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Adding missing closing-note tag.
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</section1>
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<section1 topic='Background' anchor='background'>
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<section1 topic='Background' anchor='background'>
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<p>The "LZW" compression algorithm was originally developed by Abraham Lempel and Jacob Ziv, subsequently improved by Terry Welch <note>See "A Technique for High-Performance Data Compression", <cite>Computer</cite> (June 1984), pp. 8-19.</note>, and patented by Sperry Corporation (later Unisys Corporation) as U.S. Patent Number 4,464,650 <note>See <<link url='http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4,464,650'>http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4,464,650</link>>.</note>. This patent expired on June 20, 2003 <note>See <<link url='http://compression-links.info/Link/1264_LZW_Patent_Expiration.htm'>http://compression-links.info/Link/1264_LZW_Patent_Expiration.htm</link>> and <note>See <<link url='http://compression-links.info/Link/1814_LZW_Patent_Expiration.htm'>http://compression-links.info/Link/1814_LZW_Patent_Expiration.htm</link>>.</note>. Therefore implementations of LZW are no longer patent-encumbered.</p>
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<p>The "LZW" compression algorithm was originally developed by Abraham Lempel and Jacob Ziv, subsequently improved by Terry Welch <note>See "A Technique for High-Performance Data Compression", <cite>Computer</cite> (June 1984), pp. 8-19.</note>, and patented by Sperry Corporation (later Unisys Corporation) as U.S. Patent Number 4,464,650 <note>See <<link url='http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4,464,650'>http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4,464,650</link>>.</note>. This patent expired on June 20, 2003 <note>See <<link url='http://compression-links.info/Link/1264_LZW_Patent_Expiration.htm'>http://compression-links.info/Link/1264_LZW_Patent_Expiration.htm</link>></note> and <note>See <<link url='http://compression-links.info/Link/1814_LZW_Patent_Expiration.htm'>http://compression-links.info/Link/1814_LZW_Patent_Expiration.htm</link>>.</note>. Therefore implementations of LZW are no longer patent-encumbered.</p>
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<p>The algorithm is specified by Ecma International in &ecma151; under the name "DCLZ".</p>
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<p>The algorithm is specified by Ecma International in &ecma151; under the name "DCLZ".</p>
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</section1>
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</section1>
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