This paper presents the discussions on intellectual property regarding digital interfaces, which were crucial for MOM/LOW (Living in Other Ways) to develop the system IDA (Digital interface for supporting housing production). It introduces IDA and its conceptual framework and differentiates intellectual property and authorship. Then, it examines the arguments for copyright, indicating them as myths or disguises of other intentions. This leads to examining some anti-copyright movements concluding that they follow the same logic of register. Thus, noncopyright (no license or register) seems to be the best means to protest against the current logic as also for conveying information.