Samsung SPE-400 User Manual

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by M.I.T. but is also freely distributable. It appears thatthe arithmetic coding option of the JPEG spec is coveredby patents owned by IBM, AT&T, and Mitsubishi. Hencearithmetic coding cannot legally be used without obtainingone or more licenses. For this reason, support for arithmeticcoding has been removed from the free JPEG software.(Since arithmetic coding provides only a marginal gain overthe unpatented Huffman mode, it is unlikely that very manyimplementations will support it.) So far as we are aware,there are no patent restrictions on the remaining code. TheIJG distribution formerly included code to read and write GIFfiles. To avoid entanglement with the Unisys LZW patent,GIF reading support has been removed altogether, and theGIF writer has been simplified to produce “uncompressedGIFs”. This technique does not use the LZW algorithm; theresulting GIF files are larger than usual, but are readable byall standard GIF decoders. We are required to state that “TheGraphics Interchange Format(c) is the Copyright propertyof CompuServe Incorporated. GIF(sm) is a Service Markproperty of CompuServe Incorporated.”

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