Installing Lion Legality



I purchased Lion from the App Store, installed it on my iMac. I believe that I can install it on
other Mac's owned by my family, free of charge, is this true?. I would like to install it on my
daughters MacBook, it has the necessary system 10.6.7. Do I log in to the App Store on her
Mac with my details in order to download and install.

Regards

John



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