Abstract: A broadcast transmission system according to an aspect of the present invention includes a broadcast network controller and a broadcast network switch, thereby transmitting an Internet protocol (IP) stream for a service that cannot be transmitted through one physical layer pipe (PLP) by distributing the IP stream into a combination of one or more PLPs. In this case, the combined PLPs may be in one or more broadcast network frequency bands. The broadcast network controller determines the combination of PLPs, and the broadcast network switch distributes the IP stream into one or more PLPs according to a control command of the broadcast network controller.

Abstract: A broadcast transmission system according to an aspect of the present invention includes a broadcast network controller and a broadcast network switch, thereby transmitting an Internet protocol (IP) stream for a service that cannot be transmitted through one physical layer pipe (PLP) by distributing the IP stream into a combination of one or more PLPs. In this case, the combined PLPs may be in one or more broadcast network frequency bands. The broadcast network controller determines the combination of PLPs, and the broadcast network switch distributes the IP stream into one or more PLPs according to a control command of the broadcast network controller.

Abstract: Provided is a content caching broadcast transmission system that receives content from a content server, converts the content, and transmits the content through a non-real-time broadcast protocol. A receiver receives broadcast content through the non-real-time broadcast protocol, converts the broadcast content into web content, stores the web content, and forwards the web content to a client terminal in a unicast manner. The web content may be an Internet application package including a plurality of web documents and a series of scripts necessary for playback. A web object included in the Internet application package may be parsed, and addresses of links included in the web object may be converted such that the addresses are accessible in a receiver and then may be transmitted.

Abstract: Provided is a system for targeted advertising including a broadcast transmission system, an advertisement service system, and a broadcast receiving device. The broadcast transmission system acquires information indicating whether target advertisement is performable by replacing the existing broadcasting advertisement from the advertisement service system and transmits broadcast signaling including a target advertisement chance information event through a broadcast network. The broadcast receiving device, upon receiving the target advertisement chance information event, acquires metadata regarding a target advertisement and target advertisement content from the advertisement service system and reproduces the target advertisement content by replacing the existing advertisement in a targeted advertisement section.

Abstract: A broadcast scrambling system with low latency may transmit an encrypted broadcast file with low latency through a method performed by the broadcast scrambling system, the method including determining an encryption application policy before a broadcast file is input through an input interface; pre-modifying information included in a header box of the broadcast file to be changed when media data is encrypted according to the encryption application policy and immediately transmitting the header box to which an encryption application parameter is added; and encrypting the media data on an encryption block unit basis and immediately transmitting the encrypted media data on a block unit basis.

Abstract: A terminal for reproducing a digital content in support of transmitting/receiving the digital content to/from another terminal based on whether a terminal is registered in a domain and whether a terminal belongs to a person use scope such that the terminal belonging to the person use scope is not registered in the domain.