I am not sure but I think that in some parts of the world DOS is considered an obsolete software - and if you do steal it (and I AM NOT telling you to do so), no legal actions would be taken against you. - no one puts an ad about it, becose it is still illegal to steal but they won't throw you in jail either...
Just smth. I heard... AGAIN - DO NOT STEAL - and I take no responsability for your actions