5. Intellectual Property Status

To the best of our knowledge, deterministic (EC)DSA is not covered by any active patent. The paper [BDLSY2011] points to two independent publications of the idea of derandomization by Barwood and Wigley, both in early 1997, and also to a patent application by Naccache, M'Raihi, and Levy-dit-Vehel a few months later [NML1997], but the application was withdrawn in 2003. We are not aware of any other patent on the subject.