[ctmagnus]

.lit ebooks are tied to passport accounts so if Reader on the desktop and on the PPC are both activated with the same passport account there should be no issues. I'm not sure how to deactivate a copy of reader on a PPC as I've never had to do so, and I can't recall how to do so on the desktop atm as it's been quite a while since I've had to do so. But as long as both versions are up-to-date there should be no problems.

You can also go the un-DRMing route if you like but there may be legal implications depending on where you're located.