The lecture  gives an introduction (in English) into the area of watermark research with a focus on nowadays computer based technologies. It comprises of the following topics:

·        short history of paper production

·        what are watermarks and why  they are interesting

·        watermark research and researchers

·        watermark catalogues

·        watermark databases

·        recording methods for watermarks

·        classification of watermarks

·        search for watermarks, Bernstein project