Verimatrix, Inc.

Comvenient Gmbh & Co. Kg

Betaresearch

Ingo Barth

Petr Peterka

Niels J Thorwirth

Hubert E Kukla

Klaus Schenk

Hubert Kukla

Peter Tücke

Tobias Strobel

Systems and methods for securing communications in a playback device using a key base and at least one key contribution in accordance with embodiments of the invention are disclosed. In one embodiment, a process includes generating a key base using a decryption key and at least one key contribution, where the decryption key can be recovered using the key base and the at least one key contribution, receiving the key base, receiving the at least one key contribution, sending the key base to a decryption module, sending the key contribution to a control module, performing a control feature on the piece of content using the control module, providing the key contribution to the decryption module when the control feature is performed, generating the decryption key using the key base and the at least one key contribution, and accessing at least a portion of the piece of content.

Securing communication in a playback device with a control module using a key contribution

The invention relates to a method for decrypting encrypted broadband data by one or more authorized users comprising the following steps: provision of the encrypted broadband data () for a plurality of users; provision of encrypted or non-encrypted key data (), which is of a comparatively narrower band than the broadband data () and which is personalized for one or more authorized users, exclusively in a decryption unit (), said narrow-band key data () being held in the decryption unit () in a form that is not accessible to the authorized user; at least partial decryption of the encrypted broadband data () in the decryption unit () in order to output a broadband data stream () that is at least partially decrypted; or generation of broadband key information () from the narrow-band key information () in the decryption unit () for the subsequent decryption of the encrypted broadband data ().

Method and apparatus for decoding broadband data

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Unterföhring, Germany

Ingo Barth