There are many old games that runs some kind DRM system that is using deprecated Operating System API's - some of them are undocumented and mostly operated in

There are many old games that runs some kind DRM system that is using deprecated Operating System API's - some of them are undocumented and mostly operated in ring 0. Just because you pirated a game that you own a copy, in order to play it on newer version of operating system does not make you criminal. You may need a court decision only if you are not able to private or fix it without the company help but that's all.