A digital watermark for vector-based fonts

In this paper we present a blind watermarking scheme for vector-based fonts. The scheme can be used for authenticating the copyright holder as well as for identifying customers of fonts. We slightly modify the symmetry between curve pairs to embed a binary message. The watermark is invisible and robust against conversion into other vector-based font formats. An implementation for TrueType-Fonts was evaluated by typeface designers.Based on the blind watermarking scheme we discuss an extension to a non-blind watermark, which is in addition robust against uniform scaling.

[1]  Ioannis Pitas,et al.  Watermarking Polygonal Lines Using Fourier Descriptors , 2004, IEEE Computer Graphics and Applications.

[2]  Tobias Isenberg,et al.  Illustration watermarks for vector graphics , 2003, 11th Pacific Conference onComputer Graphics and Applications, 2003. Proceedings..

[3]  Hwan Kang,et al.  A vector watermarking using the generalized square mask , 2001, Proceedings International Conference on Information Technology: Coding and Computing.

[4]  Christoph Busch,et al.  Feature-based watermarking of 2D vector data , 2003, IS&T/SPIE Electronic Imaging.

[5]  Ryutarou Ohbuchi,et al.  Robust watermarking of vector digital maps , 2002, Proceedings. IEEE International Conference on Multimedia and Expo.

[6]  Christoph Busch,et al.  Reversible watermarking of 2D-vector data , 2004, MM&Sec '04.

[7]  Lawrence O'Gorman,et al.  Watermarking Document Images with Bounding Box Expansion , 1996, Information Hiding.

[8]  R. Morelos-Zaragoza.  The art of error correcting coding , 2002 .