Method and apparatus for protecting scalable video coding contents
AssigneesKorean Broadcasting System, Korea Advanced Institute of Science and Technology
InventorsKeun Soo Park, Keun Sik Lee, Sang Jin Hahm, Byung Sun Kim, Mun Churl Kim
Life of this patent
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Abstract
Disclosed are a method and apparatus capable of reducing the computational complexity of encryption and decryption by encrypting only data of scalable video coding contents for each coding layer in terms of temporal, spatial, and SNR scalabilities to provide a service for protected scalable video coding contents, and capable of protecting contents by generating and distributing an encryption key for encryption and decryption depending on a class of a contents consumer.
Claims22
A method for protecting scalable video contents in a scalable video coding contents providing system that encrypts and provides scalable video contents requested by a scalable video user terminal, the method comprising:
- receiving the requested scalable video contents;
- storing the received scalable video contents in a scalable video contents archive and controlling to perform authentication and generate an encryption key to be sent to the user;
- performing the authentication and generating the encryption key;
- imaging a scalable video in response to the request and coding the imaged scalable video contents, the coded scalable video contents comprising a plurality of scalability layers;
- encrypting only a portion of the plurality of scalability layers of the coded scalable video contents using the generated encryption key, resulting in encrypted scalable video coding contents, wherein the encrypting comprises selectively encrypting a disassembled low-pass filtered picture of the lowest layer or a high-pass filtered picture of an upper layer with respect to a temporally disassembled picture of an input video of a base layer;
- generating encryption information metadata for the encrypted scalable video coding contents;
- and
- transmitting the encrypted scalable video coding contents and the generated encryption information metadata to the scalable video user terminal via a network or a storage medium.
A scalable video coding contents providing system for protecting scalable video contents requested by a scalable video user terminal, the system comprising at least one computer system, including at least one processor, the system further comprising:
- a user contents request information receiving unit for receiving the requested scalable video contents;
- a scalable video contents service control unit for storing the received scalable video contents in a scalable video contents archive and controlling to perform authentication and generate an encryption key to be sent to a user;
- a user authenticating and encryption key control unit for performing the authentication and generating the encryption key;
- an imaging unit for imaging a scalable video in response to the request;
- a scalable video coding unit for coding the imaged scalable video contents, the coded scalable video contents comprising a plurality of scalability layers;
- a scalable video coding data encryption unit for encrypting a portion of the plurality of scalability layers of the coded scalable video contents using the generated encryption key, such that at least a second portion of the plurality of scalability layers of the coded scalable video contents is not encrypted, resulting in encrypted scalable video coding contents, wherein the scalable video coding data encryption unit for encrypting the coded scalable video contents using the generated encryption key encrypts the coding data of temporal, spatial, and SNR scalability layers or encrypts a combination of the temporal, spatial, and SNR scalability layers;
- an encryption information metadata generation unit for generating encryption information metadata for the encrypted scalable video coding contents;
- and
- an encrypted scalable video coding contents and encryption information metadata transmission unit for transmitting the encrypted scalable video coding contents and the generated encryption information metadata to the scalable video user terminal via a network.
A scalable video user terminal for protecting encrypted scalable video coding contents and encryption information metadata by decrypting and decoding the same, the terminal comprising:
- at least one computer system including at least one processor;
- an encrypted scalable video metadata parsing unit for parsing received encryption information metadata to obtain an encryption key and encryption information;
- a scalable encrypted video decryption unit for decrypting an encrypted portion of received encrypted scalable video coding contents using the encryption key and encryption information, wherein the scalable encrypted video decryption unit decrypts temporal, spatial, and SNR scalability layers or decrypts a combination of the temporal, spatial, and SNR scalability layers, and wherein the encrypted scalable video coding contents comprises the encrypted portion and an unencrypted portion;
- a scalable video decoding unit for decoding the decrypted scalable video contents;
- and
- a scalable decoded video rendering unit for rendering and reproducing the decoded scalable video contents.
An apparatus for protecting scalable video coding contents, the apparatus comprising at least one computer system including at least one processor, the apparatus further comprising:
- an input unit for dividing and inputting input video data acquired in response to a request from a video user terminal into at least one of temporal, spatial, and SNR scalability layers;
- a coding unit for coding the input video data of at least one of the temporal, spatial, and SNR scalability layers;
- an encryption unit for encrypting only a portion of video data of the coded temporal, spatial, and SNR scalability layers, wherein the encryption unit selectively encrypts a disassembled low-pass filtered picture of the lowest layer or a high-pass filtered picture of an upper layer with respect to a temporally disassembled picture of an input video of a base layer;
- a generation unit for generating metadata for the video data of the encrypted temporal, spatial, and SNR scalability layers;
- and
- a storage unit for combining and storing the encrypted coding data of the temporal, spatial, and SNR scalability layers and the generated metadata.
A method for protecting scalable video coding contents, the method comprising:
- dividing and inputting input video data acquired in response to a request from a video user terminal into at least one of temporal, spatial, and SNR scalability layers;
- coding the input video data of the at least one of the temporal, spatial, and SNR scalability layers;
- encrypting the video data of the coded temporal, spatial, and SNR scalability layers, wherein the encrypting of the video data of the coded temporal, spatial, and SNR scalability layers comprises encrypting each of the coding data of the temporal, spatial, and SNR scalability layers or any combination of the temporal, spatial, and SNR scalability layers;
- generating metadata for the video data of the encrypted temporal, spatial, and SNR scalability layers;
- and
- combining and storing the encrypted coding data of the temporal, spatial, and SNR scalability layers and the generated metadata.
A method for protecting scalable video coding contents, the method comprising:
- dividing input video data into at least one of temporal, spatial, and SNR scalability layers;
- coding the input video data of the at least one of the temporal, spatial, and SNR scalability layers;
- grouping bit-streams for the input video data of the coded temporal, spatial, and SNR scalability layers as a combination of the at least one temporal, spatial, and SNR scalability layers to form tiers;
- encrypting one or more of the formed tiers, wherein the encrypting of the one or more of the formed tiers comprises encrypting each of the coded temporal, spatial, and SNR scalability layers or any combination of the temporal, spatial, and SNR scalability layers;
- and
- generating encryption information for the encrypted tiers as metadata.
Dependencies are inferred from the claim text.