What is required to use AirZip Accelerator to optimize GIF images?
In order to comply with the requirements of Unisys Corporation, the holder of US Patent 4,558,302, earlier versions of AirZip Accelerator disabled GIF LZW acceleration by default, and users were required to obtain permission from Unisys in order to use this feature. The U.S. LZW patent expired June 20, 2003, the counterpart Canadian patent expired July 7, 2004, the counterpart patents in the United Kingdom, France, Germany and Italy expired June 18, 2004 and the Japanese counterpart patents expired June 20, 2004. AirZip therefore no longer ships AirZip Accelerator with LZW acceleration disabled.
