numerical data by the method for bootlegging as described in claim 11, wherein this read operation of this destruction is to interrupt read operation, stops data output.
13. prevent numerical data by the method for bootlegging as described in claim 11, wherein this read operation of this destruction is that the numerical data adding mess code of this storer output is read.
14. prevent numerical data by the method for bootlegging as described in claim 11, wherein this read operation of this destruction is to make the data of reading incomplete.
15. prevent numerical data by the method for bootlegging as described in claim 11, decide the interval time when wherein this preset stopping time range goes out mode of operation according to normal read.
16. one kind prevents that numerical data is by the method for bootlegging, wherein this digital data storage is in a storer, a control circuit is connected with this storer, and the generation control signal is read the numerical data of this memory storage, via an input/output interface output, this method comprises the following steps: again
(a) whether detect the instruction read or this control signal for reading continuously;
(b) when the result of above-mentioned (a) step for being, then carry out (c) step, otherwise, then carry out (d) step;
(c) destroy this time read operation;
Whether (d) detect read operation stops;
(e) if the result of above-mentioned (d) step is not shut-down operation, just add up the data volume that this read operation is read, and compare with a critical value of presetting, this critical value is the maximal value that goes out read operation data streams read data volume under the mode of operation according to normal read;
(f) when the comparative result of above-mentioned (e) step be the read operation data volume of reading greater than this critical value, just carry out (c) step;
(g) if the result of above-mentioned (d) step is shut-down operation, just calculate the data data volume that this time read operation is read;
(h) compare according to above-mentioned (g) step result calculated and a preset data amount interval, wherein this preset data amount interval is the normal range that goes out the data volume of read operation data streams read under the mode of operation according to normal read;
(i) when above-mentioned (g) step result calculated not in the scope in this preset data amount interval, just carry out (c) step;
(j) drop in the scope in this preset data amount interval when above-mentioned (g) step result calculated, just carry out next step;
(k) calculate stand-by time after this time read operation; And
(1) result of calculation and the Preset Time interval according to above-mentioned (k) step compares, wherein this Preset Time interval is to go out the stand-by time in the read operation process under the mode of operation according to normal read, if the result of calculation of above-mentioned (k) step is just carried out (c) step not in the scope in this Preset Time interval.
17. prevent numerical data by the method for bootlegging as described in claim 16, this read operation of destruction of wherein being somebody's turn to do (c) step is to interrupt read operation, stops data output.
18. prevent numerical data by the method for bootlegging as described in claim 16, this read operation of destruction of wherein being somebody's turn to do (c) step is that the numerical data adding mess code of this storer output is read.
19. prevent numerical data by the method for bootlegging as described in claim 16, this read operation of destruction of wherein being somebody's turn to do (c) step is to make the data of reading incomplete.
20. a numerical data preventing from illegal duplication device comprises:
An input/output interface provides with the outside to be connected;
Storer, wherein a store digital data;
A control circuit produces control signal to read the numerical data of this memory stores, again via this input/output interface output; And
A supervisory circuit links to each other with this storer thrin with this input/output interface, this control circuit at least, reads by judging storer whether the mode of operation of data is the mode of operation of normally reading, so that whether decision destroys read operation.
21. numerical data preventing from illegal duplication device as claimed in claim 20, wherein this supervisory circuit comprises that whether detection sense order or control signal are for reading continuously.
22. numerical data preventing from illegal duplication device as claimed in claim 20, wherein this supervisory circuit comprises whether the data volume that detects read operation meets the condition of preset data weight range.
23. numerical data preventing from illegal duplication device as claimed in claim 20, wherein this supervisory circuit comprises whether the stand-by time that detects in the read operation process meets the condition of preset stopping time range.
24. numerical data preventing from illegal duplication device as claimed in claim 20, wherein this supervisory circuit is to utilize software or hardware mode monitoring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00128648XA CN1185583C (en) | 2000-09-19 | 2000-09-19 | Method and appts. for preventing illegal copying digit, data |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB00128648XA CN1185583C (en) | 2000-09-19 | 2000-09-19 | Method and appts. for preventing illegal copying digit, data |
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| CN1343932A true CN1343932A (en) | 2002-04-10 |
| CN1185583C CN1185583C (en) | 2005-01-19 |
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| CNB00128648XA Expired - Fee Related CN1185583C (en) | 2000-09-19 | 2000-09-19 | Method and appts. for preventing illegal copying digit, data |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236606A (en) * | 2010-04-21 | 2011-11-09 | 群联电子股份有限公司 | Storage device, memory controller and data protection method |
| CN101677018B (en) * | 2008-09-16 | 2012-05-23 | 盛群半导体股份有限公司 | Secrecy system of memory and secrecy method for reading in memory burn mode |
| CN102521168A (en) * | 2011-12-16 | 2012-06-27 | 中颖电子股份有限公司 | Data anti-copy method for storage card |
| CN102023934B (en) * | 2009-09-23 | 2013-03-27 | 群联电子股份有限公司 | Data protection method and system, external storage device and storage device controller |
| CN103106354A (en) * | 2011-11-14 | 2013-05-15 | 中颖电子股份有限公司 | Method for limiting protected data in storing device from being copied to personal computer (PC) end |
| US8826461B2 (en) | 2009-09-15 | 2014-09-02 | Phison Electronics Corp. | Method and system for protecting data, storage device, and storage device controller |
| CN113051132A (en) * | 2021-03-30 | 2021-06-29 | 联想(北京)有限公司 | Electronic equipment and control method |
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2000
- 2000-09-19 CN CNB00128648XA patent/CN1185583C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101677018B (en) * | 2008-09-16 | 2012-05-23 | 盛群半导体股份有限公司 | Secrecy system of memory and secrecy method for reading in memory burn mode |
| US8826461B2 (en) | 2009-09-15 | 2014-09-02 | Phison Electronics Corp. | Method and system for protecting data, storage device, and storage device controller |
| CN102023934B (en) * | 2009-09-23 | 2013-03-27 | 群联电子股份有限公司 | Data protection method and system, external storage device and storage device controller |
| CN102236606A (en) * | 2010-04-21 | 2011-11-09 | 群联电子股份有限公司 | Storage device, memory controller and data protection method |
| CN102236606B (en) * | 2010-04-21 | 2014-06-11 | 群联电子股份有限公司 | Storage device, memory controller and data protection method |
| CN103106354A (en) * | 2011-11-14 | 2013-05-15 | 中颖电子股份有限公司 | Method for limiting protected data in storing device from being copied to personal computer (PC) end |
| CN103106354B (en) * | 2011-11-14 | 2017-02-08 | 中颖电子股份有限公司 | Method for limiting protected data in storing device from being copied to personal computer (PC) end |
| CN102521168A (en) * | 2011-12-16 | 2012-06-27 | 中颖电子股份有限公司 | Data anti-copy method for storage card |
| CN113051132A (en) * | 2021-03-30 | 2021-06-29 | 联想(北京)有限公司 | Electronic equipment and control method |
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| Publication number | Publication date |
|---|---|
| CN1185583C (en) | 2005-01-19 |
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