My wife runs this game, I run a gaming ring with ISO images. Kids can mess up originals while playing sowe ISO all originals onto a server then allow playig off the images. This is a security protection issue from what I can understand. Being technical by nature I would advise using a utility called YASU along with daemon tools. We run most of our images like this and it allows Safedisc and Securom protection to run properly.

http://forum.daemon-tools.cc/f13/new-yasu-v1-07-released-15702/

  Remember this should only be done with games that you own and not PIRATED stuff. If you like the game then spend the money.