摘要：A system has been developed to support copyright agreements between the original author, derivative author, and user in order to promote the use of electronic works for educational purposes that are provided over the Internet. The conditions for reuse and derivative use of educational electronic works that are registered on this system can be shown, as well as conditions not only for use free of charge but also conditions for paid use, including prices. The system also makes it obligatory to register electronic works that have been modified, and it can show the conditions for use of such derivative electronic works. Since the system shows a history of what modifications were made, it can identify the original author's work and the derivative author's work and can name the author and show author information. Registration on this system further causes that metadata to be attached to the work, which can therefore be searched by the electronic work title, by author information, by conditions of use, or other such terms.
关键词：Copyright;agreement on reuse and modification;educational electronic works;CreativeCommons
