Michael Weinberg writes on the Open Source Hardware Association blog:

Open Source Hardware Certification Logo is Official

We at OSHWA are excited to announce that the OSHWA Certification process has an officially registered trademark. This registration will make it easier for OSHWA to prevent people from using the OSHWA Open Source Hardware Certification logo if they have not actually gone through the certification process. We hope this will give the community more confidence when they see the OSHWA certification logo on hardware out in the world.