I've switched the PKGBUILD to a VCS source and removed any source code modifications [0]. It should now be compliant with the license and the wishes of the upstream maintainer.
[0] https://aur.archlinux.org/cgit/aur.git/commit/PKGBUILD?h=noisetorch&id=ac816bf38000eea79291f41e6ffafe336dd95be7 -- hashworks Web https://hashworks.net Public Key 0x4FE7F4FEAC8EBE67
pgpM1zoaZTheu.pgp
Description: OpenPGP digital signature
