Unique granular digital watermarking technology for Live and VOD content
Digital Watermaking is the process of applying invisible, unhearable encrypted packets into the content streams that later enables to identify the content per channel, territory or down to specific end-user.
Protection of audio and video assets
Tracking of copyright ownerships
Robustness to copying including camripping
Facilitating of digital forensics
Wide range of content usage on any platform and any distribution model
Can be applied to specific VOD asset, specific stream or to an individual user copy in the process of delivery of the content.
Digital watermarks keep the signal almost unmodified
In contrast to the currently accepted procedures for embedding digital watermarks our technology offers additional advantages:
Time and computing efforts are clearly reduced when generating individual copies;
The secret watermark key is not needed to generate individually marked copies;
The possibility to retrieve the unmarked original file;
Digital watermarks are encrypted and there is no way to check their existence by unauthorized third- parties.
The following example, we offer to implement audio watermarks into the audio-visual content. The following types of content will be processed:
HLS v2/3 (audio is muxed with TS video stream);
HLS v5 (audio is a separate track in the playlist);
Google Classic DRM (WVM, audio is muxed with TS video stream).
DRM digital watermarks
Digital watermark is an imperceptible method of signal coding within the digital audio/video streams contained the identifying information. Digital watermark not distorted or lost when the signal is passed through a conversion or compression processes.
Watermarks are encrypted to increase the resistance of the DRM systems. Encrypted watermarks are tamper resistant and can be used to identify that the media is authentic or to provide other information about the media such as its legal owner or content source. Content owners can identify the watermarks in the media files or streams by deciphering the content.
Figure above shows how watermarks can be added to a variety of media types to provide identification information. This example shows that digital watermarks can be added to digital audio or video media by making minor changes to the media content. The digital watermark is added as a code that is typically not perceivable to the listener or viewer of the media. This example shows that digital watermarks can be added to audio signals in the form of audio components (e.g. high frequency sound) or video components (color shift) that cannot be perceived by the listener or viewer.
Noisypeak digital watermarking solution
Quality assessment is given by the commercial OPERA assessment tool which implements the PEAQ model. The tool details the sound quality difference between reference and test signal by the objective difference grades (ODG). The following table gives the definition of the ODG values and shows, in simple words, how much worse a test signal sounds to an average listener compared to the reference signal.
To perform the quality assessment 180 audio tracks are used including pop music, classical music, audio book, interview recordings and camera recording. The x- axis shows the 180 files and on the y-axis the ODG value are printed on the left image. The table below shows the summarized results of all files in a boxplot.
|-1||“Audible but no annoying”|