If YouTube says “video blocked” or won’t play, it’s usually due to copyright or regional restrictions (some videos aren’t allowed in certain countries), or sometimes the uploader has limited playback on other sites; on the technical side, I’ve also seen this happen because of browser extensions (ad blockers), VPNs, or corrupted cache. Try disabling extensions, clearing cache, or switching browsers, and if you’re using a VPN, turn it off and check again.