Originally Posted by thomas
There is no such thing. Sites which offer games without permission from the authors are illegal. Your iso is an illegal pirate copy.
What you mean is, abandonware isn't legal, regardless of what the disclaimers propose. But abandonware is in reality just a term for old games that aren't sold in stores or produced anymore, hence they're "abandoned" by the developers/publishers.
In reality it's really just a different term for pirated software. If permission has been given by the copyright owners, it's become freeware. A game can never really "become" abandonware.