Time Base Modulation: a New Method of Watermarking Audio and Images

This page contains unmolested and watermarked data as described in the accompanying paper.

Below are sound and image files that have been very slightly altered to encode small amounts of information. Each sound file is 10 seconds long and they have been randomly ordered. Can you determine any differences between them? Click here to reveal which files were watermarked.

placeholder Mozart A placeholder
placeholder Mozart B placeholder

placeholder Beatles A placeholder
placeholder Beatles B placeholder
placeholder Beatles C placeholder

placeholder Raiders A placeholder
placeholder Raiders B placeholder

Reasons why this use of other people's music doesn't constitute copyright infringement.

I've used a similar technique to encode some information in the following picture. Can you tell which is modified and which is the original? Again, click here to reveal the original and the watermarked indications.

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