EU AI Act Content Watermarker SDK
Article 50 of the EU AI Act requires machine-readable watermarks on ALL AI content by August 2, 2026. You have 5 weeks.
The Problem
Under Article 50 of the EU AI Act, any AI system producing public synthetic text, images, or audio must embed machine-readable transparency markers. No LLM API does this automatically. Most developers have no idea how to implement cryptographically signed watermarks in a Next.js streaming response.
The Solution
A drop-in serverless SDK for Next.js that automatically appends C2PA-compatible, cryptographically signed transparency metadata into AI-generated text streams and binary image outputs at the Vercel Edge layer, before content reaches the browser.
Why You Have No Choice
Non-compliance means fines up to €15M or 3% global annual turnover from August 2026. There is no manual implementation shortcut — you need this SDK.
Code Preview
This is what you'll drop into your codebase. The full package includes all configuration options and integrations.
// watermarker.sdk.ts — wrap your AI response stream
import { watermarkStream } from './watermarker.sdk'
export async function POST(req: Request) {
const stream = await openai.chat.completions.create({
model: 'gpt-4o', messages: [...], stream: true
})
// Automatically embeds C2PA watermark + audit log
return watermarkStream(stream, {
modelId: 'gpt-4o',
generatorId: process.env.EU_AI_GENERATOR_ID!,
signWithKey: process.env.C2PA_PRIVATE_KEY!,
auditBucket: 'my-compliance-bucket', // your own S3/R2
})
}What's in the Package
TypeScript SDK with text watermarker, image watermarker, and audit log writer. Integrates with Next.js streaming responses and image generation APIs.
Compliance Law This Addresses
🇪🇺Errors This Package Fixes
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⚖️ Developer Tool — Important Notice
VektorIndex developer tools are technical software packages provided to assist developers in implementing compliance-relevant technical controls. They do not constitute legal advice, legal services, or a guarantee of regulatory compliance. Each tool solves a specific technical problem — whether a tool satisfies your specific legal obligations depends on your use case, jurisdiction, and how the tool is configured and deployed. You must engage qualified legal counsel to confirm your compliance posture. VektorIndex does not represent that use of any tool will make your product compliant with any specific law or regulation.
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