One way to solve that is by using an SCP executable (there's one specifically for Inferno, check the SCP forum and you should find it somewhere)), as those don't have CD checks. Don't know if there's any no-cd patch out for the retail game though, never needed one since I bought it as soon as I saw it in the shops all those years ago.
Of course, another way would be to buy it; There are some shops that still have it... well ok, there's
one shop that still has it, and FS1 too even. Around here at least, but I'm sure there are some outside of my little corner of the world as well.
Finally, you could download the ISOs and burn them, but I'm kinda against that myself. The game's good enough imo to warrant a purchase if one wants the original. Not that I'm against downloading old and abandoned games as such, I just think this particular game is still worth the cost if you really want it

Plus, the box art is cool.