There are a couple of ways a video show can be YT sourced.
- If you use a download program to snatch the video directly from YouTube, the show would be YouTube sourced for obvious reasons.
- If you use a video you snatched from YouTube to create a DVD, DL-DVD, or Blu-Ray it will be a YouTube sourced show.
NOTE: If you acquired the raw file(s) directly from the filmer who just happens to have a YT channel where that show was posted you have the MASTER SOURCE. It is NOT YouTube sourced just because you got it directly from the dude who posted it on YT.