The Supreme Court has been examining the first sale doctrine in regard to Kirtsaeng v. John Wiley & Sons, Inc. The ruling is detailed here. Let's hope the first sale doctrine is always upheld, as it was this time. Your libraries' right to lend depends on it.
To learn more:
District Dispatch Article
Supreme Court of the United States Blog - Kirtsgeng v. John Wiley & Sons, Inc.
Or, watch this video for a summary of what the case is about: