Recently, some low-life tealeaf broke into our office (through the fire escape door) and stole a new iBook. My girlfriend who was alone in the office had just stepped out for 5 minutes to go to the toilet when it happened. I don't know whether to feel sorry for the thief who apparently was too cowardly to face a 4'10'' woman or be relieved that she was safe. Overall, I'm glad she was unhurt, and security and backup procedures have been tightened up. Anyway, to the point - we now have a new replacement ibook, and a spare set of OS X 10.4 DVDs lying around (from the stolen laptop) Is it legal to install this OS X 10.4 onto an old Powermac (formerly running 10.3)? I feel it is, as we paid in full (with charity /edu discount) for both laptops, and the theft has been reported to the police etc. My interpretion is that as well as paying for the hardware, we paid for a licence to use the software on a single Apple machine, irrespective of whether it was the original laptop or a different Apple computer. This is in the UK so UK law applies. Would be nice to have your opinions thanks.