This is part of a wider initiative to dust off old game serial keys and get them revived digitally by GOG, who hope to expand what they can turn into a DRM-free copy. You get all the goodies and updates.
So far over $104k worth of games have been reclaimed DRM-free on GOG. They are also reclaiming Mount & Blade and Eador in Russian-speaking lands if keys were handled by StarForce.
"We're doing our best to add more games. Stay tuned for future updates and announcements as soon as we know more." Visit GOG.com's Reclaim page to learn more.