# AI Privilege Isolation for Law Firms

> Prove privileged material never reached a third-party AI model. RankShield attests isolation and informed consent with post-quantum-signed, verifiable records.

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# Prove privileged data never reached the model.
**Privilege isolation is a cryptographic attestation that privileged client material was withheld, redacted, tokenized, or kept on a local model — never transmitted to a third-party AI in retrievable form.** Each attestation binds the interaction, the approved tool, the governing policy, and the client’s informed consent into one independently verifiable record.
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A zero-retention contract is a promise about what a vendor did after your data arrived. An attestation proves the data never left the approved boundary in the first place. For a firm answering an outside-counsel guideline or a client audit, that is the difference between a representation and evidence.

## Why is zero data retention not enough?
Zero-retention contracts are a promise about what a vendor did with your data after it arrived. They presume the data reached the model, and they ask everyone to trust that the term was honored. An attestation inverts that: it proves privileged material never left the approved boundary in retrievable form. One is a representation; the other is evidence you can produce when a client, regulator, or opposing party asks.

## What does the attestation bind?

- An interaction digest — a cryptographic fingerprint of the specific AI interaction.
- The approved tool identifier — which vetted system handled the work.
- The governing policy in force at the time of the interaction.
- The client’s informed consent — the step ABA Formal Opinion 512 requires before client information enters a self-learning generative AI tool.

## What it proves — and what it does not
The attestation proves **architecture and consent**: that isolation functioned as designed and consent was captured, signed with post-quantum cryptography and sealed to a tamper-evident log anyone can verify. It does not — and cannot — guarantee a court will find privilege preserved or unwaived. Privilege is a legal conclusion; the attestation is the strongest evidence that reasonable, verifiable steps were taken. ABA Opinion 512 addresses the ethical confidentiality duty under Model Rule 1.6, which is distinct from evidentiary privilege — we keep that distinction explicit.

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## Privilege Isolation, answered
The questions law firms ask about privilege isolation, answered directly. **No forms, no sales pitch.**

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- **What are the four isolation methods?** Withholding (privileged content is never sent), redaction (privileged passages are removed before transmission), tokenization (sensitive values are replaced with non-reversible tokens), and local-model processing (the material never leaves your controlled environment). The attestation records which method was used for each interaction, so the decision is auditable rather than taken on faith.
- **Does this prevent privilege waiver?** No, and no vendor can honestly claim that. Waiver is a legal determination courts make case by case. What the attestation provides is independently verifiable evidence of the technical steps and the consent process — a record that privileged material was architecturally isolated — which supports your position without overstating what technology can promise.
- **Why are the attestations post-quantum signed?** Because privilege never expires. An attestation may need to remain verifiable for decades, and signatures based on RSA or ECDSA are scheduled for deprecation after 2030 under NIST’s transition guidance. Signing with ML-DSA and SLH-DSA (NIST FIPS 204/205) means the proof survives the quantum transition — quantum-safe, not quantum-proof.

Keep exploring
## Related work
[Solutions Client Confidentiality & AI The Model Rule 1.6 / ABA Op. 512 confidentiality duty around generative AI — and how to prove isolation, not promise it. Explore →](https://rankshieldlegal.com/client-confidentiality-ai/)[Platform Quantum-Safe Security Post-quantum signatures on records whose confidentiality obligations outlast the cryptographic transition. Explore →](https://rankshieldlegal.com/quantum-safe-law-firms/)[Platform AI Tool Attestation A single governed checkpoint in front of Harvey, CoCounsel, Copilot and agentic tools — signed attestation per action. Explore →](https://rankshieldlegal.com/ai-tool-attestation/)