Microsoft KB Archive/193543

= INFO: Unisys GIF and LZW Technology License Information =

Article ID: 193543

Article Last Modified on 8/12/2005

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APPLIES TO


 * Microsoft Visual Studio 6.0 Enterprise Edition
 * Microsoft Visual Studio 97 Service Pack 3

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This article was previously published under Q193543



SUMMARY
This article provides information about licensing issues regarding the .gif file format and the Lempel Ziv Welch (LZW) data compression and decompression technology. Unisys has patented this technology and requires that anyone using this technology obtain a license. This article contains links where you can get more information about the required license.



MORE INFORMATION
The LZW data compression and decompression technology is covered by United States Patent No. 4,558,302, Japanese Patent Numbers 2,123,602 and 2,610,084, and patents in Canada, France, Germany, Italy, and the United Kingdom.

Microsoft has obtained a license from Unisys to use the .gif file format and other LZW technologies covered by the Unisys-owned U.S. and foreign patents in a number of Microsoft products.

However, this license does not extend to third-party developers using Microsoft development products to develop applications. Third-party developers must have a license from Unisys in the form of a written agreement.

If you would like to use, sell or distribute any hardware or software using or converting the .gif file format or LZW-based technologies, you must obtain a license from Unisys.

For more information about the licenses required to use this technology, contact Unisys. For information about how to contact Unisys, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

60782 Hardware and Software Third-Party Vendor Contact List, Q-Z

Keywords: kbinfo KB193543

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