By demanding copyright assignment and then paywalling, they are directly reducing the social utility of this research work by drastically limiting its audience.

By demanding copyright assignment and then paywalling, they are directly reducing the social utility of this research work by drastically limiting its audience. They have even threatened web authors for merely linking to copies which belonged to the authors rather than themselves: http://realtimecollisiondetection.net/blog/?p=101 http://realtimecollisiondetection.net/blog/?p=101