Abstract: 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.

Abstract: A method and apparatus for generating and updating a license for content and for providing content are provided. The method of generating a license includes generating license signature information for authenticating the license; generating use rule information for controlling the use of the content; generating authentication code information for authenticating a coupon for changing at least a portion of the use rule information; and generating key information required for decrypting the content.

Abstract: Provided is a method of preventing digital content from being used despite the presence of copy control information. In the method, a security apparatus capable of restricting use of contents generates a nonce with respect to a storage device and stores the nonce in the storage device and a memory separated from the storage device when content is stored in the storage device; updates the nonces stored in the memory and storage device when movement of the content occurs; and permits use of the content only when the nonce of the storage device, which is stored in the memory, is equal to the nonce stored in the storage device if the content is requested for use, thereby preventing a disk cloning attack.

Abstract: In an organic light emitting display apparatus and a method of manufacturing the same, the organic light emitting display apparatus comprises: a first substrate, one surface of which is divided into a non-display area and a display area including an organic light emitting diode (OLED); a second substrate, one surface of which faces the one surface of the first substrate; and a bonding member disposed between the first and second substrates so as to surround the display area of the first substrate, and bonding the first and second substrates to each other to define an inner portion including the display area and an outer portion including the non-display area. A bonding portion formed by the bonding member includes an effective bonding portion and a non-effective bonding portion.

Abstract: A method of managing and restoring an identifier of a storage device and an apparatus therefor are provided. The method includes the operations of generating a storage device identifier; recording the storage device identifier in a non-volatile memory of a host; generating an identifier file including the storage device identifier and a host identifier; and recording the identifier file in the storage device. By doing so, the method and apparatus can efficiently and securely manage the storage device.

Abstract: A method and apparatus for encoding data, and a method and apparatus for decoding data. The method of encoding data including generating first encoded data by encoding input data, dividing the first encoded data into a plurality of segments, and generating second encoded data by combining the plurality of segments and dummy data.

Abstract: A method of manufacturing an organic light emitting diode (OLED) display device including a first substrate having a pixel region, and a second substrate attached to the first substrate, to seal the pixel region, the method including: applying a frit to a region of the second substrate; applying a laser beam to the frit, to plasticize the frit; aligning the first substrate and the second substrate; and applying a laser beam to the frit, to attach the first and second substrates.

Abstract: A moving image watermarking method, which forms a global masking map by combining frequency masking, spatial masking and motion masking values together and inserts a watermark according to the formed global masking map through the use of a human visual system is provided. In the moving image watermarking method, a watermark value is obtained by exclusive-ORing a random key value and a binary value of a logo image. A plurality of masking operations are separately performed. A global masking value is obtained through the separate masking operations. A watermarked frame value is obtained by adding a watermark value weighted by the global masking value and a control variable to an original frame value.

Abstract: Provided are a method of issuing a DRM (digital rights management) key by using a CE (consumer electronics) device management server. The method includes: authenticating the CE device; if authentication of the CE device succeeds, transmitting a request for issuing the DRM key to a key server for storing and managing the DRM key; receiving the DRM key from the key server; and transmitting the DRM key to the CE device. Thus, the CE device can conveniently and safely receive the DRM key.

Abstract: A method and apparatus for generating a content identifier and preventing alteration of the content identifier are provided. The method includes generating at least one random number, generating location information for designating a plurality of locations within a content by using the at least one generated random number, extracting a plurality of parts of the content, which correspond to the generated location information, from the content, generating a integrity verification value based on the extracted parts of the content, which correspond to the generated location information, and generating the content identifier having the integrity verification value and the at least one generated random number.

Abstract: Disclosed are a method and apparatus for storing digital content in a storage device. A content key, which is a key used by a host for encrypting content when the content is stored to a storage device connected to the host, is encrypted by using a storage key of the storage device. The encrypted content key and encrypted content are stored in the storage device, and the host only stores storage keys. Thus, quantity of information maintained by the host can be reduced. Also, when a storage key is stored in a portable security component (PSC), portability and mobility of content bound to a single host may be improved.

Abstract: A method of managing and restoring an identifier of a storage device and an apparatus therefor are provided. The method includes the operations of generating a storage device identifier; recording the storage device identifier in a non-volatile memory of a host; generating an identifier file including the storage device identifier and a host identifier; and recording the identifier file in the storage device. By doing so, the method and apparatus can efficiently and securely manage the storage device.

Abstract: A method and apparatus for managing a client revocation list are provided. The method includes receiving a first client revocation list from a server; and selectively discontinuing an operation of a client, based on the first client revocation list. By doing so, the method and the apparatus can securely control contents.

Abstract: Provided is a method of preventing digital content from being used despite the presence of copy control information. In the method, a security apparatus capable of restricting use of contents generates a nonce with respect to a storage device and stores the nonce in the storage device and a memory separated from the storage device when content is stored in the storage device; updates the nonces stored in the memory and storage device when movement of the content occurs; and permits use of the content only when the nonce of the storage device, which is stored in the memory, is equal to the nonce stored in the storage device if the content is requested for use, thereby preventing a disk cloning attack.

Abstract: Provided are a method and apparatus for mutually authenticating devices in a group and reproducing content using public broadcast encryption. The method of authenticating a first device and a second device includes acquiring specific information of the second device from the second device, transmitting data, containing the acquired specific information of the second device and specific information of the first device, by encrypting the data using a broadcast public key of a group to which the second device belongs, and determining whether authentication of the first device succeeds by decrypting the encrypted data by using a private key of the second device. If authentication succeeds, receiving the specific information of the first device, which is encrypted by using a temporary common key by using the decrypted data, and authenticating the second device by decrypting the encrypted specific information of the first device by using the temporary common key.

Abstract: 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.

Abstract: 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.

Abstract: Provided are a method of generating a firmware update file which restrictively allows a firmware update for a corresponding hardware model, and a method and apparatus for updating firmware using the firmware update file. By generating a data body including program codes of firmware to be updated, generating a data header including model codes of a hardware device to which the data body is applied, and generating the firmware update file by combining the data body and the data header, the firmware update may be restricted for a corresponding model of a hardware device by using the firmware update file so that firmware of other models of hardware devices may not be updated, an integrity check may be performed using a digital signature when the firmware is updated.

Abstract: Provided are a method and apparatus for controlling transmission of content data. In the method, a communication channel is initially established to transmit the content data, the content data is transmitted through the established communication channel, verification is performed a plurality of times to determine whether the content data is transmitted within an acceptable transmission range, and whether to continue the transmission of the content data is determined according to the verification result. Accordingly, when a client moves to a location outside a predetermined acceptable transmission range in a wireless environment, a server stops transmission of the content data. In addition, content data can be continuously transmitted regardless of interference caused by a temporary obstacle between a server and a client.

Abstract: Provided is a method of limiting updating of firmware by distinguishing between model code that represents a group of hardware having firmware program codes are compatible with each other and model code that identifies each hardware belonging to the group. The method includes generating a data body having firmware program code that is to be updated; generating a data header having model code of hardware to which the data body is to be applied, wherein the hardware model code comprises first model code representing a group of hardware having firmware program codes are compatible with each other and second model code identifying each hardware belonging to the group; and generating a firmware update file by combining the data body and the data header.