It's never a good idea to deem somebody else's product "in the public domain", "abandonware", "free for redistribution" or any of the other excuses for thievery. For example, I was under the delusion that Robert Indiana's "Love" symbol was "in the public domain", until I learned that he is re-asserting his rights to the item with the help of the Artists Rights Society in New York (http://www.arsny.com/).