How a dispute on royalties gave birth to the PNG file format

At the end of 1994, the controversy was preparing on the royalties imposed on GIFs due to the Lempel – ZIV – Welch (LZW) data compression technique used to underlie this image format.

Unisys, which had patented the technique a few years ago, insisted that the royalties were imposed, which sparked a fierce reaction among the developers.

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