Widevine is a DRM system owned by Google. This allows companies like Netflix, Disney+, Amazon Prime, HBO, Hulu, and many more to protect their content from piracy, copying, and redistribution. If you’ve ever been unable to play a Netflix video beyond a particular resolution, then it was Widevine at play.

The Widevine protocol is free for device manufacturers. If your device follows certain guidelines, it can have the Widevine certification. There are three levels of the certification – L1, L2, and L3.

Widevine L1 Certification:

Widevine L1 is the highest degree of DRM protection, and video decryption and processing take place entirely within the Trusted Execution Environment in devices that support it (TEE). Widevine L1-certified devices can play videos at the best resolution possible

Widevine L2:

Widevine L2 is the second level, which incorporates software-based video processing or dedicated video hardware. Widevine L2 devices sometimes have a higher resolution output than Widevine L3 devices, up to 540p resolution.

Widevine Level 3

This is the most basic certification available, requiring only software-based DRM. The content will typically only play at 480p resolution if you have a Widevine L3-certified device. For DRM encryption, L3 also typically means there is no Trusted Execution Environment (TEE) to secure the content.

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Source : Google

Thanks

@Naveen Yerradla