yeah but the xpdf library part of xpdfviewer is open-source (gplv2) https://www.xpdfreader.com/download.html https://www.xpdfreader.com/download.html note tha

yeah but the xpdf library part of xpdfviewer is open-source (gplv2) https://www.xpdfreader.com/download.html https://www.xpdfreader.com/download.html note that the source code is not on github, but is just dumped each version as a tar https://www.xpdfreader.com/old-versions.html https://www.xpdfreader.com/old-versions.html I once needed to have it for some PDF experiments and I put it on github (this is the newest version; I did _not_ go old versions one by one; I just dumped 2 newest versions) https://github.com/karelbilek/xpdf-mirror https://github.com/karelbilek/xpdf-mirror