@thibaultmol do you have a link to documentation for that?
@michael @nixCraft @fluidlogic
I'll be honest, not sure. The blogpost itself doesn't say anything. the video just said "pdf 2.0, eID easy PDF signing (QES)"
I did find this: https://www.eideasy.com/blog/nextcloud-and-eid-easy-partner-up (old post though)
and https://www.collaboraonline.com/blog/sign-pdfs-from-collabora-online-secure-your-documents-now/ (nextcloud office is based on collabora office)
The blogpost about it (again, old) https://nextcloud.com/blog/nextcloud-hub-22-introduces-approval-workflows-integrated-knowledge-management-and-decentralized-group-administration/#:~:text=%F0%9F%93%9D%20documents%20signing
SSO is a Pro Feature -> red flag, ditched.
Check your local jurisdiction for the legality of an electronic document signature.