License Review: Libpng and libpng-2.0
License Review Request
License name
Libpng
Text of license
http://www.libpng.org/pub/png/src/libpng-LICENSE.txt
Package name and link to source
libpng -- http://prdownloads.sourceforge.net/libpng/libpng-1.6.40.tar.gz?download
Is this license on the SPDX License List?
Both libpng licenses are already in SPDX, see https://spdx.org/licenses/Libpng.html and https://spdx.org/licenses/libpng-2.0.html
Reason for license review
I was looking at packaging https://github.com/kornelski/rust-libpng-sys which states its license as "Libpng", I assume in the intent of releasing this under the same license as the libpng project (as these are just rust bindings for it). This sent me down the rabbit hole of figuring out what license libpng actually uses. The Fedora package currently declares it as zlib (https://src.fedoraproject.org/rpms/libpng/blob/rawhide/f/libpng.spec#_8) but it's actually a somewhat custom license that's already in SPDX but not in the Fedora license list. What's not entirely clear to me is whether libpng (and thus this rust-libpng-sys project) should be "Libpng", "libpng-2.0", "libpng-2.0 AND Libpng" or some other variation thereof.