"CORE Java Foundation Classes" by Kim Topley published by Prentice Hall. Chapt. 13, pg 1037.
"Note that, primarily for licensing reasons, there are restrictions that prevent some look-and-feel implementations being used outside of their native platforms. This means that, for example, the Windows look-and-feel cannot be used on the Solaris or Macintosh platforms."
I have also seen references to this on the Java Developer Connection. (
http://developer.java.sun.com) Register to this area for free.