We have previously described the Progressive Barcode, a high-density color barcode that changes over time. In this paper we will describe how the progressive barcode works and its applicability to information workflows and archiving applications.
Steven Simske, Marie Vans, "Archive-enabling Tagging Using Progressive Barcodes" in Proc. IS&T Archiving 2015, 2015, pp 130 - 135, https://doi.org/10.2352/issn.2168-3204.2015.12.1.art00031