YSK about Widevine, Google's DRM solution for streaming content. It's used by most top streaming platforms and dictates per-device which video resolutions you're allowed to stream at, regardless of what you pay for.
from /r/YouShouldKnow
YSK關於Widevine，谷歌的流媒體內容的DRM解決方案。它被大多數頂級流媒體平臺所使用，並決定了每個設備允許以何種視頻分辨率進行流媒體播放，而不管你支付的是什麼。