The source site has disappeared ("Fermeture du site - il ne contient plus aucun document/This website has been definitely closed."). At the Internet Archive, the image is still available at [1]. As to copyright, Pierre Lavaurs had written on his web site at [2]:

Français : Ce site n'est pas mon gagne-pain et je n'ai aucun usage des droits de propriété intellectuelle que je peux posséder sur celui-ci. En conséquence, vous êtes libres de faire l'usage que vous souhaitez du matériel y figurant, avec ou non indication de votre source selon votre fantaisie.

English: (Translation by Lupo): I don't make a living off this site, and I have no use for any intellectual property rights [copyrights, Lupo] that I might have on it. Therefore, you are free to use any materials on this site in any way you want, with or without attribution of the source, as you like.

This text was also included on the site in June 2005[3], and even in the first archived version of that page from 2003.[4]

The copyright holder of this work allows anyone to use it for any purpose including unrestricted redistribution, commercial use, and modification. Please check the source to verify that this is correct. In particular, note that publication on the Internet, like publication by any other means, does not in itself imply permission to redistribute. Files without valid permission should be tagged with {{subst:npd}}. Usage notes: If the work requires attribution, use {{Attribution}} instead. If this is your own work, please use {{Cc-zero}} instead. Copyrighted free use //commons.wikimedia.org/wiki/File:L%27Ortler.jpg