Barcode Online Reference
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Portable Data File 417 (PDF417) is a 2D bar code that supports full ASCII, binary, and numeric data, and can encode foreign language character sets.
A traditional bar code is really just a key to a record in an external database that contains the useful information. A PDF, however, contains the useful information in it; it really is a "Portable Data File." The advantage to this is that access to a database is not necessary.
PDF Error Correction
Error correction enables this bar code to make corrections for missing data due to a damaged or defaced label. Part of the label can actually be missing and the redundancy built into the PDF can still result in all the information encoded being readable. If the information cannot be read in its entirety, it provides no data at all.
The error correction values range from 0 (no error) to 8 (maximum correction); the greater the error correction value, the larger the bar code.
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