Well I just had an idea...
You can legaly make one backup copy for YOURSELF, right?
Well, why not take it to a friends house, use a CD copy program, note that this will NOT defeat the security on the disk, but will only copy the sectors of the disk containing the install files, so it will then let you be able to install it, using the backup, however....You should still need the CD to play it...Or if it is activated on steam you will have to log in each time.