An interactive Web book ("ibook") system is provided that allows material to be contributed to the World Wide Web. An ibook is a self-extending, self-sustaining information-redistributing Web robot, which is resident on a data network such as the Internet or an intranet. Users may enroll with an ibook as viewers or contributors. Viewers may view ibook material, such as text or multimedia content. Contributors may contribute original material to the ibook or may create derivations of existing ibook material. Attribution information that identifies the source of material in a derivation is automatically generated. Information concerning the derivation of each work and its characteristics can be used to help the user navigate through ibook material. The ibook system keeps track of how often users access each work within an ibook. Contributors may be automatically rewarded (e.g., by a monetary distribution) based on the extent to which their contributed material is viewed by the users.