Abstract: A peer-to-peer (P2P) service providing system and method for preventing contents from being illegally distributed are disclosed. An electronic tag is assigned to digital contents after generating the contents. Information regarding the electronic tag is provided in response to a content request. A determination is made as to whether a fee to share corresponding contents has been paid using the electronic tag information, and the corresponding contents are provided. Illegal content distribution through the Internet (particularly, a P2P system) can be prevented.