Abstract: A scrambling apparatus and method are provided for increasing randomness without damaging compression efficiency of total video data by selectively and randomly performing conversion when converting motion vector codes of compressed video data into other motion vector codes indicating other motion vector values, and more particularly, by performing conditional conversion only if a predetermined condition is satisfied when selective conversion of motion vector codes is performed. The scrambling apparatus includes a conversion motion vector code table generator generating a conversion motion vector code table comprising motion vector codes obtained by converting motion vector codes corresponding to motion vector values of input video data in a standard motion vector code table; and a conversion controller randomly determining whether a certain motion vector value is encoded using the conversion motion vector code table or the standard motion vector code table.

Abstract: A method and apparatus are provided for simply and securely limiting a number of times that contents can be accessed using a hash chain. The apparatus limiting a number of times contents are accessed by a user terminal includes a hash chain generator receiving information indicating selected contents by the user terminal and information indicating how many times (n) the user terminal has authority to access the selected contents and generating a hash chain including n hash values derived from a seed value, and a contents access manager deleting the hash values one by one from the hash chain whenever the user terminal accesses the selected contents such that the number of times the contents can be accessed by the user terminal is decreased by the number of deleted hash values.

Abstract: The present invention relates to a pyridazinone derivative which can be used as a caspase inhibitor, process for the preparation thereof, and pharmaceutical composition for inhibiting caspase comprising the same.

Abstract: The present invention relates to a pyridone derivative which can be used as a caspase inhibitor, process for the preparation thereof, and pharmaceutical composition for inhibiting caspase comprising the same.

Abstract: The present invention relates to a pyridazinone derivative which can be used as a caspase inhibitor, process for the preparation thereof, and pharmaceutical composition for inhibiting caspase comprising the same.

Abstract: The present invention relates to an isoxazoline derivative as an inhibitor against various caspases, a process for preparing the same, and a therapeutic composition for preventing inflammation and apoptosis comprising the same.

Abstract: The present invention relates to an isoxazoline derivative as an inhibitor against various caspases, a process for preparing the same, and a therapeutic composition for preventing inflammation and apoptosis comprising the same

Abstract: A method and apparatus are provided for protecting software by randomly distributing software code. The software protecting method includes: dividing software code into a plurality of protecting code fields and a plurality of general code fields; selecting at least one field to be shuffled among the protecting code fields and selecting at least one seed field among the general code fields; and shuffling codes of the selected field to be shuffled according to a shuffling rule generated using a random number generator on the basis of a code value of the selected seed field.

Abstract: The present invention relates to a novel cephalosporin compound, and pharmaceutically acceptable non-toxic salt, physiologically hydrolysable ester, hydrate, solvate or isomer thereof, to a pharmaceutical composition comprising the compound, and to a process for preparing the compound.

Abstract: A bidding method including: (a) generating a first bidding function value using an initial bidding price of a first bidder; (b) transmitting the first bidding function value to a successful bidding decider; (c) transmitting a second bidding function value of a second bidder to the first bidder; (d) transmitting a final bidding price of the first bidder and a final bidding price of the second bidder to the successful bidding decider; (e) determining a successful bidding price by comparing the final bidding price of the first bidder and the final bidding price of the second bidder; and (f) verifying whether or not the successful bidding price was manipulated

Abstract: A method and apparatus are provided for simply and securely limiting a number of times that contents can be accessed using a hash chain. The apparatus limiting a number of times contents are accessed by a user terminal includes a hash chain generator receiving information indicating selected contents by the user terminal and information indicating how many times (n) the user terminal has authority to access the selected contents and generating a hash chain including n hash values derived from a seed value, and a contents access manager deleting the hash values one by one from the hash chain whenever the user terminal accesses the selected contents such that the number of times the contents can be accessed by the user terminal is decreased by the number of deleted hash values.

Abstract: A scrambling apparatus and method are provided for increasing randomness without damaging compression efficiency of total video data by selectively and randomly performing conversion when converting motion vector codes of compressed video data into other motion vector codes indicating other motion vector values, and more particularly, by performing conditional conversion only if a predetermined condition is satisfied when selective conversion of motion vector codes is performed. The scrambling apparatus includes a conversion motion vector code table generator generating a conversion motion vector code table comprising motion vector codes obtained by converting motion vector codes corresponding to motion vector values of input video data in a standard motion vector code table; and a conversion controller randomly determining whether a certain motion vector value is encoded using the conversion motion vector code table or the standard motion vector code table.

Abstract: A home network system allowing a user to directly control joining or removing of member devices in a domain using a user interface and to effectively control a status change of the member devices of the domain and a management method therefor. The home network system includes: a master device, which forms a domain with more than one controlled device, transmits a predetermined domain key to the controlled devices included in the domain, generates a new domain key whenever a configuration of the domain is changed, and transmits the new domain key to the controlled devices remaining in the domain; and a control point, which provides a user interface allowing a user to directly change the configuration of the domain.

Abstract: A home domain building method and system that allow devices to join a home domain using smart cards. In the method, a master device reads device information from a smart card having a device ID and a device key as the device information of a guest device authenticated as a legal device and transmits a challenge request signal to the guest device, the guest device randomly generates a challenge value in response to the challenge request signal, the master device encrypts the challenge value using the device key of the guest device and transmits the encrypted challenge value to the guest device, the guest device decrypts the encrypted challenge value, and if the decrypted challenge value is the same as the challenge value generated in response to the challenge request signal, the guest device allows the master device to join the guest device in the home domain.

Abstract: Methods of authenticating a device using a certificate, and digital content processing devices for performing device authentication using the methods are disclosed.

Abstract: A method of creating a domain based on public key cryptography includes providing, by a content-providing server, a list of devices requesting content, and selecting, by a user, a device from the list; transmitting, by the server, discrimination information on revoked devices to the device; extracting, by the device having received the discrimination information, a secret value from the discrimination information, preparing a certificate using the extracted secret value, and transmitting device information and the certificate of the device to the server; verifying, by the server, the certificate and creating a domain ID and a domain key using the device information; encrypting, by the server, the domain ID and the domain key using a unique public key of the device and transmitting the encrypted domain ID and domain key to the device; and restoring, by the device, the domain key using a unique secret key of the device.

Abstract: Disclosed is a domain authentication method for exchanging content between devices. The domain authentication method for exchanging content between devices according to the present invention includes a first step of setting domain identification information into a predetermined device connected on a wired/wireless network; a second step of generating a domain secret key using the set domain identification information and predetermined device identification information; a third step of generating a predetermined first code value and transmitting a first packet encrypted with the first code value using the domain secret key generated in the second step; a fourth step of receiving a second packet that is encrypted with the first code value and a second code value; and a fifth step of decrypting the second packet received in the fourth step.

Abstract: A method of establishing a home domain capable of reproducing multimedia content, and a smart card therefor. The method includes creating a domain certificate for a reproducing device by inserting the smart card into the reproducing device, creating a session key by inserting the smart card into a home server, and verifying the domain certificate of the reproducing device and transmitting the created session key to the reproducing device if the device is a legitimate device. Alternatively, the method includes using an external certificate authority to determine whether the reproducing device is a legitimate device.

Abstract: A system for authenticating a content user, comprising a group common key that authenticates a user, a private key owned by the user, a trusted organization adapted to create and distribute the group common key, and to store personal information on the authenticated user and a temporary registration certificate issued to the authenticated user. A user apparatus converts the temporary registration certificate by means of a predetermined conversion method using the private key, and further provides the converted temporary registration certificate to a content provider prior to executing content provided by the content provider the content provider adapted to check whether the user has been authenticated by the trusted organization, using the group common key prior to providing the content.

Abstract: The present invention relates to a novel cephalosporin compound in which thiomethylthio chain is introduced into C-3 position of cephem ring and pharmaceutically acceptable non-toxic salt, physiologically hydrolysable ester, hydrate, solvate or isomer thereof. The present invention also relates to a pharmaceutical composition containing the compound and to a process for preparing the compound.