CN1452840A - Method and apparatus for enabling random access to individual pictures in encrypted video stream - Google Patents
Method and apparatus for enabling random access to individual pictures in encrypted video stream Download PDFInfo
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- CN1452840A CN1452840A CN00819492A CN00819492A CN1452840A CN 1452840 A CN1452840 A CN 1452840A CN 00819492 A CN00819492 A CN 00819492A CN 00819492 A CN00819492 A CN 00819492A CN 1452840 A CN1452840 A CN 1452840A
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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
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
- H04N21/23895—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
- H04N21/23897—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption by partially encrypting, e.g. encrypting only the ending portion of a movie
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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
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
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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
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
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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
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17318—Direct or substantially direct transmission and handling of requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17336—Handling of requests in head-ends
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Human Computer Interaction (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A system for providing conditional access to packetized picture (video), audio or other data. The system selectively encrypts packetized data such that transport packets that includes header data are unencrypted, while all other transport packets that do not include header data are encrypted. This allows the transport packets with the header data to be randomly accessed from a memory, which is particularly advantageous for performing "thick modes", such as fast forward and fast reverse, e.g., in a video-on-demand service. After the transport packets are selectively encrypted and stored, transport scrambling and control bits for each packet can be accessed to determine whether the packet is encrypted, and consequently, whether the packet includes header data.
Description
Background of invention
The present invention relates to a kind of packing data (packetized data) treatment system of encryption.The present invention is specially adapted to wherein to require to have motion control (" special-effect mode "), as video request program (video-on-demand, VOD) system of F.F. and fast reverse mould formula.
Video request program (VOD) is a kind of interactive video service, provides to Multipoint Distribution System via a point usually, and this system for example is a cable television system.By video on-demand system, the user is the content of order video (as: film, sports tournament or the like) or other types at any time, and the restriction of the listing of not predesignated.Global function VOD system can provide the motion control function that is similar to video cassette recorder (VCR) to the user, as: suspend (fixing), F.F., fall soon and fall slowly.These are called special play-back, special-effect mode again, the controlling level that reaches that or the function of motion control can deepen user's the impression of watching, and is equivalent to (or surmounting) user expectation with general video tape---for example those video tapes that can buy or lease usually---.
In the VOD system, play content is stored in video server, and this server is specialized high power capacity file server.After the user bought, content just can play back from the file that stores.For ease of multiplexed (remultiplexing) and error correction once more, digital video content is packaged in the fixed-size unit usually.Thereby meet the normally used Moving Picture Experts Group-2 of digital television (ITU-T Rec.H.222.0, ISO/IEC13818).
In order to implement motion control, the response of video server controller is from the motion control commands of set-top box, and the mode of change playing back content.In F.F. and fast reverse mould formula, video server is skipped selected image, produces the accelerating type video.According to the method that is adopted, must be able to carry out arbitrary access fast to the single image in the video file.In order to reduce storage demand and can control accelerator coefficient flexibly, extracting in real time from the normal video file of all images that comprises film or other programs usually is in image in F.F. and the fast inverted order row.
There are two kinds of methods to seek and browse the file that shows in (scan forward/backward) sequence in fast-forward/fast-rewind.At first need browse main video file in order, seek the starting point of image.Other method is to set up the secondary index file for the image starting point in the main video file.
But another problem that need solve is the access of control to the VOD program, with maintenance system feasibility economically.Specifically, carry out a kind of CA scheme, thereby refuse of the access of unwarranted each side service or content.CA requires to have a mechanism reliably, the user being categorized into different groups, and an execution mechanism (enforcement mechanism), to refuse the access of unwarranted user group.
Usually utilize and encrypt the access of controlling for content that carrier signal carries.Being used to encrypt the conventional method that VOD distributes content is to arrange real-time encrypted device on the transmission path between video server and the user.When number of users relatively more after a little while, this method is very effective.But, increase with number of users, the quantity of encryption device and the demand of physical space thereof are just become white elephant.This space problem is not present in traditional broadcast-type service, because all users share same content stream data, the quantity of encryption device does not increase with the increase of number of users.
The VOD content is carried out the pre-encryption that real-time encrypted a kind of alternative method is an off-line.In the method, before video server that video content is packed into, it is handled and encrypts.Pre-advantage of encrypting is, need not encryption device on the video transmission path, thereby has significantly reduced the cost of VOD service and made it have more scalability.Pre-encryption can be carried out in a content preparation set of sites, and this website separates with the position (headend) of configuration VOD service.When video after central location is encrypted in advance, same encryption copy just can be assigned to the configuration VOD a plurality of headends.
But the VOD content encrypted in advance produced a problem: it has hindered the detection to the starting point position of the single image in the video file.Usually, video server does not possess ability or the mandate that the video content to pre-encryption is decrypted.Therefore, they can not be only locate single image in the video file of encryption by scanning document.Similar problem can appear when being kept in the decoder before the content of encrypting is showing, with all images deciphering to locate specific image and need spended time and to calculate in a large number.
Therefore, need provide a kind of system that avoids the problems referred to above.
This system should support the single image in the encrypted video file is carried out arbitrary access, to be used for following pattern, as: F.F., fall, suspend, recover broadcasts, slow motion (advancing or playback) soon, broadcast or other delta frames advance (incremental frame advance) or browse that (as: N frame once advances frame by frame, N＞1 wherein), or the like.
This system should allow to dispose at lower cost safe video on-demand system.
This system should with packing data communication plan (for example MPEG-2) compatibility.
The present invention should with the user's set compatibility of storage encryption video file, as personal video recorder (PVR), PC hard disk or similar device.
The invention provides a kind of system with above-mentioned advantage and other advantages.
Summary of the invention
The present invention relates to a kind of packing data treatment system of encryption.
According to an aspect of the present invention,---for example video server---receives the step of input digital data a kind ofly to be used to provide the ad hoc approach of the packing data of encrypting to small part to comprise from data source.Input digital data comprises the coded data section that has corresponding data head (data header) in a large number, as: in Packet Elementary Stream (Packetized ElementaryStream, PES) data in the bag of mpeg compatible.Input digital data is segmented, be used for transmitting with continuous transmission bag, the invention provides at least two classes and transmit bag, wherein the first kind comprises at least a portion of related data head, and second class comprises that at least a portion of correlative coding data segment does not still comprise any part of data head.
Second class is transmitted bag encrypt, do not transmit bag and do not encrypt the first kind.Each is transmitted bag identifier (identifier) is set, show that each transmits packet encryption or does not encrypt.
This method allows by memory the transmission bag with header data to be carried out arbitrary access, and this is to carrying out " special-effect mode " in the video-on-demand service, for example F.F. and especially favourable soon.Comprise header data if transmit, then it is suitable for special-effect mode, because its starting point from video, audio frequency or other packets provides data.
In another aspect of the present invention, a kind of method of the packing data that small part is encrypted that decodes to comprises from transmitting the step that stream (transport stream) reception transmits bag continuously.Transmitting bag forms in the following manner: the first kind that numerical data is subdivided into (it comprises having the coded data section of data head separately in a large number) encryption transmits bag, and it comprises at least a portion of related data head; And second class of not encrypting transmission bag, it comprises at least a portion of correlative coding data segment, but does not comprise any part of data head.Transmit bag and be respectively arranged with identifier, show that each transmits packet encryption or does not encrypt.
Transmit bag and be stored in the storage device, identifier is used for transmitting bag from the storage device arbitrary access first kind, and need not to be decrypted.For example, can adopt personal video recorder or other user's sets of the transmission bag that stores the part encryption.After this, when the user wishes to check data, will transmit the bag deciphering again.
The present invention also provides corresponding device thereof.
Description of drawings
Fig. 1 shows the structure according to transmission bag of the present invention.
Fig. 2 shows according to encoder of the present invention.
Fig. 3 shows according to user's set/decoder of the present invention.
Embodiment
The present invention relates to a kind of encryption packing data treatment system.
Fig. 1 shows the structure according to transmission bag of the present invention.
For for simplicity, the present invention only is discussed in typical packing video format, for example embodiment in the MPEG-2 form.But the present invention is applicable to other number formats with similar features.
In the MPEG-2 form, video information had been carried out digitlization and compression before coding.The part that compression can be considered to encode.To be divided into unit from the compressed video of program 100, be called Packet Elementary Stream (PES) bag with variable-length, as: PES wraps 105 and 110, comprises the coded image of variable number in each bag.For example, PES bag 105 comprise coded image 119,121 ..., 124.
Example PES bag 105 has head 116 and payload (payload) part 117.In addition, each image in the PES bag 105 is a prefix with the head that comprises relevant image information all.For example, image 119 has head 118, and image 121 has head 120, and image 124 has head 123.
In order to transmit and to store data, the PES bag further is subdivided into the fixing unit of length, be called and transmit bag, as: transmit bag 130,140 and 150.According to Moving Picture Experts Group-2, each transmits bag and is made of 188 bytes.Usually, the length of PES bag is far longer than the size of transport stream packet.Each transmits bag and all has head and payload portions.Except other information, transmit packet header and comprise that also two are transmitted (scrambling) control bit of maintaining secrecy, and illustrate encryption (maintaining secrecy) state of bag.
In Moving Picture Experts Group-2, the secret control bit of encoding " transmits the control of maintaining secrecy " by field and specifies.It is unclassified that secret controlling value " 00 " expression transmits bag, and be worth " 01 ", " 10 " and " 11 " can be defined by the user.As example, represent the transmission bag of maintaining secrecy or encrypting at this adopted value " 11 ".Can adopt the similar scheme of any kind to represent to transmit the encrypted state of bag.
Transmit bag 130 and comprise head 131, secret control bit 132 (its expression unencrypted transmits bag) and payload 133.Transmit bag 140 and comprise head 141, secret control bit 142 (the transmission bag that its expression is encrypted) and payload 143.Transmit bag 150 and comprise head 151, secret control bit 152 (its expression unencrypted transmits bag) and payload 153.
The content of the continuous part by segmentation PES bag constitutes each and transmits bag.For example, the payload 133 of transmission bag 130 comprises the part of the view data 119 of PES head 116, picture headers 118 and PES payload 117.The payload 143 that transmits bag 140 comprises a continuous part of the view data 119 of PES payload 117.The payload 153 that transmits bag 150 comprises the part of the view data 121 of picture headers 120 and PES payload 117, or the like.
Note that Fig. 1 shown be reduced form, in actual applications, the data of an image carry with the payload that several transmit bag usually.In addition, image data amount (as: field 119,121,124) is far longer than corresponding picture headers data volume (as: being respectively field 118,120,123) usually.Therefore, most of bag that transmits only carries view data, and does not carry the picture headers data, thereby causes great majority to transmit packet encryption, and less relatively transmission bag is not encrypted.Therefore, the unwarranted user who is transferred to the program of most of process encryption just can't normally watch this program.
Transmit package and be combined into and transmit stream, and usually via satellite, cable or fiber/cable mixed network network be transported to user terminal (as: set-top box), but in fact can communicate as computer network via any network.If prepare at central content preparation website, then can be before being provided to user terminal, will transmit stream earlier provides to one or more headends.
Usually, can be in the central authorities preparations website or the headend preliminary date that for example are national service provider, perhaps each sales of the contents merchant can arrange its own content to prepare according to any special requirement of himself equipment.
As is generally known it is multiplexed transmitting stream, it forms by the transmission bag interleave configuration that will belong to one or more programs.The transmission bag that belongs to different programs in transmitting stream is distinguished by the Packet Identifier in its head (PID).A single programs transmits the transmission stream that stream includes only a program.
Fig. 2 shows according to encoder of the present invention.Encoder 200 comprises the equipment of carrying out the selectivity packet encryption.Apparatus shown for example can be positioned at central content preparation website or headend.
The present invention can overcome the image starting point orientation problem that is caused by pre-encryption.As mentioned above, this purpose realizes without encrypting by making some selected (the transmitting stream) bags in the video file.The equipment disposition 200 that realizes this purpose comprises one or more digital video sources 210, be used to generate preliminary treatment work station 215, encryption device 220, the encryption device controller 205 of the selected encrypted packet of auxiliary data file and mark, the optional reprocessing work station 225 that is used to handle encrypted video (as: adjusting the timing information of may encrypted program being upset) and the storage device of before data processed is provided to headend or end user it being stored 230.
In encoder configuration 200, digital video source 210 provides the digital video frequency flow that will encrypt.Video source can be a digital video code, or the file server of a playback pre encoded video file.Digital video frequency flow is fed to preliminary treatment work station 215, and its major function is that identification and mark are encrypted the transmission bag.The bag of selecting not comprise picture headers or its part is encrypted, so it need not the inspection through video server in motion control (special-effect mode).Be set to certain particular value (as: " 11 ") and come the selected transmission bag of encrypting of mark by transmitting secret control bit.
Equally, the bag that utilizes different particular value (as: " 00 ") to come mark not encrypt.Pre-treatment step generates auxiliary data file alternatively, to be used to transmit the VOD service.
Encryption through pretreated video flowing is carried out under the control of Setup Controller 205 by encryption device 220, and corresponding successively with the encryption Control Parameter.Can adopt any suitable encipherment scheme.Encrypt Control Parameter and for example can comprise information relevant and/or specific encryption dialogue with the program of being encrypted.When carrying out encryption, encryption device 220 checks that each transmits the secret control bit of transmission of bag.Two control bits are set to not encrypting of (for instance) " 00 ", are set to the then encryption of (for instance) " 11 ".
The output that will comprise the encryption device 220 of selective encryption video flowing is kept at before the storage device 230, can select to make it through a post-processing stages (as: work station 225).Reprocessing may need, and also may not need, according to the design of VOD service equipment and execution and decide.
For the image starting point in the pre-video file of encrypting of search in the special effects mode play process, video server each in the scan video file in order transmits bag.Each secret control bit of transmission that transmits in the packet header shows whether this bag is encrypted.If wrap encrypted, its include file head not of deducibility then.If it is encrypted that bag does not have, can check that then payload is with the positioning image head.
Video server also can read other kinds of information that embed in the pre-encrypted video file, as: the exclusive data (private data) in the self adaptation field of transmission packet header.
Fig. 3 shows according to a kind of user's set/decoder of the present invention.
Optionally, programme content can temporarily be stored in user's set/decoder before playing.This device can be personal video recorder, or other-end in the subscriber household or equipment, perhaps or even the portable unit that can be carried by the user or use on automobile.
For example, the user can buy or lease the storage device that comprises program and replay subsequently being used for, rather than plays in the specific time under the control of headend.In the situation of buying, the user can unrestrictedly replay, and under the situation of leasing, can only replay fixing number of times or replay in valid expiration date of user.
Perhaps, can give the user to select storage transmission stream before playing.
Therefore, the ability of the motion control of providing (as: special-effect mode) can be provided user's set/decoder 300.
Decoder 300 can comprise a demultiplexer (demux) 302, and its reception has encryption and unencryption transmits the transmission stream of bag (for example those are stored in the transmission bag in the storage device shown in Figure 2 before this), and optionally receives other program service.Do not show other important components among the figure, for example be used for the assembly of demodulation, error correction, function such as synchronous, but this assembly is conspicuous to those skilled in the art.
Demultiplexer 302 is extracted and is belonged to the encryption of specific program or the bag of not encrypting.The transmission stream of carrying the bag of extracting out is stored in memory 310, perhaps offers second demultiplexer 305, and its transmission bag that will encrypt transmits bag with unencrypted to be separated.For example: complete film etc. is stored in memory 310, for retrieval and motion control subsequently.Memory 310 is similar to storage device shown in Figure 2 210.
Whether demultiplexer 305 comprises a secret control bit identifier/detector 306, is used to discern the secret control bit that each transmits bag, encrypt to determine this bag.
Controller 335, for example CPU (CPU) provides the monitoring to various functions in the decoder 300.
User interface 340 receives (for example passing through hand-held remote control unit) instruction that the user sends, so that watch program with ordinary playing pattern or special-effect mode.When this request of response, interface 340 provides corresponding signal to controller 335, and command memory 310 outputs to demultiplexer 305 with bag.The unencryption bag that video/audio/data function blocks 320 receives from decipher 315 and demultiplexer 305.
To be provided to output device 325 from the data of function 320, as: television set, personal computer, loud speaker, or the like.Output device 325 can provide graphic user interface (GUI) or other mechanism, and assisting users is with normal or special effects mode play programme content.The user also can subscribe program by this interface.
Optionally upstream transmission device 330 is transferred to headend or other network control facilities with user's request (as: subscribing the VOD program).User's request can be via transmitting the identical or different Channel Transmission of stream with reception.
Should be appreciated that now, the invention provides a kind of system that is used for image, audio frequency or other data of CA packing.Packing data is optionally encrypted by this system, makes the transmission bag that comprises header data not encrypted, and does not comprise that other all transmission Bao Ze of header data are encrypted.This system's permission arbitrary access from memory comprises the transmission bag of header data, and this is for carrying out special-effect mode in video-on-demand service, and for example F.F. is with fast, especially favourable.
Especially, after optionally encrypting and store the transmission bag, but the transmission of each bag of access is maintained secrecy and control bit determines whether this bag is encrypted, and determines subsequently whether this bag comprises header data.If a bag comprises header data, then it is applicable to special-effect mode, because its starting point from video, audio frequency or other packets provides data.
Although combine various certain embodiments when of the present invention, it will be understood by a person skilled in the art that, in not breaking away from the spirit and scope that claims of the present invention advocate, when carrying out various adjustment and modification to the present invention in explanation.
For example, the transmission bag of selective encryption need not to be transferred to user terminal, but can be transferred to a storage device, and for example personal video recorder (PVR) is being retrieved thereafter for the user.
Claims (29)
1. one kind is used to provide the method to the packing data of small part encryption, and its step comprises:
(a) reception is from the input digital data of data source;
Wherein this input digital data comprises a plurality of coded data sections of data head separately that have;
(b) described input digital data is segmented so that transmit with continuous transmission bag, thereby provide at least two classes to transmit bag, wherein the first kind comprises at least a portion of related data head, and second class comprises at least a portion of correlative coding data segment but do not comprise any part of described data head;
(c) described second class is transmitted bag and encrypt, do not encrypt and the described first kind is not transmitted bag; And
(d) described transmission bag is provided with identifier respectively, encrypts or do not encrypt to show that this transmission bag is respectively.
2. method according to claim 1, wherein: described second class transmits in the bag has data that comprise from a plurality of described data segments at least.
3. method according to claim 1, wherein: in the Packet Elementary Stream bag, receive described input digital data.
4. method according to claim 1, wherein: in the head separately of each described transmission bag, identifier is set.
5. method according to claim 1, its step further comprises:
Described transmission bag is stored in the storage device;
Wherein said identifier makes it possible to from described storage device the described first kind of arbitrary access and transmits bag and need not to be decrypted.
6. method according to claim 5, its step further comprises:
At least one described first kind of arbitrary access transmits bag, so that the special-effect mode of described transmission bag to be provided.
7. method according to claim 6, wherein said special-effect mode comprises following at least a: F.F., slow-motion, fall, fall slowly, suspend, recover to play and the delta frame motion soon.
8. method according to claim 5, wherein: described storage device comprises a video server.
9. method according to claim 1, its step further comprises:
Described transmission bag is stored in the storage device; And
According to user's request, from described storage device, retrieve described transmission bag, and this transmission bag that is retrieved is offered the user by network.
10. method according to claim 9, wherein: in video-on-demand service, the described transmission bag that is retrieved is offered this user.
11. method according to claim 9, its step further comprises:
Be provided for deciphering the information that described second class transmits bag to described user; And
Transmit bag and provide demonstration by the described first kind through described second class transmission bag of deciphering.
12. method according to claim 1, wherein: described data source comprises a digital video code.
13. method according to claim 1, wherein: described data source comprises the file server of a playback through the video file of precoding.
14. method according to claim 1, wherein: at least one described first kind transmits at least a portion that also comprises a correlative coding data segment in the bag.
15. method according to claim 1, wherein: described input digital data comprise video and voice data at least one of them.
16. method according to claim 1 wherein, provides the described transmission bag with corresponding described identifier at central content preparation website, to be assigned at least one user network headend subsequently.
17. a method that decodes to the packing data that small part is encrypted, its step comprises:
(a) receive transmission bag continuously from transmitting stream; Wherein
This transmission bag forms in the following manner: will comprise a plurality ofly having separately the coded data section of data head and be subdivided at least two classes and transmit bag, wherein the first kind transmits at least a portion that comprises the related data head, and second class transmits any part that comprises at least a portion of correlative coding data segment but do not comprise described data head;
Described second class is transmitted packet encryption, and described first kind transmission bag is not encrypted; And
Described transmission bag is provided with identifier respectively, encrypts or do not encrypt to show that this transmission bag is respectively;
(b) described transmission bag is stored in the storage device; And
(c) utilize described identifier at least one described first kind of arbitrary access from this storage device to transmit bag, and need not to be decrypted.
18. method according to claim 17, wherein: at least some described second classes transmit the data that comprise from a plurality of described data segments.
19. method according to claim 17, wherein: the described numerical data in the Packet Elementary Stream bag is segmented.
20. method according to claim 17, the wherein said step of utilizing comprises: by the corresponding head recovery described identifier separately of each described transmission bag.
21. method according to claim 17, wherein: at least one described first kind of arbitrary access transmits bag, so that the special-effect mode of this transmission bag to be provided.
22. method according to claim 21, wherein said special-effect mode comprises following at least a: F.F., slow-motion, fall, fall slowly, suspend, recover to play and the delta frame motion soon.
23. method according to claim 17, wherein: described storage device comprises a decoder memory.
24. method according to claim 17, wherein: in video-on-demand service, described transmission bag is offered the user.
25. method according to claim 17, its step further comprises:
Described second class is transmitted the bag deciphering; And
Transmit bag and provide demonstration by the described first kind through described second class transmission bag of deciphering.
26. method according to claim 17, wherein: at least one described first kind transmits at least a portion that also comprises a correlative coding data segment in the bag.
27. method according to claim 17, wherein: described numerical data comprise video and voice data at least one of them.
28. one kind is used to provide the device to the packing data of small part encryption, it comprises:
Be used to receive device from the input digital data of data source;
Wherein this input digital data comprises a plurality of coded data sections of data head separately that have;
Described input digital data is segmented so that transmit with continuous transmission bag, thereby provide at least two classes to transmit bag, wherein the first kind comprises at least a portion of related data head, and second class comprises at least a portion of correlative coding data segment but do not comprise any part of described data head;
Be used for described second class is transmitted the device that bag is encrypted and described first kind transmission bag is not encrypted; And
Be used for that described transmission bag is provided with identifier (identifier) respectively and be respectively the device of encrypting or not encrypting to show this transmission bag.
29. a device that is used to decode to the packing data that small part is encrypted, it comprises:
Be used for receiving the device that transmits bag continuously from transmitting stream; Wherein
This transmission bag forms in the following manner: will comprise a plurality ofly having separately the coded data section of data head and be subdivided at least two classes and transmit bag, wherein the first kind transmits at least a portion that comprises the related data head, and second class transmits any part that comprises at least a portion of correlative coding data segment but do not comprise described data head;
Described second class is transmitted packet encryption, and described first kind transmission bag is not encrypted; And
Described transmission bag is provided with identifier respectively, encrypts or do not encrypt to show that this transmission bag is respectively;
Be used for described transmission bag is stored in the device of a storage device; And
The device that utilizes described identifier at least one described first kind of arbitrary access from this storage device to transmit bag and need not to be decrypted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2000/011891 WO2002015579A1 (en) | 2000-05-02 | 2000-05-02 | Method and apparatus for enabling random access to individual pictures in an encrypted video stream |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1452840A true CN1452840A (en) | 2003-10-29 |
Family
ID=21741343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00819492A Pending CN1452840A (en) | 2000-05-02 | 2000-05-02 | Method and apparatus for enabling random access to individual pictures in encrypted video stream |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1275250A1 (en) |
| KR (1) | KR20020091254A (en) |
| CN (1) | CN1452840A (en) |
| AU (1) | AU2000248144A1 (en) |
| CA (1) | CA2408232C (en) |
| WO (1) | WO2002015579A1 (en) |
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| CN1260642C (en) * | 2002-11-18 | 2006-06-21 | 深圳市朗科科技有限公司 | Method for transmitting command and data to portable storage device |
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-
2000
- 2000-05-02 CA CA002408232A patent/CA2408232C/en not_active Expired - Fee Related
- 2000-05-02 CN CN00819492A patent/CN1452840A/en active Pending
- 2000-05-02 AU AU2000248144A patent/AU2000248144A1/en not_active Abandoned
- 2000-05-02 EP EP00930295A patent/EP1275250A1/en not_active Withdrawn
- 2000-05-02 KR KR1020027014574A patent/KR20020091254A/en not_active Application Discontinuation
- 2000-05-02 WO PCT/US2000/011891 patent/WO2002015579A1/en not_active Application Discontinuation
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2408232C (en) | 2008-01-15 |
| WO2002015579A1 (en) | 2002-02-21 |
| KR20020091254A (en) | 2002-12-05 |
| AU2000248144A1 (en) | 2002-02-25 |
| EP1275250A1 (en) | 2003-01-15 |
| CA2408232A1 (en) | 2002-02-21 |
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