Unlinkable content playbacks in a multiparty DRM system
This addresses privacy concerns for users in digital content distribution, though it appears incremental as it builds on existing re-encryption methods without a trusted third party.
The paper tackles privacy invasion in multiparty DRM systems by enabling unlinkable content playbacks without a trusted third party, achieving this through a re-encryption scheme that runs on mobile Android devices with minimal smartcard involvement.
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.