Dyslexic finger!!
Matthew. By what strange logic do you deduce that the copyright / ownership rights bought completely legally in a free market should not, when they die, go to a person's decendants or business partners?

Does the Honest Jon label still exist?
Have they publish any other similar material?
If not, why not?
Could it be that the material did not cover its production costs?
Lots of questions there for you and others to ponder.