A content sharing system is disclosed that can efficiently execute copyright management for limiting illegal utilization of content, and can promote the degree of freedom in utilization of content within a legal range of private utilization. In the content sharing system, a content processing apparatus on the content providing side includes a source ID addition section for adding, to the content data, a source ID for specifying a providing source of content data. Meanwhile, another content processing apparatus on the content acquiring side includes a content rendering section having a rendering permission ID list including source IDs, added to content data whose rendering is permitted, for limiting, based on the source ID added to the acquired content data and the rendering permission ID list, rendering of acquired content data rendering. The content sharing system further includes a list management section for permitting updating of the rendering permission ID list.