- How does Forensic Watermarking work?
- Does Forensic Watermarking affect video quality?
- What happens in the event of a leak?
- Working with Forensic Watermarking
Forensic watermarking is a security technology intended to deter the leaking of video assets throughout the various life cycles of a production.
It’s accomplished by embedding an invisible watermark into the videos that acts as a unique identifier to the specific user viewing it. The forensic watermark then follows the asset across any environment where the viewer watches it; from browsers and phones to tablets and set-top boxes. In the event of a leak, the unique watermark then serves to aid us in discovering the source of the pirated material.
Please note that this can only be used for video files and does not currently support Dolby Vision HDR.
There are two other forms of visible watermarking in addition to the invisible type that comes with forensic watermarking - overlay and burn-in. These display information such as user name, IP address, and production on the assets where the viewer is able to see it. Visible overlay watermarking simply displays that information over the video as it’s being viewed, whereas visible burn-in watermarks are encoded into the video at point of play. Moxion provides visible burn-in watermarking on both streaming and downloaded assets.
Forensic watermarking’s advantage when compared to visible overlay is that the watermarking is encoded into the file itself, and not as information that the file could be pulled out from under and severely hinder any ability to successfully investigate and discover the source of a leak. Compared to visible burn-in, forensic watermarking gives viewers a full, clean image to watch without the presence of any other distracting information while also being able to play a role in detection when visible watermarks have been tampered with or masked.
Any of those options are valuable deterrents to the pirating of assets. If someone sees or knows that personally identifiable information is attached to a file, they’re less likely to try stealing it, but only forensic watermarking is able to maintain both a robust level of asset security and image quality that delivers at all stages of modern film and television production.
How does Forensic Watermarking work?
Moxion partners with ContentArmor to deliver forensic watermarking that maintains our high standards of asset security, and the process starts after an asset has been uploaded.
Once that’s complete, the asset goes through a stage called profiling. This analyzes and identifies portions of the asset’s bitstream - the ones and zeroes it’s made of - where imperceptible forensic watermarking changes can be made to the video. Each combination of changes is called an Identifier, and they’re all generated, saved, and copied into a database to be used for potential future investigations.
The identifiers are also kept for future transmission within the asset at the point of play. When a viewer logs in to Moxion and starts watching a forensically watermarked asset, the changes identified during processing are then embedded into their stream as it plays back. If the asset is downloaded for offline viewing, the identifiers are encoded into the file upon download.
While this does incur an upfront time investment at the upload/processing stage, there is almost no added delay upon playback when watching forensically watermarked assets.
Does Forensic Watermarking affect video quality?
The changes being applied to videos through this process are visually imperceptible. Picture quality analysis of ContentArmor’s high fidelity forensic watermarking on assets has been assessed by studio-affiliated golden eyes; sight experts trained to perceive the smallest imperfections or impositions in an image.
What happens in the event of a leak?
In the event that an asset ends up in the wild, an investigation can be performed to determine where it originated from utilizing forensic watermarking and a list of suspected source assets. The watermark itself is capable of surviving a range of signal processing attacks, as well as conversion from digital-to-analog or analog-to-digital.
The key components to a successful forensic investigation are a copy of the pirated asset and a list of the suspected source assets on Moxion. With that information, we then work with ContentArmor and ascertain the specific origin of the leak. In the initial stages of this process we can also determine whether or not a leaked asset has come from Moxion.
Working with Forensic Watermarking
While forensic watermarking has the benefits of being imperceptible, traceable, and robust, there are some factors to take into account when using it.
- Processing time is about doubled, and should be factored in when uploading any video assets. The forensic watermarking Moxion employs is only applied to the visual portion of videos and audio remains untouched by forensic watermarking.
- Note that original files are kept as-is upon upload to Moxion, and do not get forensically watermarked. It is only proxy files that are encoded with forensic watermarking
- For anyone who has the permissions to remove watermarks (Admins or Downloader (no watermark), it should be noted that this does NOT apply to forensic watermarking. If forensic watermarking is enabled, regardless of your watermarking settings all proxies will be forensically watermarked. If you are downloading a proxy it will always have forensic watermarking applied.
There are also some factors that can limit the effectiveness of forensic watermarking.
- An asset length of about two minutes provides the ideal minimum for the most robust watermarks. Shorter clips will still be watermarked, but that decreased runtime means less data to work with in embedding identifiers. That said, a short clip with many visual changes is as good as most longer ones.
- Assets with higher amounts of visual variety allow for profiling to produce more and better identifiers than those with predominantly static imagery. Clips from Editorial or VFX workflows (including previs) are ideal, and about half of those that come through from Moxion Immediates are well-suited to this forensic watermarking.
- Some clips may not be able to give us automated detection when performing forensic investigation. In such an event, Moxion may need to provide a copy of the suspected original asset to ContentArmor for further inquiry.