Unlinkable content playbacks in a multiparty DRM system

TL;DR

This paper proposes a privacy-preserving multiparty DRM system that enables users to play content anonymously across multiple distributors without relying on trusted third parties, using a re-encryption scheme on Android devices.

Contribution

It introduces a novel DRM approach that preserves user privacy and operates without trusted third parties, utilizing re-encryption on mobile devices and minimal security operations on smartcards.

Findings

Achieves unlinkable content playback in multiparty DRM.

Operates efficiently on Android devices without trusted third parties.

Uses minimal security-critical operations on smartcards.

Abstract

We present a solution to the problem of privacy invasion in a multiparty digital rights management scheme. (Roaming) users buy content licenses from a content provider and execute it at any nearby content distributor. Our approach, which does not need any trusted third party--in contrast to most related work on privacy-preserving DRM--is based on a re-encryption scheme that runs on any mobile Android device. Only a minor security-critical part needs to be performed on the device's smartcard which could, for instance, be a SIM card.