Abstract
The copyright agreement system where author's copyrights are mutually respected was developed for promoting utilization of educational contents over the Internet. When original authors can resister their contents, they show various conditions depending on each creator's intent for reuse or modification of content at no charge or charged. Registered contents can be modified if authorized under the license term but modified contents must be registered to the system and prices are set by authors for the content. History of reuse and modification are shown by the system and original and modified authors can be approved their originalities each other. Metadata of contents are registered in the LOM (learning object metadata) and one can search by name of contents, metadata or condition of utilization.
