[Egghead]

If I understand U.S. law correctly, if you purchase a work in one format, you can convert it to any other format you'd like for your own personal use, right? So if I buy a Harry Potter book in dead tree format, I can read an electronic version on my computer while the paper book is sitting in my closet, correct? Here's my question, then: If I purchase the U.S. version in paper format, is it acceptable to have the British version on my computer - or must they be the exact same version? (Some of the informal speech actually needed to be translated between the cultures, as there are some major differences in colloquial meanings.)