CN100470568C - Method and system for keeping digital copyright management time synchronization - Google Patents
Method and system for keeping digital copyright management time synchronization Download PDFInfo
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- CN100470568C CN100470568C CNB2006100604276A CN200610060427A CN100470568C CN 100470568 C CN100470568 C CN 100470568C CN B2006100604276 A CNB2006100604276 A CN B2006100604276A CN 200610060427 A CN200610060427 A CN 200610060427A CN 100470568 C CN100470568 C CN 100470568C
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 99
- 230000004044 response Effects 0.000 claims description 13
- 230000002123 temporal effect Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000007726 management method Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 9
- 101100171184 Arabidopsis thaliana DRMH1 gene Proteins 0.000 abstract 1
- 101150053091 DRM2 gene Proteins 0.000 abstract 1
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
- H04L2463/101—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying security measures for digital rights management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
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Abstract
The invention relates to a method for holding time synchronization of digit version management, and a relative system, wherein a terminal device is arranged with a safe time unit for recording a device standard time or/and time slippage, the terminal device with the safe time unit processes time synchronization with a time synchronous reference device at start, based on the time synchronized result, correcting the safe time information in the safe time unit. The invention can effectively resolve the time synchronization problem of OMA DRM2. 0 and the accumulated error problem of maintenance safe time slippage when the device avoids initializing ROAP protocol, and the hard construction of safe time reference when the terminal safe time is destroyed (as power off, and data loss). The invention can realize safe clock via software without additional hardware on terminal device, with low cost.
Description
Technical field
The present invention relates to Open Mobile Alliance digital copyright management technology, more particularly, relate to and a kind ofly in Open Mobile Alliance system for numeral copyright management (Open Mobile Alliance Digital RightsManagement System is hereinafter to be referred as OMA DRM system), provide synchronous method and system of a kind of retention time for digital copyright management.
Background technology
Recently, rapid such as the copyright protection technology development of OMA DRM system, and extensively approved gradually.Copyright protection technology is mainly used in the protection to the digital content that comprises music, video, image, books, computer software etc., mainly by authorities such as the use of digital content, copy are limited, realizes the protection to digital content.
In OMA DRM2.0 technology, the use of the digital content of right objects is controlled by the controlled variable of in right objects (Rights Object), setting.For example, limit the access times of controlling digital content by the number of times in the right objects (count); Restriction by the valid period in the right objects (datetime) realizes the term of life of digital content is limited; Come use cumulative time length to digital content to limit etc. by accumulative total duration (accumulated).And right objects is a pith of copyright control in the OMA DRM technology.In the technical manual of above-mentioned OMA DRM2.0, validity period of certificate for terminal device, in the right objects with contents such as relevant limiting parameter of time, need remove to safeguard a safety time by terminal, if safety time is lost, between terminal and server, carry out the ROAP (abbreviation of Rights ObjectAcquisition Protocol, rights object acquisition protocol) during protocol interaction, by the OCSP (abbreviation of Online Certificate Status Protocol, online certificate status protocol) agreement is carried out the time synchronized operation, makes that terminal and OCSP Responsder are synchronous in time.Fig. 1 has provided the 4-pass register flow path figure of ROAP agreement.As shown in Figure 1, terminal device sends greeting (step 101) to authorization center, after authorization center is received greeting, respond (step 102) to the terminal device greeting, when terminal device is initiated register requirement (step 103) to authorization center, whether the device security time that authorization center (Rights lssuer) meeting inspection terminal device is brought up is correct, if it is incorrect, then initiate OCSP request (step 104) to OCSP respondent (responder) by authorization center, by OCSP respondent (responder) authorization center (step 105) is issued in OCSP response (OCSP Response), issued the registration response by authorization center again and give terminal device (step 106).Wherein, carried the standard time in the OCSP response, equipment carries out the time synchronized operation according to the standard time in the OCSP response.
The 2-pass copyright of ROAP agreement is obtained flow process as shown in Figure 2.Terminal device in the RO that sends to the authorization center request (RO Request) (step 201) on belt transect the safety time of equipment.Whether authorization center can correctly judge (step 202) to this safety time equally, if it is incorrect to judge this safety time, send OCSP request (step 203) to OCSP respondent, receive that then issuing OCSP after the OCSP response (step 204) responds to terminal device (step 205).Equipment carries out according to the standard time in the OCSP response synchronously.
There is a common issue with in the time synchronized scheme that relates among 2-PASS and the 4-PASS among the above-mentioned OMA DRM2.0, is exactly that time synchronized only just can be carried out when Rights Issuer initiates the ROAP agreement at terminal device.This has just stayed a hidden danger.Such as, the user can no longer initiate the ROAP agreement after obtaining some right objects, by allowing device looses power or other possible measures make the device security time that variation take place.At this moment, when using digital content, the user can reach the purpose of reusing right objects the hack time, will have problems in the rights of using control of right objects to digital content.
The name that proposes at KimTae-sung is called the U.S. Pat 20050177513 of " digital rights management method and the system that are used for content copyright protection " (" Digital rights management method and system for content copyrightprotection "), has mentioned the time modification information or the time offset to terminal device of coming recording user by a time security module (time secure module).When the user uses digital content, can calculate a standard time according to the current time of terminal device and the time offset of time security module record, thereby the copyright control information that guarantees digital content is carried out effectively, and is not subjected to the influence of user's hack time.For example, the current standard time is 13:00, and user's current time also is 13:00, and the user is 11:00 with time modification this moment, has shifted to an earlier date two hours, and then the time security module will be noted this time change amount (2 hours).When the equipment time showing is 15:00, just can determine that the Current Standard time should be 17:00 according to the time modification information or the time offset of time security module record.
There is following shortcoming in above-mentioned prior art: 1) need determine a standard time and the measures of dispersion of equipment between the time when initial.Later on when user's modification during the time, the time modification information that the time security module writes down will add up, thereby may cause the accumulation of error, the accuracy of influence time.2) in case the time modification information dropout that this safety time module is safeguarded does not then have effective means to recover again.3) some mobile terminal device is in unexpected power down, and after restarting, the time can become an initial time automatically.For example, become 2000-01-01 from 2005-9-28.At this moment, the change of time system time after power down changes, and the time security module can not write down this time variation amount, and the standard time that will cause the safety time module to calculate is no longer accurate.
Summary of the invention
The technical problem to be solved in the present invention is; for managing and protect the right objects information of DRM content more effectively; a kind of solution of digital copyright management maintenance safe time that is is proposed; can overcome the shortcoming of prior art; not only aspect time synchronized, do not rely on terminal device and initiate the ROAP agreement to authorization center; and timing tracking accuracy is preferably arranged on the basis that does not rely on the safety time module, specifically just provide a kind of method and system with maintenance digital copyright management time synchronized of These characteristics.
The above-mentioned technical matters of the present invention solves like this, constructs a kind of method of digital copyright management time synchronized that keeps and may further comprise the steps: the safety time unit that A1) is provided for writing down this device security temporal information for terminal device; A2) when starting shooting, initiate NTP (Network Time Protocol) to time synchronous base equipment by the terminal device that comprises the safety time unit, receive the message that contains the standard time that sends in the safe transmission mode after the described time synchronized reference device response protocol message, and therefrom obtain the standard time; And A3) temporal information in described standard time and the local security time quantum is compared, if both have surpassed permissible range at error, think that then the local security time is disabled, need to upgrade, carry out adjust the local security clock or update time offset information.
In said method of the present invention, described time synchronized reference device is the time synchronized base station with respect to mobile terminal device, or with respect to the time synchronized server of network-termination device.
In said method of the present invention, further comprising the steps of: A4) whether whether described terminal device supervision time side-play amount file or data exist or detect secure clock and be initialised; A5) if determine the time offset file or data do not exist or secure clock is not initialised, then initiate the time synchronized request to the time synchronized reference device; A6) terminal device according to from upgrade the up-to-date lock in time of time synchronized reference device reference time and again initialization time side-play amount or adjust the secure hardware clock.
According to a kind of system that keeps the digital copyright management time synchronized provided by the invention, comprise: the terminal device that contains the safety time unit of record security temporal information, the time synchronized reference device that is connected with terminal device, when starting shooting, terminal device initiates NTP (Network Time Protocol) to described time synchronized reference device, receive the message that contains the standard time that sends in the safe transmission mode after the described time synchronized reference device response protocol message, and therefrom obtain the standard time, temporal information in described standard time and the local security time quantum is compared, if both have surpassed permissible range at error, think that then the local security time is disabled, need to upgrade, carry out to adjust the local security clock or update time offset information, make the safety time information and the described time synchronized reference device of safety time unit record keep synchronously, wherein, the temporal information in the safety time unit of terminal device is passed through the standard time or/and time offset, perhaps hardware clock is represented.
In said system of the present invention, described time synchronized reference device is the time synchronized base station with respect to mobile terminal device, or with respect to the time synchronized server of network-termination device.
Implement the method and system that the present invention keeps the digital copyright management time synchronized, (this equipment is the base station to portable terminal in when start and time synchronized reference device by setting up a terminal device, to the network terminal is the time synchronized server) carry out time synchronized, revise the safety time information of terminal simultaneously, can significantly reduce the situation that the terminal security time loses or distorted.For example, can solve the time synchronization problem when equipment is not initiated the ROAP agreement among the OMA DRM2.0 effectively; Solved the cumulative errors problem in the maintenance safe time offset; After having solved the safety time destroyed (for example power down, loss of data etc.) of terminal, be difficult to rebulid the problem of safety time benchmark.For the control action that more effectively realizes copyright information in the digital copyright protection technology has proposed a good scheme.Simultaneously, method and system of the present invention can not increase any hardware in terminal, realize secure clock by software, so cost is lower.
Description of drawings
Fig. 1 is a rights object acquisition protocol ROAP 4-pass register flow path synoptic diagram in the prior art;
Fig. 2 is that rights object acquisition protocol ROAP 2-pass copyright is obtained schematic flow sheet in the prior art;
Fig. 3 is the synoptic diagram of explanation the inventive method first embodiment, is used to illustrate between equipment with hardware clock and the base station carry out time synchronization process;
Fig. 4 is the synoptic diagram of the inventive method second embodiment, is used to illustrate the time synchronization process that carries out between the equipment of no hardware clock and the base station;
Fig. 5 is the synoptic diagram of the inventive method the 3rd embodiment, is used to illustrate the equipment of hardware clock and the time synchronization process between the time synchronized server;
Fig. 6 is the synoptic diagram of the inventive method the 4th embodiment, is used to illustrate the equipment of no hardware clock and the time synchronization process between the time synchronized server;
Fig. 7 is the synoptic diagram of the inventive method the 5th embodiment, is used to illustrate how terminal device carries out the maintenance work of local security time in the deadline synchronously;
Fig. 8 is the synoptic diagram of the inventive method the 7th embodiment, the equipment that is used to illustrate hardware clock time safe in utilization how when using copyright;
Fig. 9 is the synoptic diagram of the inventive method the 8th embodiment, the equipment that is used to illustrate no hardware clock time safe in utilization how when using copyright.
Embodiment
Core of the present invention is included in and the safety time unit is set on the equipment and starts synchronizing process with the time synchronized reference cell when device power, wherein there are two classes the safety time unit in the equipment, one time-like uses hardware clock, another kind of is the software temporal information, comprises the standard time or/and time offset.
Wherein, the time synchronized reference cell has two kinds, is respectively with respect to the time synchronized base station of mobile terminal device and with respect to the time synchronized server of network-termination device.
In maintenance digital copyright management method for synchronizing time kind provided by the invention, be meant synchronously at digital publishing rights and use the time synchronized of carrying out between the time synchronized reference device of the safety time unit of terminal and authorization center, its prerequisite is at first will set up the safety time unit on terminal.Set up the safety time unit several different methods is arranged, for example, can adopt the method for the safety time module that proposes among the aforementioned patent US 20050177513, also can be by increasing the method for hardware clock, by the method that maintenance customer's modification time information realizes or other are possible.Above-mentioned time reference equipment can be the base station that cooperates the mobile terminal device time synchronized, also can be the time synchronized server that cooperates network-termination device.
Set up on the safety time unit basis at equipment, time synchronized for service equipment and time synchronized reference device, need prescribed terminal equipment to start shooting at every turn, promptly want synchronization program start-up time, in other words, the synchronizing process between terminal device and the time synchronized reference device is powered on by terminal device or starting-up signal activates, calls.See on the other hand, use the power-up initializing process of the terminal device of the inventive method just to comprise or embedded one and carry out the process of time synchronized with the time synchronized reference device.
A standard time that is provided by the time synchronized reference device or the time offset of reflection standard time have been provided synchronous result.Equipment comes the equipment of maintenance time to say for modification service time information after receiving the time offset of standard time or reflection standard time, just updates time modification information according to the standard time during each time synchronized; For hardware clock, adjust the time of this hardware clock during then each time synchronized.
Method of the present invention comprise at least possess the safety time unit, starting up of terminal is to adjust such three links in safety time unit synchronously and according to the time synchronized result start-up time.Promptly want earlier terminal device to safeguard a safety time by safe unit.When equipment was started shooting at every turn, terminal was carried out the time synchronized operation.Safety time upgrades by following mode and safeguards: 1) carry out lock in time with the base station behind the mobile terminal-opening.Terminal according to upgrade up-to-date lock in time reference time and again initialization time side-play amount or adjust the secure hardware clock.2) carry out synchronously between network terminal start back and the time synchronized server.Terminal according to upgrade up-to-date lock in time reference time and again initialization time side-play amount or adjust the secure hardware clock.In this time synchronizing method, the time synchronized message between terminal and the time synchronized server need be received safeguard protection, prevents that malice from distorting.Safety precautions can adopt SSL or measures such as digital digest, signature to realize.3) terminal discovery safety time is lost, and for example the time modification amount is lost, and then initiates the time synchronized operation to the time synchronized server.Terminal according to upgrade up-to-date lock in time reference time and again initialization time side-play amount or adjust the secure hardware clock.
Embodiments of the invention are contained time synchronization process and copyright two aspects of use to safety time.Wherein: time synchronized includes the equipment of hardware clock and two kinds of equipment of equipment of no hardware clock; And the unclocked mobile device or the network equipment arranged corresponding to any, carry out the treatment scheme of time synchronized respectively with mobile base station and two kinds of safety time reference device of time synchronized server.
Below in conjunction with process flow diagram, each embodiment of the present invention is described further.
First embodiment shown in Fig. 3, be intended to illustrate the mobile terminal device 31 of hardware clock and as the time synchronization process between the base station 32 of safety time reference device, wherein, terminal device 31 is provided with hardware clock 34, this hardware clock 34 can not be revised the equipment user, simultaneously, also, terminal device 31 is used to write down this equipment standard time or/and the safety time unit 303 (not being drawn in) of time offset with equipment for being provided with, carry out time synchronized by the terminal device 301 that comprises the safety time unit in when start and time synchronized reference device, its process is as follows:
Mobile terminal device 31 starts, start immediately after the start and the time synchronization process of time synchronized base station 32 (arrow 1. shown in), in time synchronization process, set up and being connected of time synchronized base station by agreement, the standard time that the time for reading synchronising base station provides, on this basis, mobile terminal device 31 is the Current Standard time according to the time synchronized result, startup is to the correction of the safety time information in the safety time unit 33, promptly safety time unit 33 safety time information revised (arrow 2. shown in).In fact this correction revises the standard time that the hardware clock of expression safety time information provides for the base station in the secure clock unit in the mobile terminal device.
In second embodiment of the inventive method shown in Fig. 4, do not have and start immediately after mobile terminal device 41 start of hardware clock and the time synchronization process of base station 42 (arrow 1. shown in), after the standard time of acquisition and base station, according to this standard time, mobile terminal device 41 starts correction to safety time unit 43 clock informations (arrow 2. shown in).In fact this correction revises time offset in the mobile terminal device safety time unit.
In the 3rd embodiment of the inventive method shown in Fig. 5, network-termination device 51 starts of band hardware clock, start immediately after the start and the time synchronization process of time synchronized server 52 (arrow 1. shown in), after time synchronization process was obtained the standard time from time synchronized server 52, network-termination device 51 started correction to hardware clock information in its safety time unit 53 (arrow 2. shown in).In fact this correction revises the standard time that current time of the hardware clock in the network-termination device secure clock unit provides for the base station.
In the 4th embodiment of the inventive method shown in Fig. 6, do not start shooting with the network-termination device 61 of hardware clock, start immediately after the start and the time synchronization process of time synchronized server 62 (arrow 1. shown in), after time synchronization process was obtained the standard time from time synchronized server 62, network-termination device 61 started correction to its safety time unit 63 clock informations (arrow 2. shown in).This correction is actually according to the time offset of revising network-termination device secure clock unit from the standard time of time synchronized server.
Fig. 7-Fig. 9 illustrate terminal device the deadline synchronously after, terminal device is the time safe in utilization how.
In the 5th embodiment of the enforcement the inventive method shown in Fig. 7, terminal device 71 is found the safety time information dropout safeguarded, initiates time synchronized requests (arrow 1. shown in) to time synchronized server 72.Methods such as whether terminal can exist by supervision time side-play amount file or data, whether secure clock is initialised determine whether safety time is lost.After finishing with the synchronizing process of time synchronized server, terminal is revised (arrow 2. shown in) to its secure clock unit, after promptly finishing synchronously, revises the time offset of equipment time security modules as frame 73.
The inventive method the 6th embodiment, how acquisition time is synchronous to be used to illustrate terminal device, provides the synchronous concrete steps of acquisition time below:
1) device power-up or think in the time of need carrying out time synchronized is initiated NTP time synchronization protocol or self-defining time synchronization protocol to the time synchronization server;
2) time synchronized server response protocol message, send in the safe transmission mode contain correct time message to the equipment of initiating time synchronized;
3) equipment is received corresponding time response of message and therefrom get access to correct time.Self-defining time synchronized message need be carried out safe transmission, for example adopts the SSL transmission, is distorted to prevent to transmit in the way.
4) after equipment obtains correct time, compare with temporal information in the local security time quantum of its maintenance; If both errors have surpassed the scope of allowing, (according to OMA DRM2.0 standard, this allowable error is 120ppm, and promptly about 1 year allowable error is 60 minutes.The implication of the ppm of unit is: the error of parts per million (ppm) can be arranged in 1 second), think that then the local security time is disabled, need to upgrade.Because Network Transmission and server process have certain delay, in time synchronization process, the temporal information that the time synchronized server sends generally all can comprise a Network Transmission and processing delay.This time delay can be according to network condition, through repeatedly test back statistics is definite, be a normal value this time delay " predesignating in a period of time ", for example: the delay of this time period of 14:00～17:00 is 5ms in the afternoon, in the time delay of this time period of 19:00～21:00 is 10ms, this value is handed down to equipment or safeguards this value by device storage when the lock in time by server then, equipment need re-use according to being adjusted into the relatively accurate time this time delay the time after time of receipt (T of R) information.Method of adjustment is: the standard time=standard time-time delay of receiving.
5) confirm that at equipment the current safety time need be updated, adjust the local security clock or update time offset information.After time synchronized and local security time obtained correct renewal, terminal device just can be correctly, effectively use according to copyright information when using digital content.
Be the use flow process of explanation the inventive method, below in conjunction with Fig. 8 and discussion the inventive method the 7th embodiment.After frame 801 beginnings, before using digital content, the time of at first obtaining secure clock is as frame 802; At frame 803, be illustrated in the process of using digital content, calculate, safeguard the control information of the time correlation in the copyright according to safety time.For example, judge whether the copyright term of validity is expired, copyright uses whether duration has used up etc.Simultaneously the user is upgraded in copyright, safeguards information service time of content.In the process of using content,, then stop using content if find that copyright lost efficacy.Perhaps the user initiatively stops using content.Use end or copyright to lose efficacy up to digital content, end at frame 804.
Be the another kind use flow process of explanation the inventive method, below in conjunction with Fig. 9 and discussion the inventive method the 8th embodiment.After frame 901 beginnings, before using digital content, at first determine the time offset such as the frame 902 of safety time module; In ensuing frame 903, calculate the Current Standard time according to time offset; At follow-up frame 904, be illustrated in the process of using digital content, calculate, safeguard the control information of the time correlation in the copyright according to safety time.After calculating the standard time, copyright for time correlation, whether for example term of validity copyright effectively, then judges according to the current standard time whether this term of validity is expired or not yet due during 2005-01-01 12:00 to the 2005-01-02 13:00, available with decision.This patent mainly provides the safe standard time to DRM equipment, specifically how to use this standard time to carry out copyright and safeguards the scope of no longer discussing.For example, judge whether the copyright term of validity is expired, copyright uses whether duration has used up etc.Simultaneously the user is upgraded in copyright, safeguards information service time of content; In addition, in the process of using content,, then stop using content if find that copyright lost efficacy.Perhaps the user initiatively stops using content, as frame 905.
Claims (5)
1, a kind of method that keeps the digital copyright management time synchronized is characterized in that, may further comprise the steps:
A1) be provided for writing down the safety time unit of this device security temporal information for terminal device;
A2) when starting shooting, initiate NTP (Network Time Protocol) to time synchronous base equipment by the terminal device that comprises the safety time unit, receive the message that contains the standard time that sends in the safe transmission mode after the described time synchronized reference device response protocol message, and therefrom obtain the standard time; And,
A3) temporal information in described standard time and the local security time quantum is compared, if both have surpassed permissible range at error, think that then the local security time is disabled, need to upgrade, carry out adjust the local security clock or update time offset information.
According to the described method of claim 1, it is characterized in that 2, described time synchronized reference device is the time synchronized base station with respect to mobile terminal device, or with respect to the time synchronized server of network-termination device.
According to the described method of claim 1, it is characterized in that 3, further comprising the steps of: A4) whether described terminal device supervision time side-play amount file or data exist or detect secure clock and whether be initialised; A5) if determine the time offset file or data do not exist or secure clock is not initialised, then initiate the time synchronized request to the time synchronized reference device; A6) terminal device according to from upgrade the up-to-date lock in time of time synchronized reference device the standard time and again initialization time side-play amount or adjust the secure hardware clock.
4, a kind of system that keeps the digital copyright management time synchronized, it is characterized in that, comprise: the terminal device that contains the safety time unit of record security temporal information, the time synchronized reference device that is connected with terminal device, when starting shooting, terminal device initiates NTP (Network Time Protocol) to described time synchronized reference device, receive the message that contains the standard time that sends in the safe transmission mode after the described time synchronized reference device response protocol message, and therefrom obtain the standard time, temporal information in described standard time and the local security time quantum is compared, if both have surpassed permissible range at error, think that then the local security time is disabled, need to upgrade, carry out to adjust the local security clock or update time offset information, make the safety time information and the described time synchronized reference device of safety time unit record keep synchronously, wherein, the temporal information in the safety time unit of terminal device is passed through the standard time or/and time offset, perhaps hardware clock is represented.
According to the described system of claim 4, it is characterized in that 5, described time synchronized reference device is the time synchronized base station with respect to mobile terminal device, or with respect to the time synchronized server of network-termination device.
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| CNB2006100604276A CN100470568C (en) | 2006-04-18 | 2006-04-18 | Method and system for keeping digital copyright management time synchronization |
| PCT/CN2007/000076 WO2007118387A1 (en) | 2006-04-18 | 2007-01-09 | A method and system for keeping digital rights management time synchronization |
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| CNB2006100604276A CN100470568C (en) | 2006-04-18 | 2006-04-18 | Method and system for keeping digital copyright management time synchronization |
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| US7146504B2 (en) * | 2002-06-13 | 2006-12-05 | Microsoft Corporation | Secure clock on computing device such as may be required in connection with a trust-based system |
| JP2004078883A (en) * | 2002-06-17 | 2004-03-11 | Ntt Docomo Inc | Communication terminal, program and record medium |
| US20050005114A1 (en) * | 2003-07-05 | 2005-01-06 | General Instrument Corporation | Ticket-based secure time delivery in digital networks |
-
2006
- 2006-04-18 CN CNB2006100604276A patent/CN100470568C/en active Active
-
2007
- 2007-01-09 WO PCT/CN2007/000076 patent/WO2007118387A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322785A (en) * | 2017-12-29 | 2018-07-24 | 青岛海信电器股份有限公司 | Double time service digital rights certificate term of validity determination methods, device and television terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007118387A1 (en) | 2007-10-25 |
| CN101059825A (en) | 2007-10-24 |
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