Check a video for our marks

1. Content Credentials (C2PA)

Our files are signed with C2PA Content Credentials. They state that the file contains content generated by AI (“Composite including generative AI elements”) and that ClonifyLab signed it, with a trusted time stamp.

• Open the file in a free Content Credentials checker, such as contentcredentials.org/verify, or run the open-source c2patool.
• Our signing certificate is issued by our own root, which isn’t on public trust lists, so a checker may call the signer “unknown”. Compare the certificate with ours below.
• Social platforms often remove this metadata from posted videos. The watermark (step 2) stays.

2. The invisible watermark

The picture carries a Meta Video Seal 1.0 watermark (256 bits) and the sound a Meta AudioSeal 0.2 watermark (16 bits). Both use one public key: the SHA-256 digest of the text ClonifyLab AI-generated v1:

9c249661471a5e7fc3aef2b1714b4280b416d12cf5db18c87a9d8c6984fa36d6

The picture uses all 256 bits, the sound the first 16 (byte 0 first, most significant bit first).

Run the free check

• Download our script: verify.py (the same script our own final check runs on every video).
• You need Python 3.10 or newer and FFmpeg 5.1 or newer (ffmpeg and ffprobe on your PATH).
• Download the two model files (MIT licence; the script checks their SHA-256 before loading them):

Then install the libraries and run the check:

pip install torch --index-url https://download.pytorch.org/whl/cpu
pip install numpy omegaconf einops
pip install --no-deps audioseal==0.2.0
python verify.py my-video.mp4 --video-model y_256b_img.jit --audio-model detector_base.pth

It prints, for example, AI-generated by ClonifyLab: yes (p = 4.1e-62), plus one line each for the picture and the sound. The p-value is the chance that a video without our watermark would match our key this well; the script says “yes” at one in a million or less.

What the marks can and can’t prove

• The watermark is a label, not a signature: the models are open and the key is public, so someone could copy or remove it. The signed C2PA Content Credentials are the proof that a file came from us.
• Heavy edits, such as cropping more than 10–20%, rotating, screen recording or re-making the video with AI, can remove the watermark.
• A picture with almost no texture (one flat colour) can’t carry the picture watermark; our final check rejects such a video before it’s delivered.
• Found our mark in a video that misuses someone’s face or voice? Report it, and we act within 48 hours.