Abstract: A cloud computing system is disclosed. The cloud computing system includes a management server that manages a plurality of servers and distributes service resources. Each of the servers corresponds to one of a secure server type and a general server type, and the secure server type of server decrypts an encrypted code provided from a client. Accordingly, a secure server can execute a code requiring security. Especially, by classifying a program code as a general code or a secret code, the general server can also perform the partial function of a program.

Abstract: Disclosed are a server and a client processing a security program by using a real-time distribution method and method of controlling the server and the client. A method of controlling a server processing a security program by using a real-time key distribution method according to an exemplary embodiment of the present invention includes: analyzing a security program for transmitting the security program to a client; decomposing a code of the analyzed security program into code blocks; encrypting the code blocks by using an encryption key; changing an original header of the security program to a first header; and transmitting a packed program including the encrypted code blocks and the changed first header to the client.

Abstract: Disclosed are a server and a client processing a security program by using a real-time distribution method and method of controlling the server and the client. A method of controlling a server processing a security program by using a real-time key distribution method according to an exemplary embodiment of the present invention includes: analyzing a security program for transmitting the security program to a client; decomposing a code of the analyzed security program into code blocks; encrypting the code blocks by using an encryption key; changing an original header of the security program to a first header; and transmitting a packed program including the encrypted code blocks and the changed first header to the client.

Abstract: Provided are a conditional access system and a method of using a conditional access image. The conditional access system according to an exemplary embodiment of the present invention includes: a service key management client allocated with a service key from a service key management server using a service key distribution protocol; a download client downloading a conditional access image using the service key and requesting updating the service key to the service key management server through the service key management client when the downloading is completed; and an execution controller encrypting and storing the conditional access image using the service key updated in accordance with the request and recovering the conditional access image using the service key reacquired through the service key management client before executing the stored conditional access image.

Abstract: Disclosed herein is a software-based conditional access image download client device. The software-based conditional access image download client device includes a download management module, a conditional access image splitter, and a conditional access image restoration unit. The download management module establishes a secure channel for communicating with a download server device over a network, and communicates with the download server device in compliance with a download protocol. The conditional access image splitter splits a conditional access image, received via the download management module, into a plurality of files, generates a plurality of encrypted files by encrypting the plurality of files, and stores the plurality of encrypted files. The conditional access image restoration unit restores the plurality of encrypted files to the conditional access image when the conditional access image is required.

Abstract: Disclosed is an apparatus for purchase and delivery of entitlement in an IPTV broadcast system according to an embodiment of the present invention that includes: an entitlement purchase environment provider providing a charged broadcast contents list to the purchaser so that the purchaser can select delivery target contents and providing an IPTV broadcasting service subscriber list to the purchaser so that the purchaser can select one or more entitlement delivery target subscribers to which the entitlement for the delivery target contents is delivered; an entitlement generator receiving information on the delivery target contents from the entitlement purchase environment provider, and then generating the entitlement for corresponding broadcast contents; and an entitlement transmitter delivering the entitlement for the delivery target contents to IPTV settop boxes of the entitlement delivery target subscribers on the basis of information on the entitlement delivery target subscribers.

Abstract: A settop box based on an IPTV according to an embodiment of the present invention includes: a home network interface communicating with one or more mobile terminals; a terminal profile manager acquiring and managing a terminal profile from a mobile terminal connected through the home network interface; a contents converter converting contents received from an external contents server through an external network to mobile contents suitable for the corresponding mobile terminal on the basis of the acquired terminal profile; a contents storage storing the contents converted by the contents converter; and a transmitting/receiving controller performing a processing operation to extract the mobile contents stored in the contents storage and transmit the extracted mobile contents to the mobile terminal through the home network interface in accordance with a request from a user.

Abstract: Provided are a receiver with a CA function based on software download, a CA system including the receiver, and a method for managing CA software executed by the receiver. The receiver includes a CA software management means, a download means, a demultiplexer, and a descrambler. The CA software management means performs an overall management operation including the download, execution, state control and termination of a plurality of CA softwares. The download means downloads the CA software from a CA software download server at the request of the CA software management means. The demultiplexer receives scrambled multimedia contents and a CA message and transfers the CA message to the CA software management means. The descrambler receives a descrambling key extracted from the CA message by means of the CA software and descrambles the scrambled multimedia contents with the descrambling key. Thus, a plurality of CA softwares can be operated in one receiver (e.g., a settop box).