Note:
End users filling a form that contains a QR Code or DataMatrix barcode require Acrobat 7.0.5 or later, or Adobe Reader 7.0.5 or later. Decoding of QR Code and DataMatrix barcodes is supported by Adobe LiveCycle Barcoded Forms 7.0 but is not supported by Adobe LiveCycle Barcoded Forms 7.0 Standalone (ST).
See also 

To specify the symbology for the paper forms barcode