Amiga, Inc. and Hyperion use them as "documentation," but the copyrights on the published versions are owned by Addison Wesley--unless they were retained by Commodore and passed from company to company along the way.
It has "(c) 1991 by Commodore-Electronics, Ltd." printed on the inside of the 3rd editions I have right here.
I doubt very much that A.Inc or Hyperion have the rights to use them.