# Content protection

Also called: anti-piracy, DRM

> Measures that make paid course material harder to copy or redistribute: signed video links, watermarking, download blocking, device limits and, at the strict end, DRM.

Source: https://prolaud.com/glossary/content-protection

These measures differ in what they actually prevent. Signed, expiring links stop a URL being shared; device limits stop one login serving a class; a visible watermark carrying the viewer's name deters re-uploading because the leak identifies the leaker.

DRM proper (Widevine, FairPlay, PlayReady) encrypts the video and licenses playback per device. It is the strongest option and the most expensive, and it still cannot stop someone pointing a phone at a screen — which is why watermarking is the measure that scales.

## On Prolaud

Course video is served through signed links with downloads disabled and a viewer watermark over the player. Prolaud does not claim to prevent screen recording, because no web platform can.

## Related

- [Recording retention](https://prolaud.com/glossary/recording-retention)
- [Proctoring](https://prolaud.com/glossary/proctoring)