PARC Solutions: DataGlyphs

PARC DataGlyphs are a robust and unobtrusive method of embedding computer-readable data on surfaces such as paper, labels, plastic, glass, or metal. – [i]Variante interesante de la steganografía, con que se « esconden » datos en gráficas…[/i]

http://www.parc.com/solutions/dataglyphs/default.html