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PDF417
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=== Error correction === When the PDF417 symbol is created, from 2 to 512 error detection and correction codewords are added. PDF417 uses [[Reed–Solomon error correction]]. When the symbol is scanned, the maximum number of corrections that can be made is equal to the number of codewords added<!--because damaged codewords are likely to result in erasures-->, but the standard recommends that two codewords be held back to ensure reliability of the corrected information.
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