This article describes a project for creating a community security structure spread worldwide that uses individually maintained home computers connected to the Internet. The basic concept of the project is that every individual person watches in and around his or her house using cheap cameras as his or her eyes, personal computer as his or her brain, and Internet as his or her communication means by his or her own expense. The purpose of the project is to re-create, in the present day, a mutual watch system, which widely existed in old Japanese communities, as well as in other countries in the world, but in a much more powerful and flexible form with the aid of the information technology. In the first stage of the project, a preliminary system with the minimum necessary functions for realizing the concept has been developed, which consisted of free software and operation manuals.
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