Rip the base game + patches in a zip rather than the bare CD for preservation...
Right now the CDs are basically plastic waste inside more waste, sealed inside more waste.
The problem with that approach is that the authentic disc is effectively used as your licence at the moment. There wouldn't be any effective way to stop piracy with offline zip files
Mainly because only a tiny percentage of a tiny percentage (physical media buyers) of the user base would do that so it is not worth developing a solution for it.