CN101945243B - Computing method of safety clock and terminal - Google Patents
Computing method of safety clock and terminal Download PDFInfo
- Publication number
- CN101945243B CN101945243B CN201010257646.XA CN201010257646A CN101945243B CN 101945243 B CN101945243 B CN 101945243B CN 201010257646 A CN201010257646 A CN 201010257646A CN 101945243 B CN101945243 B CN 101945243B
- Authority
- CN
- China
- Prior art keywords
- drm
- time
- terminal
- television
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004364 calculation method Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims description 29
- 230000004044 response Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
Landscapes
- Engineering & Computer Science (AREA)
- Databases & Information Systems (AREA)
- Computer Security & Cryptography (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electric Clocks (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a computing method of a safety clock, comprising the following steps: when watching the TV programs protected by digital rights management (DRM), a terminal computes the safety clock according to the difference between two latest obtained TV clocks, the difference between the two-time latest recorded boot time and the obtained DRM time. The invention also provides the terminal. The safety clock of the terminal is simply and rapidly updated according to the technical scheme of the invention.
Description
Technical Field
The invention relates to the field of mobile phone television services of terminals, in particular to a method for calculating a safety clock and a terminal.
Background
The Digital Video Broadcasting-Handheld (DVB-H) standard is a transmission standard specified by the Digital Video Broadcasting (DVB) organization for providing multimedia services to terminals through a terrestrial Digital Broadcasting network, and mobile televisions of this system were formally adopted by the European Telecommunications Standards Institute (ETSI) in 11 months in 2004 and are widely used in countries in europe, asia, and africa. When using the mobile phone television service, an operator of the mobile phone television service needs to ensure that a user of the mobile phone television service of the DVB-H system who pays normally can see the disturbed flow programs except the disturbed flow programs, and also needs to ensure that a user who pays abnormally can only see the disturbed flow programs, and the user needs to go to a communication operator website to purchase when watching the disturbed flow programs; therefore, it is necessary to protect the content of the mobile phone television to prevent the user who does not pay the normal fee from watching the scrambled stream program for no charge. In the prior art, the content of the mobile phone television is mainly protected by two ways: a conditional access system and a digital rights management system; the Conditional Access system may be a navaj (navajca) and an edid (irdeoppondication Access) system, and the Digital Rights Management system may be a V2.0 version of an Open Mobile Alliance Digital Rights Management (DRM) system.
When the content of the mobile TV is protected by using the method of the OMA DRM system, a clock is needed in the DVB-H terminal to judge whether a copyright object (RO) of the mobile TV acquired by a user is in a valid period, and the clock is a safe clock; the safety clock needs to be continuously synchronized with the network, and the user is not allowed to modify the time of the clock or the crystal oscillator number of the clock at will; the secure clock synchronizes with the network through a device registration process of a Rights Object Acquisition Protocol (ROAP), and after a user acquires an RO, if the device registration process of the ROAP is not performed any more, a situation that the mobile phone television content protected by the DRM can be unlimitedly used occurs. In the prior art, there is a method for implementing a secure clock by offsetting the current device time of a mobile terminal using a mobile tv and the device time during a registration process, which is feasible if a user does not change the system time of the mobile terminal; however, when the user modifies the system time or the system time is abnormal, the condition that the RO is abused still occurs; for example, the mobile television content purchased by the user is due at 8/1/2010, the current time is 8/2/2010, and the user adjusts the system time of the mobile terminal to any day before the 8/1/2010, so that the mobile terminal can still play the scrambled stream. In addition, there is another method for synchronizing with a Network clock source through a Network clock Protocol (NTP), which requires the mobile terminal to constantly maintain communication with the Network, thereby greatly increasing power consumption and usability of the mobile terminal.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for calculating a secure clock and a terminal, which are capable of updating the secure clock of the terminal simply and quickly.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a computing method of a secure clock, which comprises the following steps:
when watching a television program protected by Digital Rights Management (DRM), the terminal calculates a security clock according to the difference between two latest acquired television clocks, the difference between two latest recorded boot times and the acquired DRM time.
In the above method, the step of calculating, by the terminal, the secure clock according to the difference between the two latest acquired television clocks, the difference between the two latest recorded boot times, and the acquired DRM time further includes:
and after the terminal is started, the terminal records the starting time and acquires the television clock, and stores the recorded starting time and the acquired television clock.
In the above method, the recording of the boot time and the acquisition of the television clock by the terminal specifically includes:
a DRM module of the terminal acquires the time after the physical layer is synchronized with a DVB-H standard mobile phone television signal transmitting station through an interface of a chip of the physical layer for receiving television signals, wherein the time is a television clock; and after the terminal is started, the DRM module immediately records the current time of the terminal, and the time is the starting time.
In the above method, after the terminal is turned on, the step of recording the turn-on time and acquiring the tv clock by the terminal further includes:
and the terminal registers to the DRM server, acquires and stores the current DRM time.
In the above method, the registering of the terminal with the DRM server to obtain the current DRM time and store the current DRM time specifically includes:
a registration module of the terminal sends a greeting message to a DRM server, and the DRM server sends a DRM version and a trusted certificate authority encrypted by an encryption algorithm to the registration module through a reply message of the greeting message; the registration module sends the encrypted security clock and the encrypted certificate chain to the DRM server through a request message; the DRM server sends a registration response message carrying the current DRM time to a registration module; the registration module saves the current DRM time to the storage module of the terminal.
In the method, the terminal calculates the secure clock according to the difference between two latest acquired television clocks, the difference between two latest recorded boot times and the acquired DRM time specifically as follows:
and a computing module of the terminal computes the difference between the two latest acquired television clocks and the difference between the two latest acquired boot time stored in the storage module, and adds the difference between the two television clocks, the difference between the two boot time and the acquired DRM time to obtain the secure clock.
In the above method, the method further comprises:
calculating an absolute value of a difference between a Rights Object (RO) expiration time and a secure clock, comparing the absolute value with a validity period, and if the absolute value is less than the validity period, agreeing to view a television program protected by DRM; and if the absolute value is greater than the validity period, prompting to renew the mobile phone television service protected by the DRM.
The present invention also provides a terminal, including: the device comprises a storage module and a calculation module; wherein,
the storage module is used for storing the acquired television clock, the recorded starting time and the acquired DRM time;
and the computing module is used for computing the safety clock according to the difference of two latest acquired television clocks, the difference of two latest recorded boot time and the acquired DRM time when the television program protected by the DRM is watched.
In the above terminal, the terminal further includes: a registration module and a DRM module; wherein,
the register module is used for registering to the DRM server, acquiring the current DRM time and storing the current DRM time to the storage module;
and the DRM module is used for recording the starting time and acquiring the television clock after the terminal is started, and storing the recorded starting time and the acquired television clock in the storage module.
In the above terminal, the terminal further includes:
the valid period management module is used for calculating the absolute value of the difference between the RO expiration time and the safety clock, comparing the absolute value with the valid period, and if the absolute value is less than the valid period, agreeing to watch the television program protected by the DRM; and if the absolute value is greater than the validity period, prompting to renew the mobile phone television service protected by the DRM.
According to the calculation method and the terminal of the safe clock, the safe clock is calculated according to the difference of two latest acquired television clocks, the difference of two latest recorded boot time and the acquired DRM time, the interaction between the terminal and a network when the safe time is synchronized is effectively reduced, and the terminal only needs to be deployed, so that the time synchronization of the safe clock in the terminal and a DRM server is simply and quickly realized; in addition, as long as the television program protected by the DRM is watched, the calculation of the security clock is needed, and whether the validity period expires is judged by using the calculated security clock, so that the condition that the television program protected by the DRM is watched without limit because the user does not perform the equipment registration process of the ROAP any more is avoided.
Drawings
FIG. 1 is a flow chart of a computing method for implementing a secure clock according to the present invention;
fig. 2 is a schematic structural diagram of the terminal of the present invention.
Detailed Description
The basic idea of the invention is: when watching a television program protected by Digital Rights Management (DRM), the terminal calculates a security clock according to the difference between two latest acquired television clocks, the difference between two latest recorded boot times and the acquired DRM time.
The invention is further described in detail below with reference to the drawings and the specific embodiments.
The terminal in this embodiment is a terminal of a mobile television supporting the DVB-H standard, for example, a mobile terminal, an MP4 handheld television, a GPS handheld television, or the like capable of receiving a mobile television signal of the DVB-H standard.
The invention provides a method for calculating a secure clock, and fig. 1 is a schematic flow chart of the method for calculating the secure clock, and as shown in fig. 1, the method comprises the following steps:
step 101, a terminal registers to a DRM server, acquires and stores the current DRM time;
specifically, when the terminal communicates with the DRM server, that is, a copyright holder of the mobile television service for the first time or when the RO expires, a registration process needs to be initiated to the DRM server, where the process specifically is as follows: a registration module of a terminal sends a greeting message to a DRM server, wherein the greeting message carries information of the terminal, the information comprises an International Mobile Subscriber Identity (IMSI) of an SIM card in the terminal and versions of DRM which can be supported by the terminal, and the existing versions of DRM comprise versions 1.0, 2.0 and 2.1; after receiving the greeting message, the DRM server selects the version number of the DRM version corresponding to the DRM version number according to the DRM version supported by the terminal, and sends the version number of the DRM version encrypted by using an encryption algorithm and a trusted certificate authority to a registration module of the terminal where the SIM card corresponding to the IMSI in the greeting message is located through a reply message of the greeting message; after receiving the reply message, the registration module firstly judges whether the version number of the version of the DRM which can be supported by the terminal is consistent with the received version number, if so, the registration module utilizes a pre-stored device private key to carry out encryption operation on a current security clock and a certificate chain corresponding to a trusted certificate authority, and sends the encrypted security clock and the encrypted certificate chain to the DRM server through a request message; if not, the registration fails, and the current flow is ended; when the terminal is started every time, the DRM module records the current starting time, calculates the difference value of the two starting times which is closest to the time of registering the terminal to the DRM server, and the registering module acquires the difference value from the DRM module; when the terminal is started each time, the physical layer of the terminal can carry out time synchronization with the transmitting station; the registration module adds the acquired difference value to the time after the last physical layer synchronization to obtain a current safe clock; the certificate chain approved by the DRM server comprises a device certificate, a device private key, an operator certificate and a root certificate of a certificate authority, wherein the device certificate, the device private key, the operator certificate and the root certificate are purchased by the terminal from a trusted certificate authority;
after receiving the request message sent by the registration module, the DRM server judges whether the certificate chain carried by the DRM server is consistent with the certificate chain stored by the DRM server and the time of the security clock is consistent with the time of the DRM server, if one item is inconsistent or both items are inconsistent, the DRM server sends a request to a trusted certificate authority, and after receiving the request, the trusted certificate authority sends the certificate chain of the DRM server and the current DRM time to the DRM server; the DRM server sends a registration response message carrying the current DRM time and the certificate chain to a registration module; the registration module stores the current DRM time to a storage module of the terminal and replaces the original certificate chain with the received certificate chain; the storage module can be a memory of the terminal, a FLASH memory or a file system; if the two items are consistent, the registration response message returned by the DRM server does not carry any information, and after the registration module receives the empty registration response message, the time of the terminal is confirmed to be consistent with the current DRM time; after that, the calculation of the secure clock of the terminal needs to be implemented using the DRM time as a base time.
Step 102, after the terminal is started, the terminal records the starting time and acquires a television clock, and stores the recorded starting time and the acquired television clock;
specifically, a DVB-H mobile television signal transmitting station distributes information of an Electronic Service Guide (ESG) through a broadcast channel, and the information is updated every day; after the terminal is started each time, a physical layer of the terminal immediately initiates a downloading flow of ESG information, a DVB-H mobile TV signal transmitting station transmits the ESG information to the physical layer of the terminal through a broadcast channel, and the information comprises channel information, a program list and the like of a mobile TV; when the ESG information is sent, the physical layer of the terminal can carry out time synchronization with a transmitting station, and a DRM module of the terminal obtains the time after the physical layer is synchronized through an interface of a chip of the physical layer for receiving television signals, wherein the time is a television clock; after the terminal is started, a DRM module of the terminal immediately records the current time of the terminal, wherein the time is the starting time; and the DRM module of the terminal stores the acquired television clock and the recorded startup time into a television clock table and a startup time table of a storage module of the terminal, and the sequence of the storage is determined according to the acquired sequence.
103, when watching the television program protected by the DRM, the terminal calculates a safety clock according to the difference of two latest acquired television clocks, the difference of two latest recorded boot time and the acquired DRM time;
specifically, each time a television program protected by DRM is watched, a registration module of the terminal firstly judges whether to register with the DRM server according to whether a secure clock is stored in a storage module, and if the secure clock is stored in the terminal and the registration is carried out, the secure clock is triggered to calculate the secure clock by the calculation module; if no registration is made, the terminal has no information of the secure clock and directly executes step 101.
And the calculation module of the terminal calculates the difference between the two latest acquired television clocks and the difference between the two latest acquired startup times stored in the storage module according to the sequence of the television clocks and the startup clocks stored in the television clock table and the startup time table in the storage module, adds the difference between the two latest acquired television clocks, the difference between the two startup times and the acquired DRM time to obtain a safety clock, and sends the safety clock to the validity period management module of the terminal.
Step 104, calculating the absolute value of the difference between the RO expiration time and the safety clock, comparing the absolute value with the validity period, executing step 105 if the absolute value is less than the validity period, and executing step 106 if the absolute value is greater than the validity period;
specifically, the validity period management module of the terminal calculates an absolute value of a difference between the RO expiration time and the secure clock, compares the absolute value with the validity period, and if the absolute value is less than the validity period, it indicates that the RO is valid, executes step 105; if the absolute value is greater than the validity period, indicating that the RO is expired, go to step 106; wherein the RO expiration time and the validity period are acquired from the DRM server and stored in the storage module after the registration module completes the registration process with the DRM server.
Step 105, agreeing to watch the television program protected by DRM;
specifically, the validity period management module of the terminal agrees that the user normally watches the television program protected by the DRM.
Step 106, prompting to renew the mobile phone television service protected by DRM, and executing step 101;
specifically, the validity period management module prompts the user to renew the mobile phone television service protected by DRM, and step 101 is executed.
In order to implement the above method, the present invention further provides a terminal, fig. 2 is a schematic structural diagram of the terminal of the present invention, and as shown in fig. 2, the terminal includes: a storage module 21 and a calculation module 22; wherein,
the storage module 21 is used for storing the acquired television clock, the recorded starting time and the acquired DRM time; the storage module 21 may be a memory of the terminal, a FLASH memory or a file system;
and the calculating module 22 is configured to calculate the secure clock according to the difference between the two latest acquired television clocks, the difference between the two latest recorded boot times, and the acquired DRM time when the television program protected by DRM is watched.
The terminal further includes: a registration module 23, a DRM module 24; wherein,
a registration module 23, configured to register with the DRM server, obtain a current DRM time, and store the current DRM time in the storage module 21;
the DRM module 24 is configured to record the boot time and obtain the television clock after the terminal is started, and store the recorded boot time and the obtained television clock in the storage module 21.
The terminal further includes:
a valid period management module 25, configured to calculate an absolute value of a difference between the RO expiration time and the secure clock, compare the absolute value with the valid period, and if the absolute value is smaller than the valid period, agree to watch a television program protected by DRM; and if the absolute value is greater than the validity period, prompting to renew the mobile phone television service protected by the DRM.
The DRM module 24 records the boot time and obtains the tv clock specifically as follows: a DRM module 24 of the terminal acquires the time after the physical layer is synchronized with a DVB-H standard mobile phone television signal transmitting station through an interface of a chip of the physical layer for receiving television signals, wherein the time is a television clock; after the terminal is turned on, the DRM module 24 immediately records the current terminal time, which is the turn-on time.
The registering module 23 registers with the DRM server, obtains the current DRM time, and stores the current DRM time in the storage module 21 specifically as follows:
the registration module 23 of the terminal sends a greeting message to the DRM server, and the DRM server sends the version number of the DRM version and the trusted certificate authority encrypted by the encryption algorithm to the registration module 23 through a reply message of the greeting message; the registration module 23 sends the encrypted secure clock and certificate chain to the DRM server through a request message; the DRM server sends a registration response message carrying the current DRM time to the registration module 23; the registration module 23 saves the current DRM time to the storage module 21.
The calculating module 22 calculates the security clock according to the difference between the two latest acquired television clocks, the difference between the two latest recorded boot times, and the acquired DRM time, specifically:
the calculation module 22 of the terminal calculates the difference between the two newly acquired television clocks and the difference between the two newly acquired boot times stored in the storage module 21, adds the difference between the two television clocks, the difference between the two boot times, and the acquired DRM time to obtain a secure clock, and sends the secure clock to the validity period management module 25.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (6)
1. A method of computing a secure clock, the method comprising:
the terminal registers to a Digital Rights Management (DRM) server, acquires and stores the current DRM time;
after the terminal is started, the terminal records the starting time and acquires a television clock, and stores the recorded starting time and the acquired television clock;
when watching the television program protected by DRM, the terminal adds the difference of two latest acquired television clocks, the difference of two latest recorded starting times and the acquired DRM time to calculate a safe clock;
the television clock is the time after the DRM module of the terminal acquires the synchronization between the physical layer and the DVB-H mobile television signal transmitting station through the interface of the chip of the physical layer for receiving the television signal; the starting time is the time of the current terminal immediately recorded by the DRM module after the terminal is started; and the DRM time is the time of the current DRM server obtained by registering the terminal to the DRM server.
2. The method according to claim 1, wherein the registering of the terminal with the DRM server, obtaining and storing the current DRM time specifically comprises:
a registration module of the terminal sends a greeting message to a DRM server, and the DRM server sends a DRM version and a trusted certificate authority encrypted by an encryption algorithm to the registration module through a reply message of the greeting message; the registration module sends the encrypted security clock and the encrypted certificate chain to the DRM server through a request message; the DRM server sends a registration response message carrying the current DRM time to a registration module; the registration module saves the current DRM time to the storage module of the terminal.
3. The method according to claim 1, wherein the terminal recording the boot-up time and obtaining the television clock specifically comprises:
a DRM module of the terminal acquires the time after the physical layer is synchronized with a DVB-H standard mobile phone television signal transmitting station through an interface of a chip of the physical layer for receiving television signals, wherein the time is a television clock; and after the terminal is started, the DRM module immediately records the current time of the terminal, and the time is the starting time.
4. A method according to any one of claims 1 to 3, characterized in that the method further comprises:
calculating an absolute value of a difference between a Rights Object (RO) expiration time and a secure clock, comparing the absolute value with a validity period, and if the absolute value is less than the validity period, agreeing to view a television program protected by DRM; and if the absolute value is greater than the validity period, prompting to renew the mobile phone television service protected by the DRM.
5. A terminal, characterized in that the terminal comprises: the device comprises a registration module, a DRM module, a storage module and a calculation module; wherein,
the register module is used for registering to the DRM server, acquiring the current DRM time and storing the current DRM time to the storage module;
the DRM module is used for recording the starting time and acquiring the television clock after the terminal is started, and storing the recorded starting time and the acquired television clock to the storage module;
the storage module is used for storing the acquired television clock, the recorded starting time and the acquired DRM time;
the computing module is used for adding the difference of two latest acquired television clocks, the difference of two latest recorded boot time and the acquired DRM time when watching the television program protected by the DRM, and computing a safe clock;
the television clock is the time after the DRM module of the terminal acquires the synchronization between the physical layer and the DVB-H mobile television signal transmitting station through the interface of the chip of the physical layer for receiving the television signal; the starting time is the time of the current terminal immediately recorded by the DRM module after the terminal is started; and the DRM time is the time of the current DRM server obtained by registering the terminal to the DRM server.
6. The terminal of claim 5, further comprising:
the valid period management module is used for calculating the absolute value of the difference between the RO expiration time and the safety clock, comparing the absolute value with the valid period, and if the absolute value is less than the valid period, agreeing to watch the television program protected by the DRM; and if the absolute value is greater than the validity period, prompting to renew the mobile phone television service protected by the DRM.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010257646.XA CN101945243B (en) | 2010-08-16 | 2010-08-16 | Computing method of safety clock and terminal |
PCT/CN2011/076314 WO2012022197A1 (en) | 2010-08-16 | 2011-06-24 | Calculation method for secure clock and terminal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010257646.XA CN101945243B (en) | 2010-08-16 | 2010-08-16 | Computing method of safety clock and terminal |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101945243A CN101945243A (en) | 2011-01-12 |
CN101945243B true CN101945243B (en) | 2014-07-16 |
Family
ID=43436979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201010257646.XA Active CN101945243B (en) | 2010-08-16 | 2010-08-16 | Computing method of safety clock and terminal |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN101945243B (en) |
WO (1) | WO2012022197A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101945243B (en) * | 2010-08-16 | 2014-07-16 | 中兴通讯股份有限公司 | Computing method of safety clock and terminal |
CN102916812B (en) * | 2012-10-19 | 2015-11-25 | 雷欧尼斯(北京)信息技术有限公司 | The live authentication management system of movie theatre and method |
CN107547160B (en) * | 2017-06-28 | 2019-06-04 | 新华三技术有限公司 | A kind of method for synchronizing time and device |
CN108322785B (en) * | 2017-12-29 | 2021-04-16 | 海信视像科技股份有限公司 | Method and device for judging validity period of double-time service digital copyright certificate and television terminal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100470568C (en) * | 2006-04-18 | 2009-03-18 | 华为技术有限公司 | Method and system for keeping digital copyright management time synchronization |
US20080168565A1 (en) * | 2007-01-09 | 2008-07-10 | Nokia Corporation | Method, system, mobile device, apparatus and computer program product for validating rights objects |
KR101448122B1 (en) * | 2007-11-07 | 2014-10-07 | 삼성전자 주식회사 | Management device for rights management of time based digital rights management and method thereof |
CN101945243B (en) * | 2010-08-16 | 2014-07-16 | 中兴通讯股份有限公司 | Computing method of safety clock and terminal |
-
2010
- 2010-08-16 CN CN201010257646.XA patent/CN101945243B/en active Active
-
2011
- 2011-06-24 WO PCT/CN2011/076314 patent/WO2012022197A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
CN101945243A (en) | 2011-01-12 |
WO2012022197A1 (en) | 2012-02-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100641218B1 (en) | Conditional access broadcasting system for terrestrial digital multimedia broadcasting and method thereof | |
US20180373847A1 (en) | Broadcast DRM License Support for Receive Only Devices | |
KR101364462B1 (en) | Method and device for authorising conditional access | |
CN101945243B (en) | Computing method of safety clock and terminal | |
KR101062182B1 (en) | Method and device for automatic update of authority object | |
US8909246B2 (en) | Broadcast tuning concepts | |
CN101945101A (en) | The term of validity of control decruption key | |
US10397203B2 (en) | Reception device and reception method | |
EP2093689A2 (en) | System and method for withdrawing rights object of the digital contents | |
JP2004363724A (en) | Reception management apparatus, broadcast receiver, information distributor, and information distribution method and program | |
US20100106648A1 (en) | Method and apparatus for acquiring encryption key to provide pay channel | |
CN109068149B (en) | Program recommendation method, terminal and computer readable storage medium | |
CN108322785B (en) | Method and device for judging validity period of double-time service digital copyright certificate and television terminal | |
JP5400564B2 (en) | Receiving apparatus and content re-encryption method | |
CN102123390B (en) | Method, device and terminal for processing service keys | |
JP2004236136A (en) | Mobile communication terminal, communication system, and method for supplying decoding key | |
EP3308481B1 (en) | Receiver apparatus and method for controlling the access to contents broadcasted via satellite | |
US12015831B2 (en) | Multimedia content secure access | |
WO2009075535A2 (en) | Prepaid broadcasting receiver and subscriber management system and method thereof in digital multimedia broadcasting service | |
KR20100046428A (en) | Method and apparatus for acquiring encryption key for providing premium channel | |
KR20110107008A (en) | Apparatus and method for supporting smartcard profile in mobile broadcating system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant |