Each individual copy of a video file can be marked with an unnoticeable watermark, known as an invisible watermark or a forensic watermark. To put it another way, the forensic watermark is a code or a group of characters that is inserted into the digital file that allows the unique identification of the content originator and its authorised user. There should be no way to erase a forensic watermark without altering the host video, and the watermark should be absolutely undetectable. It should also be safe, meaning it can’t be tampered with or made to look like something else. To keep up with the rapid expansion of digital and OTT content production and consumption, digital rights management (DRM) companies are increasingly using forensic watermarking techniques. Here are some examples of how digital watermarking technology can be used:
Channel names are incorporated in the audio of several TV channels in Europe and the United States to aid with audience monitoring. This is done by the use of a device in the viewer’s house, which records sound, decodes messages, and delivers them to the monitoring firms for analysis.
External stakeholders of the studio receive pre-release content with a static watermark added to it, which prevents unlawful use.
For the purpose of detecting and tracking unlawful recordings, movie theatres use digital watermarks that include theatre and screen time information. For the most part, the encoded message contains the projection date and beamer ID.
Online video services like Netflix and Amazon Prime utilise digital watermarks for DRM protected content in order to monitor subscribers in the event that illicit use of the protected content is detected by the service.
OTT Live Service: The subscriber label is also applied to live/linear programming, such as real-time sports.
Visible video watermarking, on the other hand, manipulates the video bitstream so that a visible logo or watermark may be seen. Care must be made to ensure that any apparent watermarks do not interfere with the viewing experience. Video assets can be protected from unlawful use by using visible watermarks. Watermarking that may be seen during playback can be used to identify the video’s owner and to provide a modest branding of the content creators/distributors.
Watermarking protects digital files by injecting invisible information. This data can then be collected in the event of an infringement in order to pinpoint the precise source of the leak. However, this little adjustment to the digital content is often permanent, as the watermarked version differs from the original un-watermarked version. This means that any subsequent use of the content would be on a slightly corrupted version, making irreversible watermarking unsuitable for critical applications such as military investigation, medical diagnostics, and space exploration.
When a video request is made, the edge server verifies the WMID token’s authenticity. Once the compliance tests return positive results, the requested ABR video is watermarked using the WMID contained in the token. The CDN then distributes pre-watermarked versions of the video in order to provide each client with a distinctively watermarked video stream.