A WEB-DL (Web Download) is a video file obtained by directly downloading a stream from a service like iTunes, Netflix, or Amazon, then stripping DRM. Key characteristics:

Streaming services have re-mastered or upscaled much of this content, but those masters are not sold on Blu-ray. Hence, .

Streaming services use DRM (Widevine, PlayReady) to block WEB-DL creation. However, cat-and-mouse game continues: