GPLv2 is correct.
I use Ubuntu linux. And it would be great, if you can build it in Docker.
rpmlint reports E: incorrect-fsf-address /usr/share/doc/mp4tools/COPYING
fixed in git. Thanks for the report.
Issue with MP4 Joiner setup file for Windows
Fixed. Thanks for the repot!
Actually more than 99 titles are supported, if you use multiple titlesets. But you cannot jump to title with number greater than 99 from vmMenu. You need to use titleset menu instead.