A DRM biztonsági szintje, ezzel védik hogy ne tudd egyszerűen lementeni a stream-et és elérhető legyen a nagyobb felbontás is. Netflix-hez, Amazon Prime-hoz is kell a megfelelő szint, aminek L1 esetében ezek a feltételei:

Key requirements of this security level:
● Device manufacturers must provide a secure bootloader. The chain of trust from the
bootloader must extend through any software or firmware components involved in the
security implementation, such as the ARM TrustZone protected application and any
components involved in the enforcement of the secure video path.
● The Widevine keybox must be encrypted with a device-unique secret key that is not
visible to software or probing methods outside of the TrustZone. The Widevine key-box
must be installed in the factory or delivered to the device using an approved secure
delivery mechanism.
● Device manufacturers must provide an implementation of the Widevine Level 1
OEMCrypto API that performs all key processing and decryption in a trusted
environment.

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