See https://github.com/bitcoin/bips/commits/master/bip-0340 for a list of contributors. I have obtained permission to do this change from all contributors in private. Nevertheless, it would be good to get an ACK from every contributor in order to have publicly available evidence.
I haven’t contacted @Sajjon and @satsie, whose contributions constitute of fixing not more than two typos and are thus below the threshold of originality required for copyright to be applicable.