Library or code to perform marker or watermark code correction

Does anyone know any libraries or freely available code to encode / decode marker or watermark codes? I don’t care about the language if it can work on a regular Linux box.

Any links to programs that can execute Watermark / Marker error correction codes will also be great. So far, all I can find are documents on this subject that do not release source code or provide demo programs.

In general, I am looking for codes to correct input / deletion errors.

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