CN102289610A - Offline certificate control and management system and method of digital rights management (DRM) of embedded device - Google Patents
Offline certificate control and management system and method of digital rights management (DRM) of embedded device Download PDFInfo
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- CN102289610A CN102289610A CN2011101520118A CN201110152011A CN102289610A CN 102289610 A CN102289610 A CN 102289610A CN 2011101520118 A CN2011101520118 A CN 2011101520118A CN 201110152011 A CN201110152011 A CN 201110152011A CN 102289610 A CN102289610 A CN 102289610A
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Abstract
The invention provides an offline certificate control and management system and method of digital rights management (DRM) of an embedded device. The system comprises a certificate core summary table so as to store the core data of a corresponding certificate file, wherein the core data include the certificate code, the final using timestamp and the final using times of the certificate file. A DRM time system is used to provide independent DRM time. When the final using timestamp or the final using times stored in the certificate core summary table conforms to the certificate deadline or times within the certificate deadline in the certificate file, the certificate file becomes invalid and the data contents of the corresponding certificate file are not allowed to be used. The system and the method have the following beneficial effects: the DRM time system and the certificate core summary table are arranged in a protected area inside the embedded device, therefore the DRM time system and the certificate core summary table cannot be changed by users, thus putting an end to restoration and backup of the certificate file for reuse.
Description
Technical field
The present invention relates to a kind of embedded device drm certificate control-management system and method thereof, especially a kind of when the embedded device off-line still effectively the embedded device off-line digital copyright management certificate control-management system and the method thereof of keyholed back plate.
Background technology
At present, the digital copyright management of embedded device (DRM/Digital Rights Management), its protected mode adds the mode of certificate of authority file mostly in data content.Data content is encrypted by cryptographic algorithm; the authorization message that the use of then having write down the legal payment of user in the certificate of authority file and having obtained limits; as legal user's information; legal environment for use facility information (Equipment Serial Number etc.); up time limits (before certain date); modes such as spendable number of times are to protect the data content.
Generally online (online) certification authentication mode, in the proof procedure before data content uses, need online authorization center (DRM management server), the user authorizes differentiation by the online authorization center of means of communication before use, if the user can't the on line data authorization center, then can't use data content.General online verification mode, reason authorization center are come strict audit and are write down each user's operating position, and the user can't distort mandate and use information in the server, thereby guarantee authorization information.But all require communication connection during also because of each the use, as in can not implementing online occasion, using very inconvenience.
So off-line (offline) certification authentication mode further occurs.Off-line certification authentication mode is downloaded certificate file or is copied in the equipment that uses terminal in other mode, or certain possesses in the utility appliance of storage capacity, when the user in use, can carry out the record and tracking (the checking up time of authority differentiation and operating position according to certificate file, but access times etc., and finally add up service time and access times).
But mode for off-line (offline), when if the user gets access to the certificate file of certain data content, also carry out the backup of certificate file, especially for the certificate file that the time number limiting pattern is only arranged, because the access times present situation of certificate is stored in the certificate file, behind the state when certificate file is reduced into backup before certificate lost efficacy by the user, just can carry out the use of data content with the certificate of reduction.
In order to prevent the user ID certificate file, some manufacturers use the utility appliance of other tool memory function to carry out the storage of certificate, but because of the extra hardware servicing unit of needs, thereby the increase hardware cost, and the user also makes troubles because will additionally connect utility appliance in use, if and utility appliance is damaged, the user before obtaining new utility appliance, also can't be follow-up tracking situation about using, also can't continue the data content that use authority is crossed.
Summary of the invention
The above-mentioned technical matters of the present invention for existing in the solution background technology, and embedded device off-line digital copyright management certificate control-management system and method thereof are proposed.
Technical solution of the present invention is: the present invention is a kind of embedded device off-line digital copyright management (Digital Right Management) certificate control-management system, its special character is: this system comprises: the digital copyright management time system, be arranged in the protection zone in the embedded device, the digital copyright management time system provides the independently digital copyright management time; Certificate core abstract is arranged in the protection zone, and connects digital publishing rights system's administrative time, is used for storing core data; Certificate file gives embedded device by the granting of certificate keyholed back plate center, and certificate file comprises certificate number, duration of certificate time and duration of certificate number of times, and certificate file is to there being data content; Processing unit, connect this digital copyright management time system and certificate core abstract, and when embedded device is enabled data content, obtain certificate number, record is to stab last service time when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number, and with certificate number, service time, stamp and last access times three were combined as core data at last, be stored in the certificate core abstract again strip columnwise, when embedded device uses data content during at off-line, processing unit contrast certificate file and certificate core abstract content; Wherein, stab the duration of certificate time that meets certificate file when last service time, or last access times are when meeting the duration of certificate number of times, certificate file is stopped using, and data content is also stopped using.
Above-mentioned embedded device comprises authentication unit, and authentication unit is arranged in the embedded device, and grasps the verification msg be stored in comparison proof data the protection zone in, when prove the data fit verification msg then certificate file enable; Wherein, prove that data submit the certificate keyholed back plate center of giving to by embedded device.
Above-mentioned certificate file comprises certificate reference time, certificate reference time is early than the duration of certificate time, when embedded device is enabled data content for the first time, be slower than certificate reference time administrative time as digital version power, then processing unit is adjusted the digital copyright management time and is met certificate reference time.
The storage area of above-mentioned certificate core abstract is for fixing, and when the storage area was full by the core data storage, processing unit replaced more preceding very early time core data service time with the most recent core data.
Above-mentioned core data saves as the search tree structure with strip columnwise in certificate core abstract, and processing unit is retrieved in search tree according to certificate number.
A kind of embedded device off-line digital copyright management certificate control and management method, its special character is: the method includes the steps of:
1) preparation process for embedded device is provided, has digital copyright management time system, certificate core abstract and processing unit in the embedded device;
2) obtain certificate file and data content step, for embedded device obtains certificate file and corresponding data content by the certificate issued center, wherein, certificate file comprises certificate number, duration of certificate time and duration of certificate number of times;
3) obtain the certificate number step, enable data content for the first time when embedded device, processing unit promptly obtains certificate number;
4) the record certificate number is used the course step, be to stab last service time with the processing unit record when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number;
5) store the core data step, stabbing processing unit combination certificate number, last service time and last access times are core data, and it is stored in certificate core abstract with strip columnwise;
6) search the certificate number step, when embedded device was enabled data content once more, processing unit was target with the certificate number, searched certificate core abstract and whether contained certificate number;
7) contrast certificate file and core data step, when certificate core abstract contains certificate number, then processing unit comparison certificate file and the core data that comprises certificate number;
8) when certificate file be time limit during the keyholed back plate pattern, stab and meet duration of certificate during the time when last service time, then certificate file is stopped using, data content is also stopped using;
9) when certificate file was number of times keyholed back plate pattern, when last access times met the duration of certificate number of times, then certificate file was stopped using, and data content is also stopped using.
Said method comprises verification step 10), this step comprises:
10.1) embedded device submits to the proof data to give certificate keyholed back plate center;
10.2) the anti-additional proof data of this certificate keyholed back plate center proof in certificate file, give embedded device with the certificate file granting when embedded device obtains certificate file;
10.3) authentication unit comparison is stored in the whether certificate of compliance data of verification msg of the protection zone in the embedded device;
10.4) if meet, then certificate file is enabled and embedded device obtains certificate number;
10.5) if do not meet, then online validation is carried out at the online certificate keyholed back plate of embedded device center again.
Said method comprises digital copyright management time set-up procedure 11), this step comprises:
11.1) whether the processing unit comparison be slower than the certificate reference time in the certificate file digital copyright management time;
11.2) if the digital copyright management time is slower than certificate reference time, then processing unit is adjusted the digital copyright management time and met certificate reference time.
Above-mentioned certificate reference time is early than the duration of certificate time.
Said method comprises off-line registration step 12), this step comprises:
12.1) whether the comparison certificate number be present in the content of certificate core abstract;
12.2) if do not exist, then processing unit obtains certificate number, and record is to stab last service time when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number.
By setting of the present invention and use, can't change the certificate core abstract that stores core data because of the user, once comparison, can learn whether certificate file is legal obtaining, so can't in this embedded device, re-use even certificate file is replicated also.And the present invention uses does not need other utility appliance simply again, can also stop the backup-and-restore of off-line certificate file in effective time.And along with present jumbo storage medium capacity is increasing, and under the situation of more and more popularizing, the protection zone of embedded device institute is desirable that a space also increases thereupon, thus can according to application need with the tracking time of certificate file can design longer.
Description of drawings
Fig. 1 is the first embodiment synoptic diagram of embedded device off-line digital copyright management certificate control-management system of the present invention;
Fig. 2 is the second embodiment synoptic diagram of embedded device off-line digital copyright management certificate control-management system of the present invention;
Fig. 3 is the process flow diagram of embedded device off-line digital copyright management certificate control and management method of the present invention;
Fig. 4 is verification step process flow diagram among the present invention;
Fig. 5 is digital copyright management time set-up procedure process flow diagram among the present invention;
Fig. 6 is off-line registration step process flow diagram among the present invention.
Wherein, 1-embedded device off-line digital copyright management certificate control-management system, 10-embedded device, the 101-protection zone, 2-digital copyright management time system, 21-manages the copyright time, 3-certificate core abstract, 30-core data, the most recent core data of 301-, 302-very early time core data, 31-stabs the last access times of 32-, 4-processing unit last service time, the 5-certificate file, the 51-certificate number, 52-duration of certificate time, 53-duration of certificate number of times, 54-certificate reference time, 6-certificate keyholed back plate center, 7-data content, 8-authentication unit, the 81-verification msg, 82-proves data;
Embodiment
Referring to Fig. 1, embedded device off-line digital copyright management certificate control-management system 1 comprises digital copyright management time system 2, certificate core abstract 3, processing unit 4 and certificate file 5.Wherein digital copyright management time system 2, certificate core abstract 3 are arranged in the protection zone 101 in the embedded device 10; the closed region of this protection zone 101 for the storage element in the script embedded device 10 is marked off; the user do not open to the outside world, so can't change the content in the protection zone 101.Digital copyright management time system 2 provides the independently digital copyright management time 21, and the digital copyright management time 21 is adjusted by certificate file 5 only.Certificate file 5 is provided by certificate keyholed back plate center 6 and is given embedded device 10.Certificate bag 5 contains certificate number 51, duration of certificate time 52 and duration of certificate number of times 53, and certificate file is to there being data content 7.Embedded device 10 connects certificate keyholed back plate center 6 by network, when embedded device 10 for (refer to the legal payment of user and authorization message that the use of obtaining limits) normally obtain data content 7 time, the certificate file 5 that corresponding data content 7 will be provided in certificate keyholed back plate center 6 gives embedded device 10.The certificate file 5 that gets access to is stored in the embedded device 10.When embedded device 10 is enabled data content 7, processing unit 4 obtains certificate number 51, and the digital copyright management time 21 of record when 51 uses of time certificate number stab 31 for last service time, and record is last access times 32 when the access times of time certificate number 51, and with stab certificate number 51, last service time 31 and last access times 32 threes be combined as core data 30, again with its strip columnwise be stored in the certificate core abstract 3, form search tree structure (as RBTree).
Before embedded device 10 uses data contents 7, processing unit 4 will be a keyword with certificate number 51, search and compare its content in certificate file 5 that embedded device 10 is obtained and certificate core abstract 3.If stabbed for 31 52 o'clock duration of certificate times that meet in the certificate file 5 last service time, certificate file 5 is stopped using, and data content 7 also can't re-use simultaneously; Or last access times 32 are when meeting duration of certificate number of times 53, and certificate file 5 is stopped using, and data content 7 also can't re-use simultaneously.In the present embodiment, certificate file 5 also comprises certificate reference time 54, when embedded device 10 is enabled data content 7 for the first time, be slower than certificate reference time 54 administrative time 21 as digital version power, then processing unit 4 carries out the adjustment of digital copyright management time 21, makes it meet certificate reference time 54.A certificate file 5 can only be adjusted the digital copyright management time 21 at most one time, and have only when adjusting the digital copyright management time 21 and just can adjust when being slower than certificate reference time of describing in the certificate file 5 54, be adjusted without authorization to stop to manage the copyright time 21, so guarantee 5 of free certificate files that limits in official hour effectively.
When certificate core abstract 3 storage is full, processing unit 4 with LUR (Least Recently Used) principle will the most recent core data 301 (scheming not formula) the earliest very early time core data 302 (scheming not formula) between the replacement operating period.Very early time core data 302 stabs 31 core data 30 the last service time of service time the earliest for having.
Referring to Fig. 2, embedded device 10 also comprises authentication unit 8, still has verification msg 81 in protection zone 101; authentication unit 8 can grasp verification msg 81; and comparison proof data 82 and verification msg 81, when proof data 82 met verification msg 81, certificate file 5 just can be enabled.Proof data 82 for embedded device 10 with before obtaining data content 7 normally, the data of submitting to certificate keyholed back plate center 6, are provided and embedded device 10 its counter being additional in the certificate file 5 together by certificate keyholed back plate center 6.When proof data 82 do not meet verification msg 81, then need online certificate keyholed back plate center 6, reaffirm the proof data 82 that embedded device 10 is submitted to.Wherein verification msg 81 and proof data 82 can be unit type, user ID also or other recognizable user's data.
The third embodiment of the present invention (scheming not formula) is applicable to the certificate file 5 of time keyholed back plate pattern.The certificate core abstract 3 that utilization can not be changed by the user, the time of presetting certificate file 5 with its storage area.Suppose that be 3 minutes the effective time that setting certificate number 51 reads in certificate file 5, then every through 3 minutes, processing unit 4 promptly needs obtaining certificate number 51 one time again.The size of supposing core data 30 again is 32 bytes, and certificate core abstract 3 has 3M storage headspace, and then the maximum clauses and subclauses of holding of certificate core abstract 3 are 100,000, and it is 5000 hours that a certificate core abstract 3 can allow service time.After the storage area of certificate core abstract 3 fills up, 5 calcellations of this certificate file.When another certificate file 5 of upgrading again, processing unit 4 replaces very early time core datas 302 according to the LUR principle with the most recent core data 301, reuses certificate core abstract 3.
Referring to Fig. 3, the process flow diagram of embedded device off-line digital copyright management certificate control and management method of the present invention.Its step system comprises:
The S10 preparation process: embedded device is provided, in have digital copyright management time system, certificate core abstract and processing unit;
S11 obtains certificate file and data content step: embedded device obtains certificate file by the certificate issued center, certificate file corresponding data content, and certificate file comprises certificate number, duration of certificate time and duration of certificate number of times;
S12 obtains the certificate number step: embedded device is enabled data content for the first time, and processing unit obtains the certificate number of the certificate file of corresponding this data content;
S13 record certificate number is used the course step: it is to stab last service time that processing unit writes down when the digital copyright management time that time certificate number is used simultaneously, and record is last access times when the access times of time certificate number;
S14 stores the core data step: processing unit combination certificate number, last service time stab and last access times are core data, and with its strip columnwise be stored in certificate core abstract;
S15 searches the certificate number step: when embedded device was enabled data content once more, processing unit was searched certificate core abstract and whether is contained certificate number according to certificate number;
If then enter S16;
If not, then get back to S11;
S16 contrast certificate file and core data step: processing unit comparison certificate file and the core data that comprises certificate number, to stop using if meet then certificate file, data content is also stopped using.
Wherein, certificate file is time limit during the keyholed back plate pattern, stabs or meets the duration of certificate time when last service time, and then certificate file is stopped using, and data content is also stopped using;
Or when certificate file was number of times keyholed back plate pattern, when last access times meet the duration of certificate number of times, then certificate file was stopped using, and data content is also stopped using.
Embedded device off-line digital copyright management certificate control and management method of the present invention also comprises verification step, and referring to Fig. 4, its step comprises:
The S20 embedded device submits to the proof data to give certificate keyholed back plate center;
Data are counter is additional in the certificate file for S21 certificate keyholed back plate center proof, and send to embedded device;
The S22 authentication unit is compared the whether certificate of compliance data of verification msg in the protection zone that is stored in embedded device;
If meet, then enter S23;
If do not meet, then get back to S20, the online certificate keyholed back plate of embedded device center is verified again;
The S23 embedded device is enabled certificate file and is obtained certificate number.
The off-line digital copyright management certificate control and management method of embedded device of the present invention also comprises digital copyright management time set-up procedure, and referring to Fig. 5, this step is:
Certificate reference time and digital copyright management time in the S30 comparison certificate file;
If the digital copyright management time is later than certificate reference time, then enter S31;
If the digital copyright management time is then got back to S12 early than certificate reference time;
Time adjustment unit in the S31 certificate file is adjusted the digital copyright management time to meet certificate reference time.
Above-mentioned certificate comprises the duration of certificate time early than certificate file reference time.And when certificate core abstract storage was full, processing unit will the most recent core data replaces between the operating period the earliest very early time core data with LUR (Least Recently Used) principle.Core data saves as the search tree structure with strip columnwise in certificate core abstract, and processing unit is that keyword is retrieved in search tree with the certificate number.
Embedded device off-line digital copyright management certificate control and management method of the present invention wherein also comprises the off-line registration step, and referring to Fig. 6, this step is:
Whether S40 comparison certificate number exists in the content of certificate core abstract;
If not, then enter S41;
The S41 processing unit obtains certificate number, and the digital copyright management time of record when time certificate number is used be to stab last service time, and record is last access times when the access times of inferior certificate number.
If then enter S13.
Claims (10)
1. embedded device off-line digital copyright management (Digital Right Management) certificate control-management system, it is characterized in that: this system comprises: the digital copyright management time system, be arranged in the protection zone in the embedded device, the digital copyright management time system provides the independently digital copyright management time; Certificate core abstract is arranged in the protection zone, and connects digital publishing rights system's administrative time, is used for storing core data; Certificate file gives embedded device by the granting of certificate keyholed back plate center, and certificate file comprises certificate number, duration of certificate time and duration of certificate number of times, and certificate file is to there being data content; Processing unit, connect this digital copyright management time system and certificate core abstract, and when embedded device is enabled data content, obtain certificate number, record is to stab last service time when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number, and with certificate number, service time, stamp and last access times three were combined as core data at last, be stored in the certificate core abstract again strip columnwise, when embedded device uses data content during at off-line, processing unit contrast certificate file and certificate core abstract content; Wherein, stab the duration of certificate time that meets certificate file when last service time, or last access times are when meeting the duration of certificate number of times, certificate file is stopped using, and data content is also stopped using.
2. a kind of embedded device off-line digital according to claim 1 copyright management (Digital Right Management) certificate control-management system, it is characterized in that: described embedded device comprises authentication unit, authentication unit is arranged in the embedded device, and grasp the verification msg be stored in comparison proof data the protection zone in, when prove the data fit verification msg then certificate file enable; Wherein, prove that data submit the certificate keyholed back plate center of giving to by embedded device.
3. a kind of embedded device off-line digital according to claim 2 copyright management (Digital Right Management) certificate control-management system, it is characterized in that: described certificate file comprises certificate reference time, certificate reference time is early than the duration of certificate time, when embedded device is enabled data content for the first time, be slower than certificate reference time administrative time as digital version power, then processing unit is adjusted the digital copyright management time and is met certificate reference time.
4. a kind of embedded device off-line digital according to claim 3 copyright management (Digital Right Management) certificate control-management system, it is characterized in that: the storage area of described certificate core abstract is for fixing, when the storage area was full by the core data storage, processing unit replaced more preceding very early time core data service time with the most recent core data.
5. a kind of embedded device off-line digital according to claim 4 copyright management (Digital Right Management) certificate control-management system, it is characterized in that: described core data saves as the search tree structure with strip columnwise in certificate core abstract, and processing unit is retrieved in search tree according to certificate number.
6. embedded device off-line digital copyright management certificate control and management method, it is characterized in that: the method includes the steps of:
1) preparation process for embedded device is provided, has digital copyright management time system, certificate core abstract and processing unit in the embedded device;
2) obtain certificate file and data content step, for embedded device obtains certificate file and corresponding data content by the certificate issued center, wherein, certificate file comprises certificate number, duration of certificate time and duration of certificate number of times;
3) obtain the certificate number step, enable data content for the first time when embedded device, processing unit promptly obtains certificate number;
4) the record certificate number is used the course step, be to stab last service time with the processing unit record when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number;
5) store the core data step, stabbing processing unit combination certificate number, last service time and last access times are core data, and it is stored in certificate core abstract with strip columnwise;
6) search the certificate number step, when embedded device was enabled data content once more, processing unit was target with the certificate number, searched certificate core abstract and whether contained certificate number;
7) contrast certificate file and core data step, when certificate core abstract contains certificate number, then processing unit comparison certificate file and the core data that comprises certificate number;
8) when certificate file be time limit during the keyholed back plate pattern, stab and meet duration of certificate during the time when last service time, then certificate file is stopped using, data content is also stopped using;
9) when certificate file was number of times keyholed back plate pattern, when last access times met the duration of certificate number of times, then certificate file was stopped using, and data content is also stopped using.
7. a kind of embedded device off-line digital copyright management certificate control and management method according to claim 6, it is characterized in that: described method comprises verification step 10), this step comprises:
10.1) embedded device submits to the proof data to give certificate keyholed back plate center;
10.2) the anti-additional proof data of this certificate keyholed back plate center proof in certificate file, give embedded device with the certificate file granting when embedded device obtains certificate file;
10.3) authentication unit comparison is stored in the whether certificate of compliance data of verification msg of the protection zone in the embedded device;
10.4) if meet, then certificate file is enabled and embedded device obtains certificate number;
10.5) if do not meet, then online validation is carried out at the online certificate keyholed back plate of embedded device center again.
8. a kind of embedded device off-line digital copyright management certificate control and management method according to claim 7, it is characterized in that: described method comprises digital copyright management time set-up procedure 11), this step comprises:
11.1) whether the processing unit comparison be slower than the certificate reference time in the certificate file digital copyright management time;
11.2) if the digital copyright management time is slower than certificate reference time, then processing unit is adjusted the digital copyright management time and met certificate reference time.
9. a kind of embedded device off-line digital copyright management certificate control and management method according to claim 8 is characterized in that: described certificate reference time is early than the duration of certificate time.
10. a kind of embedded device off-line digital copyright management certificate control and management method according to claim 9, it is characterized in that: described method comprises off-line registration step 12), this step comprises:
12.1) whether the comparison certificate number be present in the content of certificate core abstract;
12.2) if do not exist, then processing unit obtains certificate number, and record is to stab last service time when the digital copyright management time that time certificate number is used, and record is last access times when the access times of time certificate number.
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| CN2011101520118A CN102289610A (en) | 2011-06-08 | 2011-06-08 | Offline certificate control and management system and method of digital rights management (DRM) of embedded device |
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| CN2011101520118A CN102289610A (en) | 2011-06-08 | 2011-06-08 | Offline certificate control and management system and method of digital rights management (DRM) of embedded device |
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Application publication date: 20111221 |