No matter what they say, you are protected under Fair Use as long as you are both located in the USA, and it is for criticism, comment, news reporting, teaching, scholarship, and/or research you should be fine.
Also, your case can get stronger or weaker (Quoting the US Patent Office on this)
The purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes
The nature of the copyrighted work
The amount and substantiality of the portion used in
relation to the copyrighted work as a whole
The effect of the use upon the potential market for,
or value of, the copyrighted work
Doesn't our patent office make perfect sense. But in other words if you don't steal their money with it (and your not, your even giving them good link karma), you are in an even better position.
While you loose a bit on number 3, the amount copied, you should definitely still be fine.
Good luck and if they try to sue you you can always move to Panama :)
The US Patent Office's website on this is http://www.copyright.gov/fls/fl102.html