Sources
A route is added only when we can trace it back: original page, visible author, and clear usage terms. If the rights are unclear, it stays out of the collection.
Wikimedia Commons
The starting point for the first routes: each file has a page, history, author details and a free license.
YouTube Creative Commons
Used carefully and case by case: metadata is saved, the license is checked, and the creator is credited.
Archive and public media
We use these sources when the terms are clear and the original page can be shown next to the video.