Nokia Technologies Oy

Enrique Martin Lopez

Troels Roennow

Karina Palyutina

Edward FitzGerald

According to an example aspect of the present invention, there is provided a method, comprising: receiving a cryptographic proof of use indicative of decoding of a first media content element by a user device (), receiving a cryptographic first expected proof of use value (), and controlling access to an encrypted second media content element associated with the first media content element on the basis of verification of the received cryptographic proof of use and the first expected proof of use value ().

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Madrid, Spain

Enrique Martin Lopez