CN109474840B - Multicast channel scrambling method and system for coexistence of internal and external encryption modes - Google Patents
Multicast channel scrambling method and system for coexistence of internal and external encryption modes Download PDFInfo
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- CN109474840B CN109474840B CN201710801189.8A CN201710801189A CN109474840B CN 109474840 B CN109474840 B CN 109474840B CN 201710801189 A CN201710801189 A CN 201710801189A CN 109474840 B CN109474840 B CN 109474840B
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26613—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing keys in general
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- 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
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
Abstract
A scrambling method for multicast channels with coexisting internal and external encryption modes comprises the following steps: the channel production control center platform generates a corresponding multicast channel forwarding task request carrying encryption parameters according to the security level grade of the channel and sends the multicast channel forwarding task request to a multicast forwarding server; the multicast forwarding server encrypts the video data of the multicast channel internally or externally according to the encryption parameters and sets a head identifier when encrypting the video data of the multicast channel; and the client player receives the encrypted multicast channel video data, and decrypts and plays the encrypted multicast channel video data according to the head identifier. The invention also provides a multicast channel scrambling system with the internal and external encryption dual modes, which is used for scrambling the channels with the common safety requirement by adopting an internal encryption mode; the channel required by the high-level security level is scrambled in an external encryption mode, so that the video content is not illegally played, and the video can be played in the channel with the common security level under the condition that an uplink network cannot be communicated.
Description
Technical Field
The invention relates to the technical field of an interactive network television IPTV, in particular to a scrambling method and a scrambling system of video data in a single-direction and two-direction network environment.
Background
In the prior art, Multicast channel video data is transmitted by using Multicast, and there are two schemes:
1. multicast clear stream transmission: the multicast channel data is not scrambled and is directly sent to the client player, and all players with the multicast address can play without decryption.
2. All channels are encrypted, and a key needs to be acquired from the key management server, so that the client player is required to access the key management server at any time, and the channels cannot be played under the conditions that an uplink network is not communicated and a downlink network is communicated.
Disclosure of Invention
Aiming at the channels with common safety requirements, the invention adopts an internal encryption mode to scramble, adopts an external encryption mode to scramble the channels with high-level safety requirements, and can play the channels with common safety levels under the condition that an uplink network cannot be communicated.
In order to achieve the above object, the present invention provides an internal and external encryption dual-mode coexisting multicast channel scrambling system, comprising a channel production control center platform, a multicast forwarding server, a key management server, and a client player, wherein,
the channel production control center platform generates a corresponding multicast channel forwarding task request according to the security level grade of a channel preset by a user;
the multicast forwarding server analyzes the multicast channel forwarding task request, acquires an information source address and encryption parameters, and encrypts the multicast channel video data by using an internal encryption mode or an external encryption mode according to the encryption parameters;
the key management server receives, stores and manages the key version number and the key sent by the channel production control center platform; receiving a decryption request of the client player and sending a secret key to the client player;
and the client player analyzes the head identification of the encrypted multicast channel video data, and decrypts and plays the encrypted multicast channel video data according to the encryption mode.
Further, the channel production control center platform generates a multicast channel forwarding task request carrying encryption parameters; when the security level grade of the channel is a common security level, the encryption parameter comprises an inner encryption level grade parameter; when the security level of the channel is a high-level security level, the encryption parameters comprise an external encryption level parameter, a key version number and a key.
Further, the channel production control center platform sends the key version number and the key to the key management server.
Further, the multicast forwarding server sets the header identifier of the encrypted multicast channel video data to an inner encryption mode or sets the header identifier of the encrypted multicast channel video data to an outer encryption mode.
Further, the client player judges the head identifier of the video data of the encrypted multicast channel, and decrypts the video data of the encrypted multicast channel by using the built-in secret key when the head identifier of the video data of the multicast channel is in an internal encryption mode; when the head mark of the video data of the multicast channel is in the external encryption mode, the head mark sends decryption request information carrying a key version number and a login certificate to the key management server, and the external encryption decryption key is obtained to decrypt the video data of the encrypted multicast channel.
In order to achieve the above object, the scrambling method for multicast channels with coexisting internal and external encryption modes provided by the present invention comprises the following steps,
1) the channel production control center platform generates a corresponding multicast channel forwarding task request carrying encryption parameters according to the security level grade of the channel and sends the multicast channel forwarding task request to a multicast forwarding server;
2) the multicast forwarding server encrypts the video data of the multicast channel internally or externally according to the encryption parameters and sets a head identifier when encrypting the video data of the multicast channel;
3) and the client player receives the encrypted multicast channel video data, and decrypts and plays the encrypted multicast channel video data according to the head identifier.
Further, the step 1) further comprises,
when the security level is a common security level, the encryption parameters carried by the generated multicast channel forwarding task request comprise an inner encryption level parameter;
and when the security level is a high-level security level, the encryption parameters carried by the multicast channel forwarding task request comprise an external encryption level parameter, a key version number and a key.
Further, when the security level is a high level security level, the channel production control center platform sends the key version number and the key to the key management server.
Further, the step 2) further comprises,
the multicast forwarding server analyzes the multicast channel forwarding task request carrying the encryption parameters to obtain the encryption parameters and a channel information source address;
downloading multicast channel video data according to the channel information source address;
and confirming the internal encryption type according to the encryption parameters, carrying out internal encryption on the video data of the multicast channel, and setting the head identification of the encrypted video data of the multicast channel into an internal encryption mode.
Further, the step 2) further comprises,
the multicast forwarding server analyzes the multicast channel forwarding task request carrying the encryption parameters to obtain the encryption parameters and a channel information source address;
downloading multicast channel video data according to the channel information source address;
and confirming the external encryption type according to the encryption parameters, performing external encryption on the video data of the multicast channel, and setting the head identification of the encrypted video data of the multicast channel into an external encryption mode.
Further, the step 3) further comprises,
and when the head identification of the video data of the encrypted multicast channel is in the internal encryption mode, the client player decrypts and plays the video data of the encrypted multicast channel by using the built-in secret key.
Further, the step 3) further comprises,
the head mark of the video data of the encrypted multicast channel is in an external encryption mode, and the client player sends decryption request information carrying a key version number and a login certificate to the key management server; and acquiring an external encryption decryption key to decrypt the encrypted multicast channel video data.
The multicast channel scrambling method and the system with coexisting internal and external encryption modes adopt an internal encryption mode for scrambling channels with common safety requirements, adopt an external encryption mode for scrambling channels with high-level safety requirements, and can play the channels with common safety levels under the condition that an uplink network cannot be communicated; advanced Encryption Standard (AES) is employed, keys are distributed using https secure channels, and electronic CA (user credentials) verification is used to protect content from illegal playback.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a multicast channel scrambling system with coexistence of internal and external encryption modes according to the present invention;
fig. 2 is a flow chart of a scrambling method for a multicast channel with coexistence of an internal encryption mode and an external encryption mode according to the present invention;
FIG. 3 is a flow diagram of an inner encryption mode method according to the present invention;
FIG. 4 is a flow chart of a method of external encryption mode according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a block diagram of a multicast channel scrambling system with coexistence of internal and external encryption modes according to the present invention, and as shown in fig. 1, the multicast channel scrambling system with coexistence of internal and external encryption modes according to the present invention includes a channel production control center platform 101, a multicast forwarding server 102, a key management server 103, and a client player 104, wherein,
the channel production control center platform 101 receives the security level of the preset channel input by the user according to the service requirement, generates a corresponding multicast channel forwarding task request carrying the encryption parameter, and sends the multicast channel forwarding task request to the multicast forwarding server 102.
In the invention, if the received security level is a common security level, the channel production control center platform 101 generates a multicast channel forwarding task request, and the carried encryption parameters comprise an inner encryption level parameter; if the received security level is a high security level, the generated multicast channel forwards the task request, the encryption parameters carried by the task request include an external encryption level parameter, a key version number and a key, and the key version number and the key are sent to the key management server 103.
A multicast forwarding server 102, which receives a multicast channel forwarding task request carrying encryption parameters issued by a channel production control center platform 101, and analyzes the multicast channel forwarding task request to obtain an information source address and encryption parameters; acquiring multicast channel video data according to the information source address, and encrypting the multicast channel video data by using an internal encryption mode or an external encryption mode according to encryption parameters; the encrypted multicast channel video data is forwarded to the corresponding client player 104.
In the present invention, if the encryption parameter includes an inner encryption level parameter, the multicast forwarding server 102 sets the header identifier of the encrypted multicast channel video data to an inner encryption mode. The header identification of the multicast channel video data encrypted by the internal encryption mode comprises: an internal and external encryption identifier and an encryption identifier; wherein, the inner encryption mode is represented when the inner and outer encryption mark is 01, and the outer encryption mode is represented when the inner and outer encryption mark is 02; an encryption identifier, which represents no encryption when 00; and 01 indicates encryption.
And if the encryption parameters comprise an outer encryption level grade parameter, a key version number and a key, setting the head identification of the encrypted multicast channel video data to be in an outer encryption mode. The header identification of the multicast channel video data encrypted by using the external encryption mode comprises: an internal and external encryption identifier, an encryption identifier and a key version number; wherein, the inner encryption mode is represented when the inner and outer encryption mark is 01, and the outer encryption mode is represented when the inner and outer encryption mark is 02; an encryption identifier, which represents no encryption when 00; when 01, encryption is represented; the key version number is 4 bytes, e.g., 000A.
A key management server 103 which stores and manages the received key version number and key transmitted from the channel production control center platform 101; the request of the client player 104 is received, and the key is sent to the client player 104 after the login credentials are verified.
And the client player 104 receives the encrypted multicast channel video data sent by the multicast forwarding server 102, analyzes the header identifier of the encrypted multicast channel video data, judges the encryption mode, and decrypts and plays the encrypted multicast channel video data according to the judgment result.
If the analyzed head mark is an inner encryption mode, the client player 104 of the invention directly uses the built-in secret key to decrypt and play the video data of the encrypted multicast channel; if the analyzed head identifier includes an external encryption mode and a key version number, the decryption request information carrying the key version number and the login credentials is sent to the key management server 103 in an https manner, and the external encryption decryption key is obtained to decrypt and play the encrypted multicast channel video data.
Fig. 2 is a flowchart of a method for scrambling a multicast channel with coexistence of internal and external encryption modes according to the present invention, and the method for scrambling a multicast channel with coexistence of internal and external encryption modes according to the present invention will be described in detail with reference to fig. 2.
Firstly, in step 201, the channel production control center platform 101 receives the security level of the channel input by the user according to the service requirement;
in this step, the security level levels of the received channel include a general security level and an advanced security level.
In step 202, the security level of the channel is determined, and if the channel is a normal security level, the step 203 is performed, and if the channel is a high security level, the step 204 is performed.
In step 203, multicast forwarding server 102 encrypts the video data of the multicast channel in the inner encryption mode and sends the encrypted video data to client player 104.
In step 204, multicast forwarding server 102 encrypts the video data of the multicast channel in the outer encryption mode and sends the encrypted video data to client player 104.
In step 205, the client player 104 receives the encrypted multicast channel video data sent by the multicast forwarding server 102, decrypts the encrypted multicast channel video data, and plays the encrypted multicast channel video data.
Fig. 3 is a flowchart of an intra encryption mode method according to the present invention, and the intra encryption mode method of the present invention will be described in detail with reference to fig. 3.
Firstly, in step 301, the channel production control center platform 101 sends an internal encryption multicast channel forwarding task request to the multicast forwarding server 102; wherein, the task request for forwarding the internal encryption multicast channel carries the encryption parameter containing the grade parameter of the internal encryption level.
In step 302, the multicast forwarding server 102 parses the intra-encrypted multicast channel forwarding task request to obtain the encryption parameters and the channel source address.
In step 303, the multicast forwarding server 102 downloads the multicast channel video data according to the channel source address;
in step 304, the multicast forwarding server 102 confirms the internal encryption type according to the encryption parameter, performs internal encryption on the video data of the multicast channel, and sets the head identifier of the encrypted video data of the multicast channel to be in an internal encryption mode; the encrypted multicast channel video data is sent to the corresponding client player 104. The destination address and port forwarded by the multicast forwarding server 102 are derived from the corresponding parameter fields in the multicast channel forwarding task request.
The header identification of the multicast channel video data encrypted by the internal encryption mode comprises: an internal and external encryption identifier and an encryption identifier; wherein, the inner encryption mode is represented when the inner and outer encryption mark is 01, and the outer encryption mode is represented when the inner and outer encryption mark is 02; an encryption identifier, which represents no encryption when 00; and 01 indicates encryption.
In step 305, the client player 104 parses the received encrypted multicast channel video data, confirms the internal encryption type, and decrypts and plays the encrypted multicast channel video data using the internal key.
Fig. 4 is a flowchart of an outer cipher mode method according to the present invention, which will be described in detail with reference to fig. 4.
Firstly, in step 401, the channel production control center platform 101 sends an external encryption multicast channel forwarding task request to the multicast forwarding server 102, and sends a key version number and a key to the key management server 103; the external encryption multicast channel forwarding task request carries encryption parameters including an external encryption level grade parameter, a key version number and a key.
In step 402, the multicast forwarding server 102 parses the external encrypted multicast channel forwarding task request to obtain an encryption parameter and a channel source address.
In step 403, the multicast forwarding server 102 downloads the multicast channel video data according to the channel source address;
in step 404, the multicast forwarding server 102 confirms the external encryption type according to the encryption parameter, and uses the key to perform external encryption on the video data of the multicast channel according to the encryption parameter, and sets the head identifier of the external encryption mode at the head of the encrypted video data of the multicast channel; the encrypted multicast channel video data is sent to the corresponding client player 104. The destination address and port forwarded by the multicast forwarding server 102 are derived from the corresponding parameter fields in the multicast forwarding task request.
The header identification of the multicast channel video data encrypted by using the external encryption mode comprises: an internal and external encryption identifier, an encryption identifier and a key version number; wherein, the inner encryption mode is represented when the inner and outer encryption mark is 01, and the outer encryption mode is represented when the inner and outer encryption mark is 02; an encryption identifier, which represents no encryption when 00; when 01, encryption is represented; the key version number is 4 bytes, e.g., 000A.
In step 405, the client player 104 parses the received encrypted multicast channel video data, confirms the external encryption type, and sends the decryption request information carrying the key version number and the login credentials to the key management server 103; the key management server 103 parses the received decryption request information, verifies the login credential according to the key version number, and sends the key to the client player 104.
In step 406, the client player 104 decrypts and plays the encrypted multicast channel video data using the received key.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A multicast channel scrambling system with internal and external encryption dual modes coexisting comprises a channel production control center platform, a multicast forwarding server, a key management server and a client player,
the channel production control center platform generates a corresponding multicast channel forwarding task request according to the security level grade of a channel preset by a user;
the multicast forwarding server analyzes the multicast channel forwarding task request, acquires an information source address and encryption parameters, and encrypts the multicast channel video data by using an internal encryption mode or an external encryption mode according to the encryption parameters;
the key management server receives, stores and manages the key version number and the key sent by the channel production control center platform; receiving a decryption request of the client player and sending a secret key to the client player;
the client player analyzes the head identification of the encrypted multicast channel video data, and decrypts and plays the encrypted multicast channel video data according to the encryption mode;
the client player judges the head identification of the encrypted multicast channel video data, and decrypts the encrypted multicast channel video data by using the built-in secret key when the head identification of the multicast channel video data is in an internal encryption mode; when the head mark of the video data of the multicast channel is in the external encryption mode, the head mark sends decryption request information carrying a key version number and a login certificate to the key management server, and the external encryption decryption key is obtained to decrypt and play the video data of the encrypted multicast channel.
2. The system for scrambling multicast channels with coexistence of intra-and-inter-encryption dual modes as claimed in claim 1, wherein the channel production control center platform generates multicast channel forwarding task requests carrying encryption parameters; when the security level grade of the channel is a common security level, the encryption parameter comprises an inner encryption level grade parameter; when the security level of the channel is a high-level security level, the encryption parameters comprise an external encryption level parameter, a key version number and a key.
3. The dual internal and external encryption mode coexisting multicast channel scrambling system as claimed in claim 1, wherein said channel production control center platform transmits a key version number and a key to said key management server.
4. The dual mode intra-and-outer encryption coexisting multicast channel scrambling system as claimed in claim 1, wherein the multicast forwarding server sets a header id of the encrypted multicast channel video data to an intra-encryption mode or sets a header id of the encrypted multicast channel video data to an extra-encryption mode.
5. A scrambling method for multicast channels with coexisting internal and external encryption modes comprises the following steps:
1) the channel production control center platform generates a corresponding multicast channel forwarding task request carrying encryption parameters according to the security level grade of the channel and sends the multicast channel forwarding task request to a multicast forwarding server;
2) the multicast forwarding server encrypts the video data of the multicast channel internally or externally according to the encryption parameters and sets a head identifier when encrypting the video data of the multicast channel;
3) the client player receives the encrypted multicast channel video data, and decrypts and plays the encrypted multicast channel video data according to the head identifier;
said step 3) further comprises the step of,
when the head mark of the video data of the encrypted multicast channel is in an internal encryption mode, the client player decrypts and plays the video data of the encrypted multicast channel by using a built-in secret key;
when the head mark of the video data of the encrypted multicast channel is in an external encryption mode, the client player sends decryption request information carrying a key version number and a login certificate to a key management server; and acquiring an external encryption decryption key to decrypt and play the encrypted multicast channel video data.
6. The scrambling method for multicast channels with coexisting intra-and intra-encrypted dual modes as claimed in claim 5, wherein said step 1) further comprises,
when the security level is a common security level, the encryption parameter carried by the multicast channel forwarding task request comprises an inner encryption level parameter;
and when the security level is a high-level security level, the encryption parameters carried by the multicast channel forwarding task request comprise an external encryption level parameter, a key version number and a key.
7. The method as claimed in claim 6, wherein the channel production control center platform sends a key version number and a key to the key management server when the security level is a high level security level.
8. The dual mode intra-and-outer encryption coexisting multicast channel scrambling method as defined in claim 5, wherein said step 2) further comprises,
the multicast forwarding server analyzes the multicast channel forwarding task request carrying the encryption parameters to obtain the encryption parameters and a channel information source address;
downloading multicast channel video data according to the channel information source address;
and confirming the internal encryption type according to the encryption parameters, carrying out internal encryption on the video data of the multicast channel, and setting the head identification of the encrypted video data of the multicast channel into an internal encryption mode.
9. The scrambling method for multicast channels with coexisting internal and external encryption modes as claimed in claim 8, wherein said multicast forwarding server confirms the type of the internal encryption according to the encryption parameters, performs the internal encryption on the video data of the multicast channels, and sets the header id of the video data of the encrypted multicast channels to the internal encryption mode, including,
confirming that the encryption parameters comprise an inner encryption level grade parameter;
carrying out internal encryption on the video data of the multicast channel;
setting the head mark of the encrypted multicast channel video data as follows: an inner encryption identifier and an encryption identifier.
10. The dual mode intra-and-outer encryption coexisting multicast channel scrambling method as defined in claim 5, wherein said step 2) further comprises,
the multicast forwarding server analyzes the multicast channel forwarding task request carrying the encryption parameters to obtain the encryption parameters and a channel information source address;
downloading multicast channel video data according to the channel information source address;
and confirming the external encryption type according to the encryption parameters, performing external encryption on the video data of the multicast channel, and setting the head identification of the encrypted video data of the multicast channel into an external encryption mode.
11. The scrambling method of multicast channel coexisting in internally and externally encrypted dual modes as claimed in claim 10, wherein the multicast forwarding server confirms the external encryption type according to the encryption parameter, externally encrypts the multicast channel video data, and sets the header id of the encrypted multicast channel video data to an external encryption mode, including,
confirming that the encryption parameters comprise an external encryption level grade parameter;
carrying out external encryption on the video data of the multicast channel;
setting the head mark of the encrypted multicast channel video data as follows: an outer encryption identifier, an encryption identifier, and a key version number.
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| EP1954045A1 (en) * | 2007-01-30 | 2008-08-06 | BRITISH TELECOMMUNICATIONS public limited company | Method and system for providing video content |
| CN101447842A (en) * | 2008-09-27 | 2009-06-03 | 百视通网络电视技术发展有限责任公司 | Distributed digital rights management (DRM) system adopting 2-level framework |
| CN104661082A (en) * | 2015-02-04 | 2015-05-27 | 深圳创维数字技术有限公司 | Program source data protecting method and relating devices |
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| EP1954045A1 (en) * | 2007-01-30 | 2008-08-06 | BRITISH TELECOMMUNICATIONS public limited company | Method and system for providing video content |
| CN101447842A (en) * | 2008-09-27 | 2009-06-03 | 百视通网络电视技术发展有限责任公司 | Distributed digital rights management (DRM) system adopting 2-level framework |
| CN104661082A (en) * | 2015-02-04 | 2015-05-27 | 深圳创维数字技术有限公司 | Program source data protecting method and relating devices |
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