Answers
What is forensic watermarking?
An invisible mark that says where a copy came from.
Forensic watermarking is the technique of hiding an identifying signal inside a video's picture so that, if a copy turns up somewhere it should not, software can read the signal and tell you its source. It is called forensic because it is used after the fact, to investigate a leak.
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By uncompressed.io · Updated October 2026
Short answer
What is forensic watermarking?
Forensic watermarking hides an invisible identifying signal in a video's picture so that a leaked copy can be traced to its source. When the mark is unique to each viewer or buyer, a copy found online points back to the account it was played from. It does not stop copying; it makes copies traceable.
- An invisible signal hidden in the picture
- Read by detection software, not by eye
- Per-viewer marks identify one account's copy
- Does not prevent copying; it traces copies
- Can be weakened by heavy edits or camera recording
- Leak Shield per-buyer marks: USD 99 a month or USD 1,188 a year
How it works
From embedding to detection
in four steps
The details differ between systems, but every forensic watermark follows the same life cycle.
Embed
A small, imperceptible change is made to the picture that encodes an identifier, such as a buyer or session.
Deliver
Each viewer receives a copy carrying their own identifier. Normal viewing looks exactly the same.
Find
A copy appears online. Someone has to find it, by searching hosts, torrent indexes and the open web.
Detect
Software reads the hidden signal from the recovered copy and returns the identifier it was carrying.
Kinds of forensic mark
Same mark or one per viewer
and what each one identifies
Protection reduces risk and makes leaks traceable; it cannot guarantee a film never leaks or that every leak can be traced.
What it can prove
Evidence, not a verdict
and where to be careful
What it shows
That a recovered copy carries the identifier of a particular buyer or session. Combined with your sales records, that points to the account the copy came from.
What it does not show
Who physically pressed record. A shared login, a family member or a stolen password can all sit behind one account. That is why a person should review every match.
Leak Shield is built around that review. It searches the open web and torrent indexes weekly for the first month after release and monthly after, and reports each sighting to you. Nothing happens to a buyer until you confirm. On confirmation, the buyer is identified and blocked, their membership is cancelled, a takedown notice is sent and a PDF case file is kept with the evidence.
If you share pre-release cuts with a small group rather than selling, see forensic watermarks for video screeners, which lists the questions to ask any provider, and the Vault, which plays films in the compatible macOS app with a session watermark.
The limit
Questions
Frequently asked
What is forensic watermarking in simple terms?
It is an invisible mark hidden in a video's picture that software can read later. If the mark is different for each viewer, a leaked copy tells you which viewer's copy it was.
Is a forensic watermark visible?
No. It is designed to be imperceptible during normal viewing. A visible watermark, such as a logo, is a different tool.
What is the difference between forensic watermarking and DRM?
DRM encrypts a stream so only licensed players can play it, which aims to prevent copying. Forensic watermarking does not prevent copying; it identifies the source of a copy afterwards. They are often used together by large studios. uncompressed.io does not offer DRM.
Can a forensic watermark survive screen recording?
It is designed to, because the mark is part of the picture that gets recorded. Heavy cropping, scaling, recompression or filming the screen with a camera can weaken it, so recovery is not guaranteed.
Is a forensic watermark proof of who leaked a video?
It is strong evidence about which account's copy was leaked. It does not by itself prove who physically made or posted the copy, for example if an account was shared. Treat it as the start of a decision, not the end.
Who uses forensic watermarking?
Studios and broadcasters use it for screeners and premium releases. Independent creators can now use it too: on uncompressed.io, Leak Shield adds a per-buyer forensic mark for USD 99 a month or USD 1,188 a year.
Forensic marks for every buyer, without an enterprise contract.
Leak Shield gives every buyer their own invisibly marked copy and searches for leaks, for USD 99 a month or USD 1,188 a year on any paid plan. Protection reduces risk and makes leaks traceable; it cannot guarantee a film never leaks or that every leak can be traced.
Sources
- 1.W3C Encrypted Media Extensions, Working Draft (dated 7 July 2026, read 12 October 2026)
- 2.US Copyright Office: Section 512 of Title 17 (read 12 October 2026)