I don't think that "Eagle project files" are necessary to be open. Look at source files for RHEL, yes they're open, but not divided to patches, so you or any company(it was Oracle iirc) can't use their work to create competing distribution. Same is here, the project is open(to the end-user), but the company(GDC) must defend their work. And I'm pretty sure that, if you(Estel), so much need those project files, you can start negotiations with GDC, and get those under some sort of NDA, or something similar, if you're not planning to compete with GDC business.