A simplified explanation is that decryption keys are delivered when a device with access is playing DRM protected media in order to make it viewable. You can then intercept this with various tools, take those keys and use them to decrypt such media by essentially acting as that device. A “WEB-DL” is when something has been successfully downloaded and decrypted using the right set of keys.
Because the stream is encrypted.
Of course provider might vary but i am speaking worst case like the N brand steaming service.
A simplified explanation is that decryption keys are delivered when a device with access is playing DRM protected media in order to make it viewable. You can then intercept this with various tools, take those keys and use them to decrypt such media by essentially acting as that device. A “WEB-DL” is when something has been successfully downloaded and decrypted using the right set of keys.
Id have to research this to truly understand it but thank you for sharing your knowledge.