Uh, tech's not really a great reason. The tech behind 20 year old games is hardly an arcane mystery. The Games industry in general is pretty good at sharing tec

Uh, tech's not really a great reason. The tech behind 20 year old games is hardly an arcane mystery. The Games industry in general is pretty good at sharing techniques, perhaps because by the time they're shared, they're already old. You don't need a game to enter the public domain to deconstruct ideas and craftsmanship either. You DO need it to legally play the majority of games for free, or to resell without paying royalties.