CN105100889A - Descrambling key set updating method and set-top box - Google Patents
Descrambling key set updating method and set-top box Download PDFInfo
- Publication number
- CN105100889A CN105100889A CN201510490914.5A CN201510490914A CN105100889A CN 105100889 A CN105100889 A CN 105100889A CN 201510490914 A CN201510490914 A CN 201510490914A CN 105100889 A CN105100889 A CN 105100889A
- Authority
- CN
- China
- Prior art keywords
- descramble key
- target
- top box
- biss
- descriptor
- 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.)
- Granted
Links
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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
- H04N21/43853—Multiplex stream processing, e.g. multiplex stream decrypting involving multiplex stream decryption
-
- 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
Abstract
The embodiment of the invention discloses a descrambling key set updating method and a set-top box. The method comprises steps: the set-top box firstly acquires a target frequency point comprising a BISS descriptor; the target frequency point is then demodulated to acquire service information corresponding to the target frequency point; a target service group association table is then acquired from the service information; and a descrambling key corresponding to the BISS descriptor is then acquired from the target service group association table, the descrambling key is finally added to a pre-stored descrambling key set so as to update the descrambling key set. In the embodiment of the invention, a user does not need to manually input the descrambling key, the set-top box can automatically acquire the descrambling key corresponding to the BISS descriptor, the descrambling key is added to the pre-stored descrambling key set so as to update the descrambling key set, and thus the descrambling key set updating efficiency can be improved.
Description
Technical field
The present invention relates to digital television techniques field, particularly relate to a kind of descramble key set updating method and Set Top Box.
Background technology
Along with the fast development of digital television techniques and the universal rapidly of terminal, the function of terminal is day by day perfect.For Set Top Box, increasing media content providers utilizes Set Top Box transmitting multimedia contents, to ensure that user can select arbitrarily the content of multimedia oneself wanting to watch.But, in actual applications, the content of multimedia utilizing Set Top Box to transmit along with media content providers gets more and more, price is also in continuous reduction, therefore media content providers is in order to ensure operation cost, part starts to adopt basic co-operation scrambling system (BasicInteroperableScramblingSystem, BISS) scrambling is carried out to the content of multimedia provided, only have the validated user of operator can obtain corresponding descramble key, and use descramble key descrambling, corresponding content of multimedia can be checked.
When using descramble key to carry out descrambling to current scrambled multimedia content to be played, whether first Set Top Box detects in the descramble key set prestored exists the descramble key corresponding with current scrambled multimedia content to be played; If exist, then this descramble key can be used to carry out descrambling to current scrambled multimedia content to be played; If do not exist, then by the input port of display screen output for inputting descramble key of content of multimedia output device, manually can input descramble key to point out user; When receiving descramble key, Set Top Box can be decrypted according to this descramble key, and upgrades descramble key set.But not all user is familiar with signal scrambling technique, and due to the complexity of descramble key itself, user may need repeatedly to attempt can be successful, thus reduce the renewal efficiency of descramble key set.
Summary of the invention
Embodiments provide a kind of descramble key set updating method and Set Top Box, the renewal efficiency of descramble key set can be improved.
First aspect, the embodiment of the invention discloses a kind of descramble key set updating method, comprising:
Obtain the target frequency comprising basic co-operation scrambling system BISS descriptor;
Demodulation is carried out to described target frequency, to obtain the business information corresponding with described target frequency;
Target service group contingency table is obtained from described business information;
From described target service group contingency table, obtain the descramble key corresponding with described BISS descriptor, and described descramble key is added in the descramble key set prestored, to upgrade described descramble key set.
In conjunction with the implementation of first aspect, in the first possible implementation of first aspect, execution step can also perform following steps before obtaining and comprising the target frequency of basic co-operation scrambling system BISS descriptor:
Detect Set Top Box and whether open descramble key set generation patterns;
If when detecting that described Set Top Box opens described descramble key set generation patterns, perform the step that described acquisition comprises the target frequency of basic co-operation scrambling system BISS descriptor.
In conjunction with the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, can also following steps be performed:
When receiving channel switching instruction, detect in the described descramble key set after upgrading the target descramble key corresponding to target channel that whether there is described channel switching instruction and comprise;
If detect in the described descramble key set after upgrading and there is described target descramble key, then obtain described target descramble key, and use described target descramble key to carry out descrambling to described target channel.
In conjunction with the implementation that first aspect the second is possible, in the third possible implementation of first aspect, after execution step obtains target service group contingency table from described business information, step can also perform following steps obtain the descramble key corresponding with described BISS descriptor from described target service group contingency table before:
Detect described target service group contingency table whether to match with the BAT bouquet association table prestored;
If when detecting that described target service group contingency table does not mate with the described BAT bouquet association table prestored, perform the described step obtaining the descramble key corresponding with described BISS descriptor from described target service group contingency table.
In any one possible implementation in the implementation possible in conjunction with the second of the first possible implementation of the implementation of first aspect, first aspect, first aspect and the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, described target service group contingency table comprises at least one or multiple in the version number of described BISS descriptor, channel information and descramble key.
Second aspect, the embodiment of the invention also discloses a kind of Set Top Box, comprising:
First acquiring unit, for obtaining the target frequency comprising basic co-operation scrambling system BISS descriptor;
Demodulating unit, for carrying out demodulation to described target frequency, to obtain the business information corresponding with described target frequency;
Second acquisition unit, for obtaining target service group contingency table from described business information;
3rd acquiring unit, for obtaining the descramble key corresponding with described BISS descriptor from described target service group contingency table;
Adding device, for being added into by described descramble key in the descramble key set that prestores, to upgrade described descramble key set.
In conjunction with the Set Top Box of second aspect, in the first possible Set Top Box of second aspect, described Set Top Box also comprises:
First detecting unit, before comprising the target frequency of basic co-operation scrambling system BISS descriptor in the first acquiring unit acquisition, detects Set Top Box and whether opens descramble key set generation patterns;
If when described first acquiring unit detects that described Set Top Box opens described descramble key set generation patterns specifically for described first detecting unit, obtain the target frequency comprising basic co-operation scrambling system BISS descriptor.
In conjunction with the first possible Set Top Box of second aspect, in the Set Top Box that the second of second aspect is possible, described Set Top Box also comprises:
Second detecting unit, for when receiving channel switching instruction, detects in the described descramble key set after upgrading the target descramble key corresponding to target channel that whether there is described channel switching instruction and comprise;
, there is described target descramble key if detect in the described descramble key set after upgrading for described second detecting unit, then obtain described target descramble key in the 4th acquiring unit;
Descrambling unit, carries out descrambling for the target descramble key using described 4th acquiring unit to get to described target channel.
In conjunction with in the Set Top Box that second aspect the second is possible, in the third possible Set Top Box of second aspect, described Set Top Box also comprises:
Whether the 3rd detecting unit, match with the BAT bouquet association table prestored for detecting described target service group contingency table;
If when described 3rd acquiring unit detects that described target service group contingency table does not mate with the described BAT bouquet association table prestored for described 3rd detecting unit, from described target service group contingency table, obtain the descramble key corresponding with described BISS descriptor.
Any one Set Top Box in the Set Top Box possible in conjunction with the second of the first possible Set Top Box of the Set Top Box of second aspect, second aspect, second aspect and the third possible Set Top Box of second aspect, in the 4th kind of possible Set Top Box of second aspect, described target service group contingency table comprises at least one or multiple in the version number of described BISS descriptor, channel information and descramble key.
In the embodiment of the present invention, first Set Top Box obtains the target frequency comprising BISS descriptor; Again demodulation is carried out to target frequency, to obtain the business information corresponding with target frequency; Target service group contingency table is obtained again from business information; From target service group contingency table, obtain the descramble key corresponding with BISS descriptor again, finally descramble key is added in the descramble key set prestored, to upgrade descramble key set.In embodiments of the present invention, manually input descramble key without the need to user, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of a kind of descramble key set updating method disclosed in the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of another kind of descramble key set updating method disclosed in the embodiment of the present invention;
Fig. 3 is the structural representation of a kind of Set Top Box disclosed in the embodiment of the present invention;
Fig. 4 is the structural representation of another kind of Set Top Box disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of descramble key set updating method and Set Top Box, in embodiments of the present invention, manually descramble key is inputted without the need to user, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Refer to Fig. 1, Fig. 1 is the schematic flow sheet of a kind of descramble key set updating method disclosed in the embodiment of the present invention.As shown in Figure 1, this descramble key set updating method can comprise the following steps:
S101, obtain and comprise the target frequency of basic co-operation scrambling system BISS descriptor.
In the embodiment of the present invention, basic co-operation scrambling system (BasicInteroperableScramblingSystem, BISS), it is a kind of method for scrambling used in digital television system, by European Broadcasting Union (EuropeanBroadcastingUnion, EBU) the satellite broadcasting encryption system formulated. numerous hardware manufacturer all supports this agreement, and its CAID mark is 2600.Change every some cycles (being generally 5 ~ 30 seconds) relative to the key of CAS, special-purpose software (ECMG, EMMG) or equipment (as scrambling machine) is had by designated lane, the encryption method that BISS key is fixing, what it did not need the softwares such as CAS and function complexity adds anti-machine, and the transmission of key can be the very simple mode such as to pass from mouth to mouth.Be different from general satellite television because Satellite news is live, be not suitable for adopting general encryption method.If Satellite news signal is when transmitting without any encryption, this has an opportunity directly to be watched from its satellite-signal by intentionally personage, is therefore necessary the encryption standard formulating a kind of list.BISS encryption is protected by l2 position key (sessionkey), only has launch party and receives and know just now, and transmitter could be decoded depending on all needing the identical key tooth of input with reception, and its scrambling algorithms is based on DVB Common Scrambling Algorithm DVB-CSA.From aforementioned: as long as we can find 12 of BISS KEY just can watch TV programme.
In the embodiment of the present invention, frequency is to the numbering of fixed frequency.For example, if frequency interval is all 200KHz, so just according to the frequency interval of 200KHz from 890MHz, 890.2MHz, 890.4MHz, 890.6MHz, 890.8MHz, 891MHz ... 915MHz is divided into 125 wireless frequency sections, and each frequency range is numbered, from 1,2,3,4 ... 125; These are exactly our said frequency to the numbering of fixed frequency; On the contrary: frequency is the numbering to fixed frequency.We replace with frequency the tranmitting frequency that frequency carrys out appointed transceiving letter unit in gsm networks.For example: specify the frequency of a carrier wave to be 3, this carrier wave will accept the upward signal that frequency is 890.4MHz and with the frequency emissioning signal of 935.4MHz in other words.The frequency range of GSM900 can be divided into 125 frequencies (actual available 124).Wherein 1 ~ 94 belongs to China Mobile, 96 ~ 124 and belongs to CHINAUNICOM, and 95 retain to distinguish Liang Jia operator.
In the embodiment of the present invention, after Set Top Box starts, then can obtain the target frequency comprising basic co-operation scrambling system BISS descriptor.
S102, demodulation is carried out to target frequency, to obtain the business information corresponding with target frequency.
In the embodiment of the present invention, demodulation is the inverse process of modulation.Modulation system is different, and demodulation method is also different.Corresponding with the classification of modulation, demodulation can be divided into sinusoidal wave demodulation (sometimes also referred to as continuous wave demodulation) and impulse wave demodulation.Sinusoidal wave demodulation also can be further divided into amplitude demodulation, frequency demodulation and phase demodulating, also has some mutation in addition as single sideband singal demodulation, vestigial sideband (vsb) signal demodulation etc.Equally, impulse wave demodulation also can be divided into pulse amplitude demodulation, impulse phase demodulation, the demodulation of pulse duration solution mediation pulse code etc.Multiple Modulation is needed to be equipped with multiple demodulation.Demodulating process comprises two key links substantially: first carrying the frequency spectrum shift of useful information to base band being arranged in nearby carriers, then leaching baseband signal with corresponding filter, completing demodulation tasks.The demodulation of pulse-modulated signal is fairly simple.Such as pulse-ampli tude modulation and pulse-width signal all contain very large modulation signal component, directly they can be leached from pulse-modulated wave, realize demodulation with low pass filter; Modulation signal component in some pulse-modulated wave (as pulse-position modulation, pulse-code modulation etc.) is less, usually first they is become pulse amplitude or pulse-width signal, then with filter, useful signal is leached.Modulation signal component is not comprised in sinusoidal wave modulated signal.Should the conversion of advanced line frequency during demodulation, be contained within useful signal frequency spectrum shift in sideband to suitable frequency band pregnant, then with filter or suitable device, useful signal detected.
In the embodiment of the present invention, due in Digital Television, all videos, audio frequency, word, picture etc. all become data after digitized processing, and pack according to the standard of MPEG-2, form the transmission bag of regular length (188 bytes), then these packets are carried out multiplexing, form transport stream (TransportStream, TS).Usually the transport stream (TransportStream) be made up of multiple program and service integration, the channel of the corresponding 8MHz bandwidth of TS stream.In order to find the code stream of needs in digital TV set-top box, identify different business information, some guidance informations must be added in TS stream, for this reason, in MPEG-2, special definition (ProgramSpecificInformation, PSI) information, its effect carries the some TS stream of multiple program from one correctly to find specific program.The PSI table defined in Moving Picture Experts Group-2 is the description of flowing single TS.
In the embodiment of the present invention, flow because system exists multiple TS usually, the business oneself needed can be found out rapidly in TS stream to guide digital cable customers, the PSI of DVB to MPEG-2 expands, the basis of PSI tetra-table adds nine tables again, form business information (ServiceInformation, SI).SI is the description to all TS stream of whole system, the SI of DVB standard definition is inserted in the TS transport stream meeting MPEG-2 (13818-1), the Integrated Receive Decoder of Set Top Box (Set-Top-Box) (IRD) is made from TS stream, to extract the list of program offers broadcast items and broadcast parameter, be shown to digital cable customers with form intuitively, make user can receive easily, select digital television program.PSI table comprises Program Association Table (ProgramAssociationTable, PAT), CAT Conditional Access Table (ConditionalAccessTable, CAT), Program Map Table (ProgramMapTable, and network information table (NetworkInformationTable PMT), NIT) form, these tables are inserted in TS stream by multiplexer when multiplexing, and identify by specific Packet Identifier.SI comprises SDT Service Description Table (ServiceDescriptionTable, SDT), Event Information Table (EventInformationTable (, EIT), TDT Time and Date Table (timedatetable, TDT), the table such as BAT bouquet association table (Batbouquetassociationtable, BAT) information.
In the embodiment of the present invention, each table in SI in actual use and not all need transmit, wherein NIT, SDT, EIT, TDT must transmit, other table then carry out as required selections transmission.Have two kinds of identifiers in TS stream, one is Packet Identifier, and one is table identifier.The different information tables with identical PID are distinguished by table identifier TABLEID, find them at receiving terminal by looking into these specific PID.
Particularly, after having got the target frequency comprising basic co-operation scrambling system BISS descriptor, then Set Top Box can carry out demodulation to target frequency, to obtain the business information corresponding with target frequency.Wherein, business information is as above introduced.
S103, from business information, obtain target service group contingency table.
In the embodiment of the present invention, BAT bouquet association table provides the relevant information of bouquet, gives the information such as the service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet.
In the embodiment of the present invention, when carrying out demodulation to the target frequency got, after obtaining the business information corresponding with target frequency, then can obtain target service group contingency table from business information, to obtain the information such as service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet.
S104, the descramble key that acquisition is corresponding with BISS descriptor from target service group contingency table, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.
In the embodiment of the present invention, can prestore descramble key set in Set Top Box, wherein, this descramble key set can be that user stores as required, also can be that Set Top Box stores according to historical storage record.
In the embodiment of the present invention, the information such as the service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet are comprised due to target service group contingency table, then Set Top Box is after acquisition target service group contingency table, then can obtain the descramble key corresponding with BISS descriptor in target service group contingency table, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.
In FIG, first Set Top Box obtains the target frequency comprising BISS descriptor; Again demodulation is carried out to target frequency, to obtain the business information corresponding with target frequency; Target service group contingency table is obtained again from business information; From target service group contingency table, obtain the descramble key corresponding with BISS descriptor again, finally descramble key is added in the descramble key set prestored, to upgrade descramble key set.In embodiments of the present invention, manually input descramble key without the need to user, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Refer to Fig. 2, Fig. 2 is the schematic flow sheet of another kind of descramble key set updating method disclosed in the embodiment of the present invention.As shown in Figure 2, this descramble key set updating method can comprise the following steps:
Whether S201, detection Set Top Box open descramble key set generation patterns.
In the embodiment of the present invention, descramble key set generation patterns mainly comprises the pattern of the descramble key set that Set Top Box can store according to the descramble key real-time update local terminal comprised in BAT bouquet association table.
In the embodiment of the present invention, after Set Top Box starts, then can detect and whether open descramble key set generation patterns.
If when S202 detects that Set Top Box opens descramble key set generation patterns, obtain the target frequency comprising basic co-operation scrambling system BISS descriptor.
In the embodiment of the present invention, if when detecting that Set Top Box opens descramble key set generation patterns, the descramble key set that this Set Top Box can store according to the descramble key real-time update local terminal comprised in BAT bouquet association table is then described, therefore, Set Top Box can obtain the target frequency comprising basic co-operation scrambling system BISS descriptor, and continues to perform the step upgrading descramble key set.If when detecting that Set Top Box does not open descramble key set generation patterns, then can export for pointing out the information of whether opening descramble key set generation patterns.Wherein, this information can comprise in voice message, text prompt or flashing indicating one or more, and the output of this information needs to have come by external equipment.
S203, demodulation is carried out to target frequency, to obtain the business information corresponding with target frequency.
S204, from business information, obtain target service group contingency table.
S205, the descramble key that acquisition is corresponding with BISS descriptor from target service group contingency table, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.
In the embodiment of the present invention, after obtain target service group contingency table from business information, then can detect the target service group contingency table got and whether match with the BAT bouquet association table prestored; If when detecting that target service group contingency table does not mate with the BAT bouquet association table prestored, from target service group contingency table, obtain the descramble key corresponding with BISS descriptor.If when detecting that target service group contingency table mates with the BAT bouquet association table prestored, then illustrate that the descramble key set of the current storage of Set Top Box has been up-to-date descramble key set, then Set Top Box is without the need to doing where reason for the renewal of descramble key set.
In the embodiment of the present invention, BAT bouquet association table can comprise lower critical field: descramble key descriptor version number, channel information and descramble key; Wherein, descramble key descriptor version number is to Set Top Box for contrasting with canned data in Flash, and judges that current descramble key set is the need of the foundation upgraded; And channel information be for indicate follow-up descramble key should with which channel corresponding to; Be finally the descramble key real data of 8 bytes, after being stored into Set Top Box Flash, Set Top Box can be got these data and is directly set to descramble key and carry out descrambling to corresponding scrambled program.
In the embodiment of the present invention, after the set of renewal descramble key, can also following steps be performed:
11) when receiving channel switching instruction, the target descramble key corresponding to target channel that whether there is channel switching instruction and comprise is detected in the descramble key set after upgrading;
12) if there is target descramble key in detecting the descramble key set after upgrading, then obtain target descramble key, and use target descramble key to carry out descrambling to target channel.
In the embodiment of the present invention, can carry the identification information of target channel in switching command, this identification information is used for determining target channel.
In the embodiment of the present invention, when receiving channel switching instruction, detect in the descramble key set after upgrading the target descramble key corresponding to target channel that whether there is channel switching instruction and comprise; If detect in the descramble key set after upgrading and there is target descramble key, then obtain target descramble key, and use target descramble key to carry out descrambling to target channel.If detect in the descramble key set after upgrading and there is not target descramble key, then illustrate that target channel is scrambled channel, illustrates that this channel temporarily can not be watched, user can obtain the authority of this channel of viewing by channels such as payments.
In the embodiment of the present invention, content of multimedia (carrying out the content of multimedia after scrambling as adopted descrambling key) before being transmitted, the cipher mode pre-set also should be adopted to carry out degree of depth encryption to descramble key, encrypted back is only had to transmit, and during the descramble key of Set Top Box after receiving encryption, first need to adopt the manner of decryption pre-set to be decrypted descramble key, recycling descramble key descrambling.Wherein, the cipher mode pre-set should be decided through consultation in advance with manner of decryption and use identical key rule.For example, when cipher mode is Advanced Encryption Standard (AdvancedEncryptionStandard, AES) time, use key A as encrypting and decrypting rule, when the initial data before encryption is 0101010301010103, then after adopting AES encryption, then corresponding data are 71F2961D3E50A8BE, when Set Top Box receives enciphered data 71F2961D3E50A8BE, after using key A deciphering, finally obtain original decruption key 0101010301010103.Thus ensure that the fail safe of descramble key in transmitting procedure
In fig. 2, describe in detail when Set Top Box opens descramble key set generation patterns, Set Top Box can according to the descramble key set prestored in BAT bouquet association table real-time update local terminal.Due in embodiments of the present invention, manually input descramble key without the need to user equally, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Refer to Fig. 3, Fig. 3 is the structural representation of a kind of Set Top Box disclosed in the embodiment of the present invention, for performing above-mentioned descramble key set updating method.As shown in Figure 3, this Set Top Box can comprise: the first acquiring unit 301, demodulating unit 302, second acquisition unit 303, the 3rd acquiring unit 304 and adding device 305, wherein,
First acquiring unit 301, for obtaining the target frequency comprising basic co-operation scrambling system BISS descriptor.
In the embodiment of the present invention, basic co-operation scrambling system (BasicInteroperableScramblingSystem, BISS), it is a kind of method for scrambling used in digital television system, by European Broadcasting Union (EuropeanBroadcastingUnion, EBU) the satellite broadcasting encryption system formulated. numerous hardware manufacturer all supports this agreement, and its CAID mark is 2600.Change every some cycles (being generally 5 ~ 30 seconds) relative to the key of CAS, special-purpose software (ECMG, EMMG) or equipment (as scrambling machine) is had by designated lane, the encryption method that BISS key is fixing, what it did not need the softwares such as CAS and function complexity adds anti-machine, and the transmission of key can be the very simple mode such as to pass from mouth to mouth.Be different from general satellite television because Satellite news is live, be not suitable for adopting general encryption method.If Satellite news signal is when transmitting without any encryption, this has an opportunity directly to be watched from its satellite-signal by intentionally personage, is therefore necessary the encryption standard formulating a kind of list.BISS encryption is protected by l2 position key (sessionkey), only has launch party and receives and know just now, and transmitter could be decoded depending on all needing the identical key tooth of input with reception, and its scrambling algorithms is based on DVB Common Scrambling Algorithm DVB-CSA.From aforementioned: as long as we can find 12 of BISS KEY just can watch TV programme.
In the embodiment of the present invention, frequency is to the numbering of fixed frequency.For example, if frequency interval is all 200KHz, so just according to the frequency interval of 200KHz from 890MHz, 890.2MHz, 890.4MHz, 890.6MHz, 890.8MHz, 891MHz ... 915MHz is divided into 125 wireless frequency sections, and each frequency range is numbered, from 1,2,3,4 ... 125; These are exactly our said frequency to the numbering of fixed frequency; On the contrary: frequency is the numbering to fixed frequency.We replace with frequency the tranmitting frequency that frequency carrys out appointed transceiving letter unit in gsm networks.For example: specify the frequency of a carrier wave to be 3, this carrier wave will accept the upward signal that frequency is 890.4MHz and with the frequency emissioning signal of 935.4MHz in other words.The frequency range of GSM900 can be divided into 125 frequencies (actual available 124).Wherein 1 ~ 94 belongs to China Mobile, 96 ~ 124 and belongs to CHINAUNICOM, and 95 retain to distinguish Liang Jia operator.
In the embodiment of the present invention, after Set Top Box starts, then the first acquiring unit 301 can obtain the target frequency comprising basic co-operation scrambling system BISS descriptor.
Demodulating unit 302, for carrying out demodulation to target frequency, to obtain the business information corresponding with target frequency.
In the embodiment of the present invention, demodulation is the inverse process of modulation.Modulation system is different, and demodulation method is also different.Corresponding with the classification of modulation, demodulation can be divided into sinusoidal wave demodulation (sometimes also referred to as continuous wave demodulation) and impulse wave demodulation.Sinusoidal wave demodulation also can be further divided into amplitude demodulation, frequency demodulation and phase demodulating, also has some mutation in addition as single sideband singal demodulation, vestigial sideband (vsb) signal demodulation etc.Equally, impulse wave demodulation also can be divided into pulse amplitude demodulation, impulse phase demodulation, the demodulation of pulse duration solution mediation pulse code etc.Multiple Modulation is needed to be equipped with multiple demodulation.Demodulating process comprises two key links substantially: first carrying the frequency spectrum shift of useful information to base band being arranged in nearby carriers, then leaching baseband signal with corresponding filter, completing demodulation tasks.The demodulation of pulse-modulated signal is fairly simple.Such as pulse-ampli tude modulation and pulse-width signal all contain very large modulation signal component, directly they can be leached from pulse-modulated wave, realize demodulation with low pass filter; Modulation signal component in some pulse-modulated wave (as pulse-position modulation, pulse-code modulation etc.) is less, usually first they is become pulse amplitude or pulse-width signal, then with filter, useful signal is leached.Modulation signal component is not comprised in sinusoidal wave modulated signal.Should the conversion of advanced line frequency during demodulation, be contained within useful signal frequency spectrum shift in sideband to suitable frequency band pregnant, then with filter or suitable device, useful signal detected.
In the embodiment of the present invention, due in Digital Television, all videos, audio frequency, word, picture etc. all become data after digitized processing, and pack according to the standard of MPEG-2, form the transmission bag of regular length (188 bytes), then these packets are carried out multiplexing, form transport stream (TransportStream, TS).Usually the transport stream (TransportStream) be made up of multiple program and service integration, the channel of the corresponding 8MHz bandwidth of TS stream.In order to find the code stream of needs in digital TV set-top box, identify different business information, some guidance informations must be added in TS stream, for this reason, in MPEG-2, special definition (ProgramSpecificInformation, PSI) information, its effect carries the some TS stream of multiple program from one correctly to find specific program.The PSI table defined in Moving Picture Experts Group-2 is the description of flowing single TS.
In the embodiment of the present invention, flow because system exists multiple TS usually, the business oneself needed can be found out rapidly in TS stream to guide digital cable customers, the PSI of DVB to MPEG-2 expands, the basis of PSI tetra-table adds nine tables again, form business information (ServiceInformation, SI).SI is the description to all TS stream of whole system, the SI of DVB standard definition is inserted in the TS transport stream meeting MPEG-2 (13818-1), the Integrated Receive Decoder of Set Top Box (Set-Top-Box) (IRD) is made from TS stream, to extract the list of program offers broadcast items and broadcast parameter, be shown to digital cable customers with form intuitively, make user can receive easily, select digital television program.PSI table comprises Program Association Table (ProgramAssociationTable, PAT), CAT Conditional Access Table (ConditionalAccessTable, CAT), Program Map Table (ProgramMapTable, and network information table (NetworkInformationTable PMT), NIT) form, these tables are inserted in TS stream by multiplexer when multiplexing, and identify by specific Packet Identifier.SI comprises SDT Service Description Table (ServiceDescriptionTable, SDT), Event Information Table (EventInformationTable (, EIT), TDT Time and Date Table (timedatetable, TDT), the table such as BAT bouquet association table (Batbouquetassociationtable, BAT) information.
In the embodiment of the present invention, each table in SI in actual use and not all need transmit, wherein NIT, SDT, EIT, TDT must transmit, other table then carry out as required selections transmission.Have two kinds of identifiers in TS stream, one is Packet Identifier, and one is table identifier.The different information tables with identical PID are distinguished by table identifier TABLEID, find them at receiving terminal by looking into these specific PID.
Particularly, after the first acquiring unit 301 has got the target frequency comprising basic co-operation scrambling system BISS descriptor, then demodulating unit 302 can carry out demodulation to target frequency, to obtain the business information corresponding with target frequency.Wherein, business information is as above introduced.
Second acquisition unit 303, for obtaining target service group contingency table from business information.
In the embodiment of the present invention, BAT bouquet association table provides the relevant information of bouquet, gives the information such as the service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet.
In the embodiment of the present invention, when demodulating unit 302 carries out demodulation to the target frequency got, after obtaining the business information corresponding with target frequency, then second acquisition unit 303 can obtain target service group contingency table from business information, to obtain the information such as service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet.
3rd acquiring unit 304, for obtaining the descramble key corresponding with BISS descriptor from target service group contingency table.
Adding device 305, for being added into by descramble key in the descramble key set that prestores, to upgrade described descramble key set.
In the embodiment of the present invention, can prestore descramble key set in Set Top Box, wherein, this descramble key set can be that user stores as required, also can be that Set Top Box stores according to historical storage record.
In the embodiment of the present invention, the information such as the service lists in the title of bouquet, the descramble key corresponding with BISS descriptor and each bouquet are comprised due to target service group contingency table, then second acquisition unit 303 is after acquisition target service group contingency table, then the 3rd acquiring unit 304 can obtain the descramble key corresponding with BISS descriptor in target service group contingency table, descramble key is also added in the descramble key set prestored, to upgrade descramble key set by adding device 305.
In figure 3, first the first acquiring unit 301 obtains the target frequency comprising BISS descriptor; Demodulating unit 302 carries out demodulation to target frequency again, to obtain the business information corresponding with target frequency; Second acquisition unit 303 obtains target service group contingency table again from business information; 3rd acquiring unit 304 obtains the descramble key corresponding with BISS descriptor again from target service group contingency table, and descramble key is added in the descramble key set prestored by last adding device 305, to upgrade descramble key set.In embodiments of the present invention, manually input descramble key without the need to user, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Refer to Fig. 4, Fig. 4 is the structural representation of another kind of Set Top Box disclosed in the embodiment of the present invention, for performing above-mentioned descramble key set updating method.Wherein, Fig. 4 obtains at the enterprising step refining in the basis of Fig. 3, except comprising all unit shown in Fig. 3, can also comprise: the first detecting unit 306, the 3rd detecting unit 307, second detecting unit 308, the 4th acquiring unit 309 and Descrambling unit 310, wherein
First detecting unit 306, before comprising the target frequency of basic co-operation scrambling system BISS descriptor in the first acquiring unit 301 acquisition, detects Set Top Box and whether opens descramble key set generation patterns.
Wherein, if when the first acquiring unit 301 detects that Set Top Box opens descramble key set generation patterns specifically for the first detecting unit 306, the target frequency comprising basic co-operation scrambling system BISS descriptor is obtained.
In the embodiment of the present invention, descramble key set generation patterns mainly comprises the pattern of the descramble key set that Set Top Box can store according to the descramble key real-time update local terminal comprised in BAT bouquet association table.
In the embodiment of the present invention, after Set Top Box starts, then the first detecting unit 306 can detect and whether open descramble key set generation patterns.
In the embodiment of the present invention, if when the first detecting unit 306 detects that Set Top Box opens descramble key set generation patterns, the descramble key set that this Set Top Box can store according to the descramble key real-time update local terminal comprised in BAT bouquet association table is then described, therefore, Set Top Box can obtain the target frequency comprising basic co-operation scrambling system BISS descriptor, and continues to perform the step upgrading descramble key set.If when the first detecting unit 306 detects that Set Top Box does not open descramble key set generation patterns, then can export for pointing out the information of whether opening descramble key set generation patterns.Wherein, this information can comprise in voice message, text prompt or flashing indicating one or more, and the output of this information needs to have come by external equipment.
Whether the 3rd detecting unit 307, match with the BAT bouquet association table prestored for detecting target service group contingency table.
If when the 3rd acquiring unit 304 detects that target service group contingency table does not mate with the BAT bouquet association table prestored for the 3rd detecting unit 307, from target service group contingency table, obtain the descramble key corresponding with BISS descriptor.
In the embodiment of the present invention, after obtain target service group contingency table from business information, then whether the 3rd detecting unit 307 can detect the target service group contingency table got and the BAT bouquet association table prestored and match; If when the 3rd detecting unit 307 detects that target service group contingency table does not mate with the BAT bouquet association table prestored, from target service group contingency table, obtain the descramble key corresponding with BISS descriptor.If when the 3rd detecting unit 307 detects that target service group contingency table mates with the BAT bouquet association table prestored, then the descramble key set of the current storage of explanation Set Top Box has been up-to-date descramble key set, then Set Top Box is without the need to doing where reason for the renewal of descramble key set.
In the embodiment of the present invention, BAT bouquet association table can comprise lower critical field: descramble key descriptor version number, channel information and descramble key; Wherein, descramble key descriptor version number is to Set Top Box for contrasting with canned data in Flash, and judges that current descramble key set is the need of the foundation upgraded; And channel information be for indicate follow-up descramble key should with which channel corresponding to; Be finally the descramble key real data of 8 bytes, after being stored into Set Top Box Flash, Set Top Box can be got these data and is directly set to descramble key and carry out descrambling to corresponding scrambled program.
Second detecting unit 308, for when receiving channel switching instruction, detects in the described descramble key set after upgrading the target descramble key corresponding to target channel that whether there is channel switching instruction and comprise.
, there is target descramble key if detect in the descramble key set after upgrading for the second detecting unit 308, then obtain target descramble key in the 4th acquiring unit 309.
Descrambling unit 310, carries out descrambling for the target descramble key using the 4th acquiring unit 309 to get to target channel.
In the embodiment of the present invention, can carry the identification information of target channel in switching command, this identification information is used for determining target channel.
In the embodiment of the present invention, when receiving channel switching instruction, the second detecting unit 308 detects in the descramble key set after upgrading the target descramble key corresponding to target channel that whether there is channel switching instruction and comprise; If the second detecting unit 308 detects in the descramble key set after upgrading there is target descramble key, then the 4th acquiring unit 309 obtains target descramble key, and Descrambling unit 310 also uses target descramble key to carry out descrambling to target channel.If the second detecting unit 308 detects in the descramble key set after upgrading there is not target descramble key, then illustrate that target channel is scrambled channel, illustrate that this channel temporarily can not be watched, user can obtain the authority of this channel of viewing by channels such as payments.
In the diagram, describe in detail when Set Top Box opens descramble key set generation patterns, can according to the descramble key set prestored in BAT bouquet association table real-time update local terminal.Due in embodiments of the present invention, manually input descramble key without the need to user equally, the descramble key that Set Top Box meeting automatic acquisition is corresponding with BISS descriptor, and descramble key is added in the descramble key set prestored, to upgrade descramble key set.As can be seen here, the renewal efficiency that the embodiment of the present invention can improve descramble key set is implemented.
Concrete, the part or all of flow process in the descramble key set updating method embodiment that the Set Top Box introduced in the embodiment of the present invention can implement composition graphs 1 of the present invention, Fig. 2 introduces.
Module in all embodiments of the present invention or submodule, universal integrated circuit can be passed through, such as CPU (CentralProcessingUnit, central processing unit), or realized by ASIC (ApplicationSpecificIntegratedCircuit, application-specific integrated circuit (ASIC)).
Step in embodiment of the present invention method can be carried out order according to actual needs and be adjusted, merges and delete.
Unit in embodiment of the present invention Set Top Box can carry out merging, divide and deleting according to actual needs.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random access memory (RandomAccessMemory is called for short RAM) etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. a descramble key set updating method, is characterized in that, comprising:
Obtain the target frequency comprising basic co-operation scrambling system BISS descriptor;
Demodulation is carried out to described target frequency, to obtain the business information corresponding with described target frequency;
Target service group contingency table is obtained from described business information;
From described target service group contingency table, obtain the descramble key corresponding with described BISS descriptor, and described descramble key is added in the descramble key set prestored, to upgrade described descramble key set.
2. method according to claim 1, is characterized in that, before described acquisition comprises the target frequency of basic co-operation scrambling system BISS descriptor, described method also comprises:
Detect Set Top Box and whether open descramble key set generation patterns;
If when detecting that described Set Top Box opens described descramble key set generation patterns, perform the step that described acquisition comprises the target frequency of basic co-operation scrambling system BISS descriptor.
3. method according to claim 2, is characterized in that, described method also comprises:
When receiving channel switching instruction, detect in the described descramble key set after upgrading the target descramble key corresponding to target channel that whether there is described channel switching instruction and comprise;
If detect in the described descramble key set after upgrading and there is described target descramble key, then obtain described target descramble key, and use described target descramble key to carry out descrambling to described target channel.
4. method according to claim 3, it is characterized in that, described from described business information, obtain target service group contingency table after, described from described target service group contingency table, obtain the descramble key corresponding with described BISS descriptor before, described method also comprises:
Detect described target service group contingency table whether to match with the BAT bouquet association table prestored;
If when detecting that described target service group contingency table does not mate with the described BAT bouquet association table prestored, perform the described step obtaining the descramble key corresponding with described BISS descriptor from described target service group contingency table.
5. according to the method in Claims 1 to 4 described in any one, it is characterized in that, described target service group contingency table comprises at least one or multiple in the version number of described BISS descriptor, channel information and descramble key.
6. a Set Top Box, is characterized in that, comprising:
First acquiring unit, for obtaining the target frequency comprising basic co-operation scrambling system BISS descriptor;
Demodulating unit, for carrying out demodulation to described target frequency, to obtain the business information corresponding with described target frequency;
Second acquisition unit, for obtaining target service group contingency table from described business information;
3rd acquiring unit, for obtaining the descramble key corresponding with described BISS descriptor from described target service group contingency table;
Adding device, for being added into by described descramble key in the descramble key set that prestores, to upgrade described descramble key set.
7. Set Top Box according to claim 6, is characterized in that, described Set Top Box also comprises:
First detecting unit, before comprising the target frequency of basic co-operation scrambling system BISS descriptor in the first acquiring unit acquisition, detects Set Top Box and whether opens descramble key set generation patterns;
If when described first acquiring unit detects that described Set Top Box opens described descramble key set generation patterns specifically for described first detecting unit, obtain the target frequency comprising basic co-operation scrambling system BISS descriptor.
8. Set Top Box according to claim 7, is characterized in that, described Set Top Box also comprises:
Second detecting unit, for when receiving channel switching instruction, detects in the described descramble key set after upgrading the target descramble key corresponding to target channel that whether there is described channel switching instruction and comprise;
, there is described target descramble key if detect in the described descramble key set after upgrading for described second detecting unit, then obtain described target descramble key in the 4th acquiring unit;
Descrambling unit, carries out descrambling for the target descramble key using described 4th acquiring unit to get to described target channel.
9. Set Top Box according to claim 8, is characterized in that, described Set Top Box also comprises:
Whether the 3rd detecting unit, match with the BAT bouquet association table prestored for detecting described target service group contingency table;
If when described 3rd acquiring unit detects that described target service group contingency table does not mate with the described BAT bouquet association table prestored for described 3rd detecting unit, from described target service group contingency table, obtain the descramble key corresponding with described BISS descriptor.
10. according to the Set Top Box in claim 6 ~ 9 described in any one, it is characterized in that, described target service group contingency table comprises at least one or multiple in the version number of described BISS descriptor, channel information and descramble key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510490914.5A CN105100889B (en) | 2015-08-12 | 2015-08-12 | A kind of descramble key set updating method and set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510490914.5A CN105100889B (en) | 2015-08-12 | 2015-08-12 | A kind of descramble key set updating method and set-top box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105100889A true CN105100889A (en) | 2015-11-25 |
| CN105100889B CN105100889B (en) | 2018-09-04 |
Family
ID=54580278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510490914.5A Active CN105100889B (en) | 2015-08-12 | 2015-08-12 | A kind of descramble key set updating method and set-top box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105100889B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040803A (en) * | 2017-03-31 | 2017-08-11 | 青岛海信电器股份有限公司 | Digital television system and the de-scrambling method for supporting multichannel different frequent points program simultaneously |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020080971A1 (en) * | 2000-12-15 | 2002-06-27 | Yukiyasu Fukami | Broardcast apparatus and reception apparatus for providing a storage service by which scrambled content is stored and descrambled using scrambling key list |
| CN1643922A (en) * | 2002-03-20 | 2005-07-20 | 松下电器产业株式会社 | Content playback apparatus, method, and program, and key management apparatus and system |
| CN101616127A (en) * | 2008-06-24 | 2009-12-30 | 深圳市同洲电子股份有限公司 | A kind of data de-scrambling method, device and receiving terminal |
| CN102665105A (en) * | 2012-05-15 | 2012-09-12 | 山东泰信电子有限公司 | Method for realizing rapid channel change of digital television terminal |
| CN103686214A (en) * | 2013-12-30 | 2014-03-26 | 深圳Tcl新技术有限公司 | Methods for encrypting television programs and playing encrypted television programs, front end and terminal |
| CN103929680A (en) * | 2014-03-28 | 2014-07-16 | 深圳市九洲电器有限公司 | Set top box encryption program descrambling method and set top box |
-
2015
- 2015-08-12 CN CN201510490914.5A patent/CN105100889B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020080971A1 (en) * | 2000-12-15 | 2002-06-27 | Yukiyasu Fukami | Broardcast apparatus and reception apparatus for providing a storage service by which scrambled content is stored and descrambled using scrambling key list |
| CN1643922A (en) * | 2002-03-20 | 2005-07-20 | 松下电器产业株式会社 | Content playback apparatus, method, and program, and key management apparatus and system |
| CN101616127A (en) * | 2008-06-24 | 2009-12-30 | 深圳市同洲电子股份有限公司 | A kind of data de-scrambling method, device and receiving terminal |
| CN102665105A (en) * | 2012-05-15 | 2012-09-12 | 山东泰信电子有限公司 | Method for realizing rapid channel change of digital television terminal |
| CN103686214A (en) * | 2013-12-30 | 2014-03-26 | 深圳Tcl新技术有限公司 | Methods for encrypting television programs and playing encrypted television programs, front end and terminal |
| CN103929680A (en) * | 2014-03-28 | 2014-07-16 | 深圳市九洲电器有限公司 | Set top box encryption program descrambling method and set top box |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040803A (en) * | 2017-03-31 | 2017-08-11 | 青岛海信电器股份有限公司 | Digital television system and the de-scrambling method for supporting multichannel different frequent points program simultaneously |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105100889B (en) | 2018-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4354080B2 (en) | Conditional access system | |
| JP2010193449A (en) | Method of securely providing control word from smart card to conditional access module | |
| CN104902311B (en) | A kind of shared method of audio and video resources, shared gateway and system | |
| CN101355640A (en) | Multi-display digital television set-top box | |
| EP2832104A1 (en) | Conditional access method and apparatus for simultaneously handling multiple television programmes | |
| CN101394297B (en) | DRM service implementing method, equipment and system under broadcast environment | |
| CN101360226A (en) | Transmission control method of digital television transmission stream and apparatus thereof | |
| KR20070046113A (en) | Transmitting apparatus and receiving apparatus | |
| CN201298872Y (en) | Multi-display digital TV set-top box | |
| CN105100889A (en) | Descrambling key set updating method and set-top box | |
| JP5113954B1 (en) | Digital broadcast receiving apparatus and program thereof | |
| JP2000295202A (en) | Limited reception system | |
| CN101568011B (en) | Method and device for rapidly searching unencrypted service of digital television | |
| EP2079238A1 (en) | Conditional access system | |
| CN107040803B (en) | Digital television system and descrambling method for simultaneously supporting multiple channels of programs with different frequency points | |
| JP2001189921A (en) | Limited reception system | |
| CN1964477A (en) | Multimedia signal receiving apparatus and control method thereof | |
| JP5901438B2 (en) | DIGITAL BROADCAST RECEIVING DEVICE, ITS PROGRAM, AND DIGITAL BROADCAST TRANSMITTING DEVICE | |
| JP4846826B2 (en) | Conditional access system | |
| JP2008294707A (en) | Digital broadcast receiving apparatus | |
| JP2007060167A (en) | Device and method for converting content, and content conversion program | |
| EP2597883A1 (en) | Method, cryptographic system and security module for descrambling content packets of a digital transport stream | |
| JP2004208107A (en) | Scrambled broadcast system, broadcast transmission device, and reception device | |
| CN1722659B (en) | Method and system for processing multiplex data and method and system for decoding multiplex data flow | |
| JP2004228624A (en) | Broadcast receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |