Right where it says - in the distribution. I.e., download the Seam distribution here: http://www.seamframework.org/Download (whichever version you are interested in), unzip and voila! The file copyright.txt is right there in the unzipped folder.
Thx for the reply. I wished it was there in 2.0.2 GA distribution. However, I didn't find one. Any clue whereelse I can get one for 2.0.2 GA?