Abstract: Disclosed herein is a key rotation scheme for a DRM system in a DASH-based media content service. A DASH encoder generates media decryption keys and provides a key list including the media decryption keys to a CP manager. Each media decryption key is identified by a key identifier (KID). The CP manager delivers the key list to a license server. The license server creates ECLs based on the key list, and delivers an ECL list including ECLs to the CP manager. Each ECL is identified by KID and includes an encrypted media decryption key and an encrypted KID. The CP manager generates a pssh box in which the ECL list is inserted into a data field, and delivers the pssh box to the DASH encoder. The DASH encoder delivers the pssh box to a client device, with the pssh box being included in a DASH MPD or media segment.

Abstract: Disclosed herein is a control word protection method for a conditional access system. There is provided a method for allowing a chipset of a receiver to securely obtain control words for descrambling scrambled content transmitted from a content delivery network.

Abstract: Disclosed herein is a key rotation scheme for a DRM system in a DASH-based media content service. A DASH encoder generates media decryption keys and provides a key list including the media decryption keys to a CP manager. Each media decryption key is identified by a key identifier (KID). The CP manager delivers the key list to a license server. The license server creates ECLs based on the key list, and delivers an ECL list including ECLs to the CP manager. Each ECL is identified by KID and includes an encrypted media decryption key and an encrypted KID. The CP manager generates a pssh box in which the ECL list is inserted into a data field, and delivers the pssh box to the DASH encoder. The DASH encoder delivers the pssh box to a client device, with the pssh box being included in a DASH MPD or media segment.

Abstract: Disclosed herein is a control word protection method for a conditional access system. There is provided a method for allowing a chipset of a receiver to securely obtain control words for descrambling scrambled content transmitted from a content delivery network.

Abstract: Disclosed herein are an apparatus for controlling copying of broadcast content and a method for recording and playing back broadcast content using the apparatus. The broadcast content copying control apparatus includes a communication unit for receiving a request for recording of broadcast content from a DRM client, and receiving content management information (CMI) corresponding to the broadcast content from a DMCD server, a security package configuration unit for configuring a DMCD security package using the CMI, a content management unit for recording the broadcast content based on recording permission information included in the CMI, and an encryption/decryption unit for encrypting the broadcast content, wherein the communication unit transmits recording result information to the DRM client, wherein the recording result information includes at least one of recording status information of the broadcast content, copy control information (CCI) corresponding to the broadcast content, and the CMI.

Abstract: A wireless charging system and a method of controlling permission for charging in the wireless charging system are provided herein. The wireless charging system includes a power transmitting unit and an authentication server. The power transmitting unit transmits a power receiving unit (PRU) control message to a power receiving unit, receives PRU dynamic parameter characteristics generated by the power receiving unit based on an authentication number input by the user of the power receiving unit, and wirelessly supplies charging power to the power receiving unit based on the input result of authentication. The authentication server authenticates the authentication number input by the user and included in the PRU dynamic parameter characteristics provided by the power transmitting unit, and transmits the result of the authentication to the power transmitting unit.

Abstract: Disclosed herein are an RCAS and a request processing method for the RCAS. The request processing method according to an embodiment includes validating, by a Distributed Authorization Center (DAC), a join request or a leave request transmitted from a Set-Top Box (STB), sending, by the DAC, a report message to a Centralized Authorization Center (CAC) when validation has succeeded, updating, by the CAC, a database (DB) related to a state of the STB, based on the report message, and sending a certificate state update message including information about the update to DACs of one or more additional head-ends.

Abstract: A Renewable Conditional Access System (RCAS) headend of an RCAS and a method of transmitting messages between a Distributed Authorization Center (DAC) and a Conditional Access Module (CAM) Authentication module Sub-System (CASS) included in the RCAS headend. The method of transmitting messages between a DAC and a CASS includes: transmitting, by a CASS, a subscription message for a subscription request to a DAC when receiving a subscription request from a Set-Top Box (STB); processing, by the DAC, the subscription of the STB based on the subscription message received from the CASS; and transmitting, by the DAC, a response message including security parameters to the CASS.

Abstract: A method, terminal and server for providing personalized food information for food safety are disclosed herein. The server includes a communication unit, and a processing unit. The communication unit receives a request for knowledge information related to the intake of a food of a user from a terminal and to send notification data to the terminal. The request includes the food identifier of the food and the personal information of the user. The processing unit generates the notification data, including the knowledge information, using food information, indicated by the food identifier, and the personal information.

Abstract: Disclosed are a method and apparatus for estimating symbol timing in a non-synchronized OFDM system. The present invention includes synchronizing a frame of a received signal, estimating the symbol timing of each symbol of the frame based on the synchronization, compensating for the symbol timing using a phase difference attributable to a Symbol Timing Offset (STO), variably changing within a Cyclic Prefix (CP) interval due to the frequency offset of a sampling clock and thermal noise, and performing channel equalization using a preamble based on output including corrected phase rotation.

Abstract: An apparatus for combining a broadcasting channel may include a channel detector to detect a vacant Radio Frequency (RF) broadcasting channel used by a photoelectric converter that converts a first broadcast program as an optical signal to a first RF signal, a broadcast receiving interface to receive at least one second broadcast program, a broadcast modulator to generate a second RF signal by modulating the second broadcast program using the vacant RF broadcasting channel, and a channel combiner to combine a broadcasting channel used for the first RF signal and the vacant RF broadcasting channel.

Abstract: A mutual authentication method in a Downloadable Conditional Access System (DCAS) is provided. The mutual authentication method may receive authentication-related information about authentication between an authentication unit and a security module (SM) from a Trusted Authority (TA), generate an authentication session key using the authentication-related information, transmit the authentication session key by the authentication unit to the SM through a Cable Modem Termination System (CMTS), and control a Conditional Access System (CAS) software to be downloaded to the SM from the authentication unit, when the authentication is completed by the authentication session key.

Abstract: Disclosed are a network protocol for contents protection in a digital cable broadcasting service and a conditional access system using the protocol. A method for renewing conditional access client software (CACS) by a conditional access module in a renewable conditional access system (RCAS) may include: receiving an RCAS announcement message from a headend; transmitting to the headend a key registration request message for requesting an authorization key when the RCAS announcement message is authenticated; receiving a key registration response message including the authorization key from the headend; and generating security factors based on the authorization key and renewing the CACS by using the security factors.

Abstract: A method for receiving contents using a mobile terminal according to the present invention is provided. The method includes generating a security channel connected to system being in charge of a service and content protection (SCP) client through an agent downloaded and installed in a mobile terminal; downloading and installing one or multiple SCP client software of different kind from the system through the security channel generated by the agent; and playing back the service or content provided in protected state by a content provider among the one or multiple SCP client software of different kind by driving the decodable SCP client software.

Abstract: An apparatus and method for fast load balancing bandwidth allocation based on a binary search may be provided, wherein the apparatus may include a bandwidth allocation request receiving unit to receive a bandwidth allocation request signal from at least one modem, and a bandwidth allocation processing unit to allocate a bandwidth to an upstream channel of the at least one modem, using a load balancing algorithm, in response to the received bandwidth allocation request signal.

Abstract: Disclosed are a method and apparatus for estimating symbol timing in a non-synchronized OFDM system. The present invention includes synchronizing a frame of a received signal, estimating the symbol timing of each symbol of the frame based on the synchronization, compensating for the symbol timing using a phase difference attributable to a Symbol Timing Offset (STO), variably changing within a Cyclic Prefix (CP) interval due to the frequency offset of a sampling clock and thermal noise, and performing channel equalization using a preamble based on output including corrected phase rotation.

Abstract: A method for installing different security clients for channels in a terminal in a conditional access system includes: searching one or more channels searchable in the terminal; requesting, for respective searched channels, security clients necessary for receiving pay programs to be transmitted through the searched channels, to a broadcasting station which takes charge of the searched channels; and downloading and installing, for respective searched channels, the requested security clients from the broadcasting station.

Abstract: There is provided a remote entitlement processing module integration processing device. The remote entitlement processing module integration processing device includes: a remote entitlement processing module generating and managing remote smart cards (RSCs) having the number corresponding to the number of host terminals managed by the remote entitlement processing module integration processing device; and a descrambler transferring channel selection information in response to a selection of a pay channel by a user to the remote entitlement processing module and descrambling a scrambled channel signal using a control word (CW) received as a response to the channel selection information, thereby making it possible to minimize dependency between a subscriber device and a conditional access system.

Abstract: The present invention relates to broadcast communication and, more particularly, to a method and apparatus for enabling a terminal capable of receiving mobile broadcast, such as DMB, to additionally receive a broadcast program provided by cable/IPTV/satellite broadcast. A broadcast receiver detects an idle band using a CR method, sends at least one of information about a broadcast channel and information about the idle band to a terminal, receives information that requests to provide a specific broadcast channel of one or more broadcast channels, included in information about a broadcast channel, from the terminal, receives the one or more broadcast channels from a broadcast station, selects the specific broadcast channel from the broadcast channels based on the information requesting to provide the specific broadcast channel, transfers the selected broadcast channel to a mobile broadcast delivery unit, and delivers mobile broadcast for the specific broadcast channel on the idle band.

Abstract: Disclosed is a mutual authentication method and apparatus in a CAS including a headend system and DCAS host. In particular, example embodiments relate to a mutual authentication method and apparatus in DCAS, wherein the mutual authentication is performed between an authentication server of the headend system and an SM of a DCAS host, and then CAS software is downloaded to the SM. According to the example embodiments, there is provided a mutual authentication protocol between the authentication server of the headend and the SM of the DCAS host in a cable network, and also provided a mutual authentication method and apparatus in the DCAS where a substantial authentication based on a hardware, such as a smart card or a cable card, is not needed.