@shtrom@piaille.fr Me being the conservative avoid-a-lawsuit type, I'd keep it GPL, but I'm not sure where the threshold is for "this is an independent implementation of the algorithm" and "this is a port of the C code to Rust". There are going to be similarities due to them implementing the same algorithm, but the fact that you had the C implementation to reference whilst writing the Rust code might tip the balance. I'd seek legal advice before choosing a Non-GPL license.