Patent ID: 7299498

Claim:
A system for sharing digital literary works while protecting against an illegal reproduction through a communication network, comprising: a data communication network; a list providing server for providing list information of a Sharing Web; at least one agent server for forming the Sharing Web between users through the data communication network and mediating a data communication through the Sharing Web; at least one user terminal for transmitting and receiving a digital literary work through the Sharing Web; a main server for accessing a Sharing Web listed in the list information provided from the list providing server through the data communication network, searching for the digital literary work shared through the Sharing Web according to a predetermined search condition, determining whether or not the searched digital literary work has an identifier which is associated with at least one of a plurality of variably located portions of the digital literary work, deciding a digital literary work to be shared among the digital literary works, which are inputted by a supervisor and have a identifier, according to the determination result and literary work information requiring the protection, inputted by the supervisor, and generating accessing information of the Sharing Web, the decision regarding whether to share the digital literary work being based only on existence of the identifier in the digital literary work; at least one sub-server for receiving information of the digital literary work decided to be shared and the accessing information of the Sharing Web from the main server, connected to the agent server depending on the accessing information, and allowing a sharing of the digital literary work decided to be shared; a premise communication network for connecting the main server and the sub-server to each other; and a network interface unit for connecting the premise communication network to the data communication network, wherein a position of the identifier within the digital literary work is determined based on transmission rules between the main server and the at least one agent server.