Well, if anyone owns the copyright, its probably Bayou Internet - http://www.bayou.com/
According to Wikipedia, Softdisk switched to being an ISP in '95, abandoning the software part of their business. They ran downloadstore.com which is now owned and run by Flat Rock Software, that used to resell only Softdisk's Screen Saver Studio. (I checked. The site is now full of broken links, and the search function doesn't work.)
Bayou Internet took over their ISP operations in '06.
So who's to say who owns the copyright? I doubt Bayou Internet, if they have the rights, would care much.