摘要:
A key management, user registration and deregistration for a digital rights management (DRM) system in a home network, using a hierarchical node topology. In the key management, node information is generated by allocating a pair of keys (a public key and a private key) to each node. A node tree is made by generating link information using the pair of keys and a content key. The link information is delivered from an upper node to a lower node using the node tree. The link information is obtained by encrypting a private key of a ‘TO’ node using a public key of a ‘FROM’ node. Accordingly, it is possible to realize a DRM system that protects content and easily accomplishes a binding mechanism and a revocation mechanism.
摘要:
A method of surface modifying a polyimide film, a method of manufacturing a flexible copper clad laminate using the same, and a flexible copper clad laminate (FCCL) having a two-layer structure manufactured thereby. The method of surface modifying a polyimide film is conducted by modifying the surface of a polyimide film through a first plasma treatment, dipping the polyimide film into a solution containing an ethyleneimine-based silane coupling agent prepared by mixing the compound of Formula 1 and the compound of Formula 2 at a molar ratio of with 0.25˜1, and then modifying the surface of the polyimide film through a second plasma treatment. The method of surface modifying a polyimide film is advantageous because it may be substituted for a conventional surface treatment processes using ion beams. Also, the FCCL having a two-layer structure, formed by conducting copper sputtering and electroplating on the surface modified polyimide film, has good adhesive strength between the polyimide film and the copper foil and can maintain such adhesive strength even at high temperatures for a long period of time. Further, it may be usefully applied to electronic parts, such as flexible printed circuit boards, TCP (Tape Carrier Package), COF (Chip On Film), etc.
摘要:
Provided is a method of controlling content access in a home network. The method includes: (a) defining a predetermined sub group and allocating a sub group key for the sub group; and (b) checking whether a user belongs to the sub group and transmitting the sub group key to a user device requested by the user, wherein the user device obtains an encrypted content key using a domain key and the sub group key. Since a content key is twice encrypted using a domain key and a sub group key and transmitted to a user device, it is possible to provide authorized content access to a user.
摘要:
A method for transmitting content to a user device from a home server in a home network is provided. The method includes: receiving an allocated user public key and a user private key of a user to whom the home server belongs; generating an arbitrary session public key and a session private key, generating an encrypted session private key by encrypting the session private key using a device public key that is a public key of the user device, and transmitting the encrypted session private key to the user device; and transmitting the content encrypted using a predetermined content key and a content key encrypted using the session private key to the user device. According to the method, by binding the content to each user, instead of to each device, the content can be safely and conveniently shared.
摘要:
A method of backing up domain information relating to the construction of a domain is provided. In the method, the domain information is encrypted and the encrypted domain information is stored in a predetermined storage device in the domain the encrypted domain information to the predetermined storage device, thereby securely backing up the domain information without the help of an external network. Accordingly, even when the existing domain server malfunctions, a new domain server is capable of obtaining the domain information.
摘要:
A method of receiving a session key in a home network and a method of reproducing content using the same. The method of receiving a session key from a home server in a home network, includes: (a) whenever one of members of the home network changes, receiving and storing the session key and a session version indicating a session key generation sequence; (b) receiving a license necessary for reproducing predetermined content; and (c) determining a session key necessary for reproducing the predetermined content based on an encoding session version (ESV), which is a session version extracted from the license, and the stored session version. A home server transmits a session key and a session version to a user device whenever a subscriber to a home network changes, and the user device determines a session key using the session version, thereby performing a variety of domain administration by freely transmitting content between user devices.
摘要:
A scheduled recording method, which schedules recording of copy-protected content, is provided. The scheduled recording method involves determining whether copy control information of content of interest exists in a recording device storing various copy control information; if the copy control information does not exist in the recording device, newly receiving copy control information and then determining whether the copy control information exists among the newly received information; if the copy control information of the content exists in the recording device, determining whether the copy control information “copy never”; and if the copy control information of the content is “copy never”, transmitting an error message to a user indicating that the content of interest is not recordable to a user. Accordingly, it is possible to let a user know about whether content is recordable by defining a copy protection status variable and determining whether the content is recordable whenever new copy control information is received.
摘要:
An analog/digital signal processor outputting analog input signals without eliminating copy protection signals from analog input signals, analog input signals having been subjected to copy protection process such as macrovision without adding complicated processes. The analog/digital signal processor for receiving input signals and outputting received input signals to a predetermined appliance through an analog or a digital communication unit, includes: a control unit determining whether the input signals are digital or analog signals and controlling a processing path and an output path of the input signals in accordance with the determination result; and a switching unit switching the input signals to the analog or the digital communication unit under the control of the control unit. When the input signals are analog signals, the control unit sets the processing path of the input signals to the switching unit and the switching unit switches the input signals to the analog communication unit.
摘要:
A method and apparatus for encrypting or decrypting digital content are provided. In the method, a binding range is selected from a plurality of binding ranges of content use based on license information of the content, and the content is encrypted based on the selected binding range so that the content can be used only within the selected binding range. Accordingly, it is possible to limit content use to a plurality of binding ranges of use of the content, using license information of the content.
摘要:
A method of and apparatus for encrypting and/or decrypting content according to broadcast encryption scheme. The decryption method includes: determining whether or not a revoked device among devices that have licenses for predetermined content is present; and according to the determination result, selectively decrypting a content key encrypted by using a key to prevent the revoked device from decrypting the predetermined content. By doing so, an unnecessary encryption process and decryption process that occur when there is no revoked device are avoided.