Help with HOMM 4 - can't make working copy

[Marshall4]

I went into Windows XP and set my location to Australia. This allowed me to set CloneCD to "Hide CD-R media." Then I made the copy of the HOMM4 play disk, and lo and behold it works!

Then I tried the previous disk I made (before setting CloneCD to hide cd-r media) - and it works too!?! Why does setting the CloneCD switch let my copy work? I thought it had something to do with allowing it to copy it correctly. Does the copy protection see CloneCD and a CD-R and decide I have a copy and therefore won't let it work? But then I shouldn't have been able to play from the original! I don't understand, can someone explain this?