After reading many legal documents about French "author's rights" laws -not exactly the same as "copyright"- it appears that the 62 carols are free of rights since they've been already published while the author's rights of any unpublished material though centuries old belong to whatever individual or corporate body legally owning the physical original document. The rights only last 25 years after their 1st publication.

Then... I've slightly edited my first post, I'll edit the 11 carols lyrics I posted so far -only the 1st one is done- but I'll leave the lists with both classical and Mistralian spellings to make them easier to find through searching.