Solution Brief

Digital Watermaking is the process of applying invisible, unhearable encrypted packets into the content streams that later enable to identify the content per channel, territory or down to a specific end-user. Noisypeak offers end-to-end watermarking solution which can be applied to existing content items or include additional transcoding and DRM protection steps offered by Noisypeak Cloud.

As part of the offer we provide tools and services to perform digital forensic to identify sources of the leak and content analysis.

Protection of audio and video assets

Tracking of copyright ownerships

Robustness to copying including camripping

Facilitating of digital forensics

Can be applied to specific VOD asset, specific stream or to an individual user copy in the process of delivery of the content.

Additional advantages

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.

we offer

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);
DASH;
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.

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.