摘要:
A method and apparatus for managing digital content are provided. The apparatus for managing digital content generated by applying digital rights management (DRM) includes: a content execution unit executing digital content; and a control unit confirming whether or not digital content is in a first period in which the digital content can be normally executed, and controlling the content execution unit so that, if the digital content is in the first period, the digital content can be executed normally, and if the digital content is in a second period which is not in the first period, the digital content can be executed in a manner which can be distinguished from that of execution in the first period. According to the apparatus and method, execution of digital content, which is close to expiration, can be controlled, thereby managing the expiration of the digital content for a user.
摘要:
A portable memory apparatus having a content protection function is provided. The portable memory apparatus includes a memory and a memory control unit. The memory includes a read-only memory area which stores content and is set to so that only read operations are allowed, a writable memory area which is set so that read and write operations are allowed, and a special memory area which stores information needed to operate the portable memory apparatus and is set so that only authenticated programs are allowed to read from and/or write to the special memory area. The memory control unit controls the read and write operations on each of the areas.
摘要:
A reproduction method capable of immediately revoking a leaked device key by dividing the device key into a first partial key and a second partial key is provided. The reproduction method includes the operations of receiving encrypted content to be reproduced, requesting a token for decrypting the received content from an external device containing a first partial key of a device via a network, receiving the requested token from the external device, and decrypting the received token by using a second partial key contained in the device, thereby preventing content encrypted and distributed before revocation of an illegally copied device from being reproduced, and minimizing damage due to key leakage.
摘要:
A method of decoding/encoding a content file is provided. The method of decoding a content file includes dividing an encoded content file into a plurality of data blocks, grouping the plurality of data blocks into a plurality of groups, generating a group content key for each of the plurality of groups, generating a plurality of block keys for the data blocks in each of the plurality of groups from the group content key generated for each of the plurality of groups, and decoding the plurality of data blocks using the plurality of block keys.
摘要:
Provided are a method and apparatus for generating separate rule data using a database management system (DBMS) based language in order to efficiently manage usage rules of content. The method of providing usage rule data of content included in a mobile storage medium connected to a content reproduction device, the method includes: generating first rule data that is a set of rules used to manage the usage rule data based on a data structure of a database management system (DBMS); and generating second rule data that is a set of rules used to access the usage rule data using the first rule data.
摘要:
Provided is a method of conditionally decrypting content. In the method, whether a content key for encrypting and/or decrypting content is revoked is determined, and encrypted content is selectively decrypted using the content key.
摘要:
A mobile apparatus and method for displaying an Augmented Reality (AR) in the mobile apparatus. The mobile apparatus captures an image of a current environment of the mobile apparatus, displays the image, detects mapping information corresponding to the current environment from among mapping information stored in the mobile apparatus, maps a three-dimensional (3D) Graphical User Interface (GUI) of detected mapping information onto the displayed image, based on a relative location relationship between the detected mapping information, and adjusts a display status of the 3D GUI, while maintaining the relative location relationship between the detected mapping information.
摘要:
Provided are a method of tracing a device key in a user key management system using a hierarchical hash chain broadcast encryption scheme (HBES) algorithm, a user key management system for executing the method of tracing a device key, and a computer program for executing the method of tracing a device key. The method of tracing a device key of an illegal decoder in a user key management system for broadcast encryption includes: tracing a device key using a binary search; and revoking the traced device key. The technology according to the present invention can be applied to prevent exposure of the device keys to hacking. The present invention provides a method of tracing which can be applied to an HBES algorithm structure.
摘要:
Provided is a contents decoding method using a digital rights management (DRM) card. The method of decoding contents received from a host device connected with a DRM card storing DRM software includes: receiving encrypted contents information from the host device and granting a contents decoding request; executing the DRM software corresponding to the contents information and decoding the received contents; and transmitting the decrypted contents to the host device, thereby using various pieces of contents regardless of a DRM system set in contents and easily upgrading DRM software to defend against hacking. Further, a host device does not require DRM software, which enables mass production and reduces manufacturing costs.