Various Microsoft products provide read/write capability and/or other LZW capability covered by Unisys-owned U.S. patents 4,558,302, B1 4,558,302 and foreign counterpart patents. Although Microsoft is licensed under these patents, Microsoft’s license does not extend to software developers or third parties who use Microsoft toolkit, language, development or operating system products to provide GIF read/write and/or any other LZW capability in their own products ( e.g., by way of DLLs and APIs). Licensing information can be obtained by contacting Unisys at the following address: