OK, update; I ran the "python --version' thing and it reported python 2.5.2. I copied the script and my book into the same directory, and I get an error message effectively (sorry, can't remember the exact words) saying the mobidedrm.py is not recognised.
So, the identical file works under windows through an emulator/virtual machine, but not under OSX. Weird, but I have something that works so I'm not too fussed.
Thanks for all the help.
Cheers, Peter
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