[bhaak]

> Some /really/ old titles are actually out of copyright (or the publisher has gone under and the license has been lost), but they're still sold through some services cause that's how public domain works.

Nobody has been dead long enough for any computer game to enter public domain by the lawful way of inaction.

There are some games that have been made available by the license holder. Like "Beneath a Steel Sky" which was released as freeware.