If the videos you seek are not commercially valuable and are instead educational, historical, or governmental, they might be in the public domain or under a Creative Commons license. Repositories like the are excellent resources for legally downloading and preserving video content for the long term. This is the only context where a truly free and permanent download link is ethical and legal.

: A tool by Xiaomi that supports downloading videos in multiple formats and resolutions.

Original files often have better quality than compressed streams.

: Contact the original uploader (if identifiable) and ask for a legitimate copy.