Trustworthiness of video data streams

Apparatus for rendering a video data stream having a video encoded thereinto checkable on trustworthiness, wherein the apparatus comprises:

• a processor, configured for
• subjecting a predetermined portion of the video data stream, or data derived therefrom, to a hash function to obtain a hash value;
• computing a digital signature based on the hash value so as to digitally sign the hash value, and
• inserting the digital signature into the video data stream, thereby allowing determining whether the video data stream is trustworthy by checking whether the hash value fits to the digital signature;
• and further configured for
• inserting an overview supplemental enhancement information message into the video data stream, the overview supplemental enhancement information message indicating one or more substreams of the video data stream with respect to each of which the checking the video data stream on trustworthiness is possible based on one or more portions in the respective substream;
• and
• rendering the video data stream checkable on trustworthiness with respect to a subset of one or more substreams of the one or more substreams, so that respective portions of the video data stream for the one or more substreams are to be located in the video data stream by
• checking, for a picture unit of the video data stream, whether the video data stream includes a substream selection supplemental enhancement information message for the picture unit, and
• assigning video coded layer payload packets of the picture unit to a first substream of the one or more substreams, if the video data stream does not include a substream selection supplemental enhancement information message for the picture unit, and
• if the video data stream includes a substream selection supplemental enhancement information message for the picture unit, assigning video coded layer payload packets of the picture unit to a substream of the one or more substreams, which substream is indicated by the substream selection supplemental enhancement information message.

Method for checking a video data stream having a video encoded thereinto on trustworthiness, wherein the method comprises:

• subjecting a predetermined portion of the video data stream, or data derived therefrom, to a hash function to obtain a hash value;
• deriving a digital signature from the video data stream;
• checking whether the hash value fits to the digital signature to determine whether the video data stream is trustworthy;
• deriving an overview supplemental enhancement information message from the video data stream, the overview supplemental enhancement information message indicating one or more substreams of the video data stream with respect to each of which the checking the video data stream on trustworthiness is possible based on one or more portions in the respective substream;
• and
• performing the checking the video data stream on trustworthiness with respect to a subset of one or more substreams of the one or more substreams by determining respective portions of the video data stream for the one or more substreams by
• checking, for a picture unit of the video data stream, whether the video data stream includes a substream selection supplemental enhancement information message for the picture unit, and
• assigning video coded layer payload packets of the picture unit to a first substream of the one or more substreams, if the video data stream does not include a substream selection supplemental enhancement information message for the picture unit, and
• if the video data stream includes a substream selection supplemental enhancement information message for the picture unit, assigning video coded layer payload packets of the picture unit to a substream of the one or more substreams, which substream is indicated by the substream selection supplemental enhancement information message.

Non-transitory digital storage medium having stored thereon a video data stream, wherein the video data stream has a video encoded thereinto by a method for rendering a video data stream having a video encoded thereinto checkable on trustworthiness, the method comprising:

• subjecting a predetermined portion of the video data stream, or data derived therefrom, to a hash function to obtain a hash value;
• computing a digital signature based on the hash value so as to digitally sign the hash value,
• inserting the digital signature into the video data stream, thereby allowing determining whether the video data stream is trustworthy by checking whether the hash value fits to the digital signature;
• inserting an overview supplemental enhancement information message into the video data stream, the overview supplemental enhancement information message indicating one or more substreams of the video data stream with respect to each of which the checking the video data stream on trustworthiness is possible based on one or more portions in the respective substream;
• and
• rendering the video data stream checkable on trustworthiness with respect to a subset of one or more substreams of the one or more substreams, so that respective portions of the video data stream for the one or more substreams are to be located in the video data stream by
• checking, for a picture unit of the video data stream, whether the video data stream includes a substream selection supplemental enhancement information message for the picture unit, and
• assigning video coded layer payload packets of the picture unit to a first substream of the one or more substreams, if the video data stream does not include a substream selection supplemental enhancement information message for the picture unit, and
• if the video data stream includes a substream selection supplemental enhancement information message for the picture unit, assigning video coded layer payload packets of the picture unit to a substream of the one or more substreams, which substream is indicated by the substream selection supplemental enhancement information message.