What I really like is the spin Unisys is putting on their behaviour:
But Unisys credited its exertion of the LZW patent with the creation of the PNG format, and whatever improvements the newer technology brought to bear.
"We haven't evaluated the new recommendation for PNG, and it remains to be seen whether the new version will have an effect on the use of GIF images," said Unisys representative Kristine Grow. "If so, the patent situation will have achieved its purpose, which is to advance technological innovation. So we applaud that."
Corporate sleaze at its best :-D