one entry up, (by removing the filename of the pdf), you have the gpx files for the eastern and western tracks. at the bottom of the page it is stated that the page is created with software under a "licence libre", and then a copyright 2025 mark. But there is no copyright info on the gpx files. Could we  be able to use those? https://www.viroinval.be/fr/loisirs/tourisme/office-du-tourisme/explorez/promenades-pedestres/randonnee-geologique-sentier-de-leau-noire-et-du-viroin/