Attempt to use the studied birthmark watermark to catch three colluders. Explain the encountered problems.

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To use the studied birthmark watermark to catch three colluders we can observe below encountered problems.

Watermarking techniques may be relevant in the following areas to catch colluders :

Applications convey ownership declaration: The primary use of watermarking is to assert organizational wishes for ownership of copyright for digital objects.
Problem :

These applications require a minimal amount of information which is to be embedded, coupled with for signal modification with a high degree of resistance .

2. Combined &Collective copy protection for applications:

To satisfy more complex copy protection requirements the serial copy management system (SCMS), which are enabled to make a single digital audio tape of a recording for a but prevented the recording for future copies

Problem:

The scheme was failed ultimately because not all manufacturers of equipment those were required to implement the scheme in their products.

3. Applications requiring data integrity checks andUsage control:

It is needed to have an assurance to the origin of a data object which can be demonstrated and its integrity ,can be maintained.

Problem:

WATERMARKING are invalidated by large changes.