The use of Cloudflare suggests an intent to mitigate takedown requests and DDoS attacks.
If a media player can't play your Xvid file, the player likely lacks the necessary codec. Using a codec verification tool can help check if Xvid is correctly installed on your system. The best solution is often to use a player like VLC that doesn't depend on your system's codecs.
The “verified” badge is a visual marker placed beside certain uploads. Publicly available statements claim that verification involves: