Dair's Window cover?

Emily Jackson, of Elite Minds, came up with this amazing image to use for Dair's Window...and I don't know how she did it but she got the essence of the story without having read any of it. Just one more reason to deal with professionals. I may ask her to design the book cover, once it's done.

If it ever does get done. I saved the opening chapter to a PDF to send to Emily, to help with future promotion...and I noticed I hadn't attributed the poem that Adam uses near the end of it, to its author. Nor did I have the title. So I went looking for it.

I was pretty sure it was written by Ranier Maria Rilke, but apparently not. It's thought of as being similar in style but not actually his. And now I'm worried I can't use it. His work is mostly in public domain, including translations from the French and German, because he wrote mainly around the beginning of the 20th Century.

But if this is a reimagining of his work in French, or an homage, that could still be under copyright and I'd need permission to use it. When I now have no idea who actually wrote it. Does anyone else?

Aucun ange 

Celui 

Qui s'est faufilé dans mon monde 

Au-delà de la peur de ceux 

Qui ne se soucient de rien. 

Aucune créature 

Celui 

Qui a l'habitude de se régaler 

D'un 

Sans armure 

Au-delà de sa connaissance 

C'est sa seule vérité. 

L'accepter 

C'est mentir à mon passé 

Sans besoin de correction 

Pour moi 

Le connaître 

C'est rejeter tout ce que j'ai 

De moi-même 

Afin de pouvoir reconstruire 

Un monde dont 

Je pourrais être plus qu'une partie. 

La terreur de tout ça 

Est exquise. 

Ma peur 

Me pousse 

À accepter 

La beauté qu'il offre. 

Pour que je puisse me reposer... 

Enfin... 

Enfin... 

Me reposer...

It's just, I really like the poem and feel it fits Adam's story, perfectly. I could offer a poor English translation, if you think that would help figure out the author...