Developers certificate of origin
https://source.puri.sm/Librem5/librem5-policy/-/blob/master/source/software.rst?plain=1#L21-22
mentions:
The projects should use a Developer Certificate of Origin (DCO).
What does this mean in practice? Include a link to that in project READMEs? Usage of Signed-of
tags in commits?
Does/SHOULD this apply to all projects? If not, what kind of projects are exempt?