always wondered whether such a thing would work but, here it goes

Whenever a legitimate copy is entered into the drive, the executable file will work as normal for any amount of usage. asking for a key which is connected to that executable file (so keygens won't work)

BUT if the files on the disk are copied, or added to the clipboard. then it immediately releases a program which bluescreens windows (and wreaks havoc in Linux and Mac) causing the data in the clipboard to be taken down.

and the main game folder can be copied but will not work without the registry entries which will have a unique binary code for each install meaning that if on startup, the discrete database (a highly encrypted code in the engine of the game) check finds more than one PC using the same binary code then the game will shut down and not load.

then, the legitimate customer will not be punished for buying the game and can use the disk as many times as possible for reinstalls and no internet connection is required for install as all the codes are in the registry (but are updated discretely every time the internet is connected). and the right person will be punished for trying to copy the disk.

but creating such a thing would be one hell of a job, and it would have to go through numerous testing stages to ensure complete stability.

but, the idea is there, and you never know, the concept may work