Watermarking — SynthID, Stable Signature, C2PA
Three technologies structure 2026 AI-generated-content provenance. SynthID (Google DeepMind) — image watermarking launched August 2023, text+video May 2024 (Gemini + Veo), text open-sourced October 2024 via Responsible GenAI Toolkit, unified multi-media detector November 2025 alongside Gemini 3 Pro. Text watermarking adjusts next-token sampling probabilities imperceptibly; image/video watermarks survive compression, cropping, filters, frame-rate changes. Stable Signature (Fernandez et al., ICCV 2023, arXiv:2303.15435) — fine-tunes the latent diffusion decoder so every output contains a fixed message; cropped (10% of content) generated images detected >90% at FPR<1e-6. Follow-up "Stable Signature is Unstable" (arXiv:2405.07145, May 2024) — fine-tuning removes the watermark while preserving quality. C2PA — cryptographically signed, tamper-evident metadata standard (C2PA 2.2 Explainer 2025). Watermarking and C2PA are complementary: metadata can be stripped but carries richer provenance; watermarks persist through transcoding but carry less information.
This lesson isn’t interactive yet.
It is part of the curriculum and will get the same treatment as Phase 1 — a visual cover, hands-on labs, derivations with numeric checks and a quiz. Until then, the original lesson is the best place to read it:
Part of Phase 18 — Ethics, Safety & Alignment. Use the previous / next cards below to keep browsing the phase.