Diablo III account sharing forbidden

My wife is showing some interest in Diablo III. Great, it is always nice when we play the same game. But then I realized that something has changed: We played Diablo I on one computer using a single copy of the game. I'm pretty sure that at least for the single-player game that was perfectly legal, with games generally having a single computer license, playable by the whole family. That isn't the case any more for Diablo III: You need a Battle.net account to play Diablo III, and sharing that acc

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