A digital watermark places a unique bit of code into a sound or image file to make the file difficult to copy or play without permission from copyright holders.

A digital watermark places a unique bit of code into a sound or image file to make the file difficult to copy or play without permission from copyright holders.

Digimarc and GS1 are advancing digital watermarking for product packaging as a replacement for UPC bar codes, saying it can speed up supply chains and retail transactions.