[jpgvm]

Blizzard already has the source code, in fact it's actively being extended as part of a HD remaster right now.

I have no doubt they are very happy to have the original copy back, it probably means quite a lot of the original developers and I would never dream of keeping it from them had it been up to me.

I would definitely hope they keep the hard copy somewhere safe but history hasn't been kind to game source code.