Uncertainty of ownership is a problem with many old software. Recently I tried to buy a software upgrade for a piece of classic Mac software. After finding the current address of the company and asking for an upgrade, the business manager told me neither an upgrade nor any license for this product will be available any more. They do not even have a copy of the source or a master disk. And often enough you will not even find an address to ask for a license.
To copy and recirculate such software most likely will break law. It is a juristic problem with jurassic software, not a commercial one. Some clarification from a lawyer's point of view would be most welcome.