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Some TIFF image files use the Lempel-Ziv-Welch (LZW) compression technology, which is patented by Unisys Corporation. The patent expired in all countries on July 7, 2004, and TIFF/LZW read capability is now freely available to ArcView GIS 3x users.
After the avopt.dll file has been copied into the \arcview\bin32 directory, ArcView GIS will read LZW compressed images.