The Supreme Court ruled on Tuesday that U.S. companies that make and sell products abroad cannot prevent those items from being resold in the U.S.
For example if a textbook that is sold for $100 in the U.S. is sold in Brazil for $20 this ruling makes it legal for someone that purchases the $20 book to bring it to the U.S. to sell.
In Win for Libraries Over Publishers
In Win for Libraries Over Publishers, Supreme Court Upholds Reselling of Foreign Books
http://chronicle.com/article/In-Win-for-Libraries-Over/137999/