Don't worry about pre v4 browsers. Your target audience here is MS-based developers, who, because they're using VC++/VB/ASP are likely to have IE 5 or higher installed. By putting that "unlicensed software" bit there, Unisys can scare web site operators into using licensed GIF software. Because their licenses are royalty-based, a sale of a licensed GIF app means royalty $$ for Unisys. Also, this may drive these unlicensed apps out of circulation. Here's my Unisys story: I sell a program called ThumbNailer. It does image thumbnails (wow!). It can be run from DOS or windows and has the ability to do GIFs. I licensed GIF/TIFF-LZW from Unisys for a $2500 pre-paid royalty fee. My GIF license specifically applies to apps that do NOT run on a server. Apps that do run on servers are subject to a different (higher) royalty and fee rate. The server vs. non-server issue is tricky. Basically, my EULA says that the app can't be run on a live web or intranet server and the user has to agree to this EULA to complete the registration process. But, some people want to generate JPG or PNG thumbnails on a server. Because my ThumbNailer EULA would forbid this, I have to maintain a separate non-GIF/TIFF-LZW version of the app that people CAN use on a server. -