Video encryption
Video encryption is the process of scrambling video data with a secret key so that only players with the right key can decode and play it. Encryption can protect video while it is stored, while it travels over the internet and during playback. In streaming, common approaches include AES-128 encryption of HLS segments and DRM-based encryption using common encryption (CENC).
Why it matters
Encryption is the base layer of almost every content protection setup. It protects revenue from paid content, meets studio and enterprise security requirements and reduces risk if files leak from storage. On its own it does not stop screen recording, so high-value content needs more layers.
How it works
- Video is encrypted with a secret key, usually using the AES algorithm.
- Encrypted files are stored and delivered through a CDN like any other video.
- Authorized players get the key, either directly or inside a DRM license.
- The player decrypts the video during playback, so files copied without the key cannot be watched.
Is encrypted video the same as DRM?
No. Encryption scrambles the video, while DRM adds secure key delivery and playback rules on top. With basic encryption, such as HLS AES-128, the player receives the key directly. With DRM, the key is protected inside a secure module on the device and comes with rules such as expiry or resolution limits.
Does video encryption stop screen recording?
Encryption alone does not stop screen recording, because the video must be decrypted to be shown. DRM on some devices can black out screen captures, but nothing stops someone filming a screen with a phone. Visible or forensic watermarks are used to discourage recording and trace leaks.
Where it's used
OTT services encrypt video to meet studio contracts, while online learning platforms and microdrama apps use it to keep paid courses and episodes from being copied.
By the numbers
- NIST announced the Advanced Encryption Standard as FIPS PUB 197 on November 26, 2001, and it became effective as a US federal standard on May 26, 2002. (Wikipedia: Advanced Encryption Standard)
