Yes; if you read the introduction to the version of the "Lions Book" which was republished in the 1990s with the 6th Edition UNIX source code, you can see that

Yes; if you read the introduction to the version of the "Lions Book" which was republished in the 1990s with the 6th Edition UNIX source code, you can see that the only reason it happened was that the executives in charge of the company who owned the UNIX copyrights/trademarks at the time (SCO before they went evil) were enthusiastic about the project and pushed it through the legal department, and that similarly Dennis Ritchie had acted as the internal champion within AT&T to get the OK from their lawyers.