Comment There's a bunch of 2D barcodes out there as well (Score 1) 126

by pierz on Friday February 16, 2007 @12:05PM (#18038904) Attached to: Camera Phones Read Hidden Messages in Print

Things like Shotcode and DataMatrix etc - see http://en.wikipedia.org/wiki/2D_barcode/. Then there's all the watermarking schemes...

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