If one watermark is good, are more better?

Fred Mintzer, Gordon W. Braudaway. If one watermark is good, are more better?. In Proceedings of the 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '99, Phoenix, Arizona, USA, March 15-19, 1999. pages 2067-2069, IEEE Computer Society, 1999. [doi]

@inproceedings{MintzerB99,
  title = {If one watermark is good, are more better?},
  author = {Fred Mintzer and Gordon W. Braudaway},
  year = {1999},
  doi = {10.1109/ICASSP.1999.758338},
  url = {http://doi.ieeecomputersociety.org/10.1109/ICASSP.1999.758338},
  researchr = {https://researchr.org/publication/MintzerB99},
  cites = {0},
  citedby = {0},
  pages = {2067-2069},
  booktitle = {Proceedings of the 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '99, Phoenix, Arizona, USA, March 15-19, 1999},
  publisher = {IEEE Computer Society},
  isbn = {0-7803-5041-3},
}