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  • Hacker News
  • Does code also get watermarked? Surely you can't add non printable characters, except perhaps in comments?
    by cm2187
  • How long before they change the terms and conditions to subtly claim ownership of your files? When you write code they already insert Co author attribution/

    Say I write a text by hand And then I tell it to clean up the grammar and fix some sentences Did it make it?

    This is also interesting for those companies that siphoned the entire open web

    by kbrannigan
  • Up next:

    1. Generate a bunch of responses with both Claude and various non-Claude LLMs (ChatGPT, Gemini, Kimi)

    2. Train a discriminator model that can differentiate Claude vs. non-Claude

    3. Train a de-watermarking model using the discriminator model as loss

    by qurren
  • What is interesting to me is that stripping the C2PA data is easy, but faking it is hard.

    You can resave the file and the "made with Claude" signal disappears, but you cannot make a random file pass as Claude-made without Anthropic's signing key. So the useful guarantee is one-way. No signature means almost nothing.

    by coffeecoders
  • This is really fascinating. Even the AI companies have incentives to reject AI generated content. It's like they want you to use AI for everything, but they don't want AI output fed back to them.

    At work, right after an AI training, we were asked to use our "authentic" voice when writing mid year reviews.

    by firefoxd
  • This is just C2PA for Claude-processed files, apparently. It's not related to their text watermarking.

    C2PA is file metadata and can be trivially stripped away, unlike hidden watermarks, e.g. SynthID.

    by Tiberium
  • As far as I can tell, this and the recent change to add watermarking to text outputs[1], is to become compliant with the EU AI Act[2] and CA's AI Transparency Act[3], SB-942[4]. For large enough companies, all generated AI content is required to have watermarking.

    [1] https://www.anthropic.com/news/claude-text-watermark

    [2] https://digital-strategy.ec.europa.eu/en/policies/code-pract...

    [3] https://www.kqed.org/news/12095398/new-california-law-requir...

    [4] https://www.leginfo.legislature.ca.gov/faces/billTextClient....

    by csmoak
  • Under what circumstances does the metadata get added? When Claude Code CLI needs a media file usually I just see it run an imagemagick or ffmpeg command to create one, which isn't going to have C2PA metadata.

    Edit: I asked Opus 5 for "a jpg of a cat" via the web chat. It did it by writing an svg and then rendering that to a jpeg. Clicking the "download" button saved a jpg which did have C2PA metadata, seemingly injected by the artifact-presentation thing.

    Then I told it to put it in a zip file. I downloaded the zip, and the extracted jpeg had no C2PA metadata.

    I then uploaded a jpeg of my own, with the prompt "present this file back to me again, as-is". The downloaded file had C2PA metadata injected.

    Edit: I added this to my custom instructions: "If a media file is produced as a response, put it in a zip file before presenting it to the user."

    by Retr0id

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