Did the guy explicitly say in his video that he intended these to be “open source?” 'Cause otherwise, as far as I can tell, there’s nothing that actually gives anybody else permission to copy, modify, and redistribute. In other words, they’re proprietary “freeware,” at best.

The blueprint title block needs to have a field that explicitly names the license (Creative Commons or whatever), because otherwise it’s © Design Residential, Inc. All Rights Reserved, by default.