Also, we don't have the details of the OEM agreement. I can't believe that there would be enough wiggle room in it to allow a company (in this case, Trumpf) to so blatantly steal the technology and market it as their own.
I don't agree that this definitively excludes the idea that Trumpf has integrated PR3D and is branding it as their own. They may be taking the stance that 'they' developed it in cooperation with SGLB via the OEM agreement. The 'Sigma Inside' model has been discussed for some time, but who said the machine maker would be required to put a sticker on it. There are many components inside the machines that are the product of other companies, but they don't get any credit on the marketing.