摘要:
A rate control method per block for a video encoder, includes estimating an average bit rate of a block; and determining a variation of a quantization coefficient such that an objective function based on the difference between an objective bit rate and the estimated average bit rate is minimized.
摘要:
Provided are an apparatus and method for generating digital cinema content and an apparatus and method for playing digital cinema content. The method of playing digital cinema content using a digital cinema package (DCP) including frame data having a first resolution and length information about frame data having a second resolution lower than the first resolution, and a key delivery message (KDM) includes obtaining a material exchange format (MXF) file and a decryption key by parsing the DCP and the KDM, extracting an encrypted triplet from the MXF file, extracting the length information about the second-resolution frame data using the encrypted triplet and the decryption key, decrypting an amount of data required to decrypt the second-resolution frame data in the first-resolution frame data using the length information about the second-resolution frame data, and decoding the decrypted second-resolution frame data.
摘要:
Provided are an apparatus and method for generating digital cinema content and an apparatus and method for playing digital cinema content. The method of playing digital cinema content using a digital cinema package (DCP) including frame data having a first resolution and length information about frame data having a second resolution lower than the first resolution, and a key delivery message (KDM) includes obtaining a material exchange format (MXF) file and a decryption key by parsing the DCP and the KDM, extracting an encrypted triplet from the MXF file, extracting the length information about the second-resolution frame data using the encrypted triplet and the decryption key, decrypting an amount of data required to decrypt the second-resolution frame data in the first-resolution frame data using the length information about the second-resolution frame data, and decoding the decrypted second-resolution frame data.
摘要:
A group key management method for secure multicast communication includes: creating a tree having a root node, internal nodes and leaf nodes to manage group keys of a receiver group by a group key management server; generating user keys of all nodes excluding the root node in the tree on the basis of Chinese Remainder Theorem; assigning the leaf nodes of the tree to users of the receiver group; and sending the user keys of the leaf nodes to the corresponding users for group key management. Further, the group key management method for secure multicast communication includes generating group keys of all non-leaf nodes; computing a solution of congruence equations based on the user key and group key by using Chinese Remainder Theorem for each non-leaf node; and multicasting a group key update message to each user of the respective leaf nodes.
摘要:
An apparatus for digital home domain management includes a home domain server which manages in one user domain all user terminals within a home group and provides each user terminal with a domain license in contents; and a DRM coupler which provides the contents and domain licenses converted to conform to a DRM type loaded in user terminals if contents sharing is requested among user terminals loaded with different DRMs within the home group.
摘要:
An apparatus for protecting contents streamed through re-transmission, includes a content service site for servicing a content, managing end user and re-sender re-transmitting the content streamed from the content service site to another user, and issuing and managing a re-transmission license and a content license. The end user pays a charge to the content service site, receives an issued license from the content service site, and uses the content received from the re-sender through re-transmission.
摘要:
An apparatus for sharing content between devices by using a domain digital rights management (DRM) includes: a domain management unit for performing management of a domain within a specific area and registration of users and user devices; a user management unit for managing information about the users of the domain registered by the domain management unit; and a device management unit for managing domain clients of the domain registered by the domain management unit. The apparatus further includes a DRM management unit that has DRM information that supports the domain created through the domain management unit and update information about each DRM, and relays such that DRM content stored in each domain client is converted into domain DRM content and domain DRM license.