---
title: "Watermark Embedding"
description: "This document describes how to embed unique information about the playback session invisibly in the video."
---
> For the complete documentation index, see [llms.txt](https://docs.doverunner.com/llms.txt).

DoveRunner Forensic Watermarking combines two versions of videos marked '0' and '1' in real-time at playback. It converts session information, such as user ID, to binary format, and thus composes the output stream by combining segments from the DASH or HLS content.

As a result, unique information about the playback session is inserted invisibly in the video and sent to the client.

```mermaid
sequenceDiagram
    box End User
    participant A as End user
    end
    box Content Service
    participant B as Service site
    participant C as CDN
    end
    box DoveRunner
    participant D as DoveRunner service
    end
    A ->> B: Request URL for playback
    B ->> D: Content URL, Session data
    Note right of D: Session manager
    D -->> D: Generate session key(payload) and store session data
    D ->> B: Send Session URL
    B ->> A: Send Session URL
    A ->> C: Start playback of Session URL (request segments)
    Note right of C: Watermark embedder module
    C -->> C: Segments mixing by Session URL
    C ->> A: Send mixed segments
    Note right of A: Playback mixed content
```

> The segment list of the DASH manifest (.mpd) or HLS playlist (.m3u8) passed as a Session URL applies the same path and filename to all users, regardless of session information. Therefore, it is **safe from segment naming attack** which is mixing the segment lists of multiple sessions for the same content.

You can use the following documents to integrate the watermark embedder module with the session manager API.

- [Session Manager API Guide](https://docs.doverunner.com/content-security/forensic-watermarking/embedding/session-manager/)
  This document describes how to integrate the session URL for the watermark embedding through DoveRunner session manager API.
- [CloudFront CDN Embedder Module](https://docs.doverunner.com/content-security/forensic-watermarking/embedding/cloudfront-embedder/)
  This document describes the Lambda@Edge embedder module that works with Amazon CloudFront CDN.
- [Akamai CDN Integration](https://docs.doverunner.com/content-security/forensic-watermarking/embedding/akamai-integration/)
  This document describes how to apply Forensic Watermarking embedding with Akamai CDN.
- [Cloudflare Workers Integration](https://docs.doverunner.com/content-security/forensic-watermarking/embedding/cloudflare-embedder/)
  This document describes how to apply Forensic Watermarking embedding with Cloudflare.