Activist Guide to Exploiting Media by George Mombiot

By George Mombiot

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The situation is different for light and popular music where the market life is shorter. E-commerce for music distribution is not acceptable for publishers without the support of adequate protection mechanisms. Publishers prefer to protect their music and at the same time to allow the users exploiting content functionalities according to the permissions and prices established by the publishers. To cope with these problems, mechanisms for protecting musical objects include: • Encryption techniques to support the transferring music objects; • Watermarking audio files in different formats; • Watermarking images of music score sheets; • Watermarking music sheets while they are printed from symbolic notation files; and • Definition of Digital Rights Management policies.

Embedding strength — There is a trade-off between watermark embedding robustness and quality. Increased robustness requires a massive embedding of hidden bits. This increases music score degradation and watermark visibility. Data Capacity A very important question is the information that should be stored during the watermarking process. This is limited by the number of music notation symbols that can be changed and how these symbols can be changed without degrading the readability. This is generally called the capacity of the information channel used for watermarking.

When the image is photocopied the thickness typically changes to an unpredictable amount due to the scaling effect of photocopying. The precision of estimation of line thickness corresponding to 1 and 0 is fundamental for the correct reading of the watermark. Therefore, the first step is to verify if the score music under elaboration is watermarked or not, and at the same time to estimate the thickness values associated with 1 and 0 bit values. To this end, the following estimations are performed.

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