Thread:Gsimenas/@comment-5481445-20150218032329/@comment-6697950-20150218051755

It means that the video was taken down due to copyright. Honestly speaking, that happens quite frequently and we just don't have anyone who would be interested in keeping the videos up to date, nor have we found a source that wouldn't take the videos down in just a few days.

If you have found a still active video, feel free to use the new revision function to update the video.