OpenDDR is an open source, community driven project. I would think twice about attacking it. It /will/ make you look bad. The OSS community isn’t exactly fans of DMCA takedown notices.
There might be a business idea and a even commercial company behind OpenDDR – but since they seem committed to keeping their product OPEN they get my vote.
I think it will be impossible for Scentia Mobile to try to kill off any open source effort to provide a DDR API. There is a OSS alternative for everything today and DDR APIs is no exception. Even if SM kill OpenDDR a new project will surface soon.