This standard provides general guidelines in cases in which information, other than postal addresses and S10[3] 13-character identifiers, is printed on postal items, labels and forms in human-readable/OCR form which is intended to be captured by or used in computer systems.
UPU S45-2009 history
2009UPU S45-2009 OCR and Human Readable Representation of Data on Postal items, Labels and Forms