Legality of using International Edition textbook in the U.S.
Section 602 of the USA Copyright Law is the section that deals directly with importing books. In this section, clause (a) states that, with a few exceptions, importing copies of a copyrighted work without the authorization of the copyright holder is a violation of their exclusive right to distribution as granted in Section 106(3). Exceptions include individuals importing a single copy of a copyrighted work for their own personal use, individuals carrying copies in their personal baggage who enter the US, and scholarly, educational, or religious organizations who bring in no more than five copies of a book for the purpose of not-for-profit lending or archiving.
However, subsection 602(b) adds an interesting twist to this. This subsection states that, if the copies are lawfully made (therefore, are authorized for manufacture in their country of origin by the copyright holder), then the US Customs Service does not have the authority to prevent the copies from being imported. The only thing that they are authorized to do, is provide a copyright registration service where copyright holders can pay a fee to be informed by the Customs Service whenever goods are imported that are not pirated goods, but are also not authorized for sale in the United States by the copyright holder.
What this rather complicated piece means is that a party outside the US, who is authorized by the copyright holder to distribute copies of a copyrighted work in another part of the world, does NOT have the right to make copies and ship them directly to the US for direct distribution to a customer or customers. That would be a clear violation of the license granted to them by the copyright holder, and therefore the copyright holder can take action under subsection 106(3). However, if a third party were to buy the copies outside of the US, take possession of them, then import them into the US for subsequent sale, that is allowed under Section 109.
This 'right' under Section 109 was tested all the way to the Supreme Court in the 1990's. In 1998, the Supreme Court overturned a 1996 decision by the Ninth Circuit, Federal Court of Appeals, that had ruled that the Section 109 right of the owner of a copy of a copyrighted work to sell or otherwise dispose of said copy, did not extend to lawfully made and lawfully obtained copies that are imported into the US for resale. This is referred to as parallel imports, or the "grey market", where works manufactured under the authorization of the copyright holder are subsequently imported without the express consent of the copyright holder for sale in the US. In their 1998 decision, the Supreme Court ruled that a direct interpretation of the copyright act does indeed provide the owner of a lawfully obtained copy of a copyrighted work, the right to sell or otherwise dispose of it as they desire, without violating the rights of the copyright holder.”
Source : http://answers.google.com/answers/threadview?id=295219
Chapter 6 of the USA Copyright Law : http://www.copyright.gov/title17/92chap6.html