Why Endorsements Matter: CONFIDENTIAL, AEO, and Other Stamps
Endorsements aren't just stickers — they're enforceable access controls under your protective order. Here's how each tier works.
When you stamp "CONFIDENTIAL" across the bottom of every page in a production, you're not just adding a decoration — you're invoking a contract. The protective order in the case says, in writing, what each endorsement tier means and who can see a document marked at that tier. Get the stamps right and the order enforces itself; get them wrong and you've either over-claimed (which a court can sanction) or under-claimed (which means you just handed sensitive material to opposing counsel without protection).
The three standard tiers
Most federal protective orders track a three-tier hierarchy. The exact wording varies by jurisdiction, but the structure is nearly universal:
1. CONFIDENTIAL
The default protective tier. Documents marked CONFIDENTIAL can be shared with: parties, in-house counsel, outside counsel, retained experts, court personnel, deposition reporters, and litigation support staff working under a confidentiality undertaking. They cannot be filed publicly, attached to a press release, or shown to anyone outside the litigation.
Use it for: business records, internal communications, financial information, employee files, customer lists, and similar competitively sensitive material that doesn't qualify for higher protection.
2. ATTORNEYS' EYES ONLY (AEO)
One step up. AEO documents can be seen only by outside counsel of record, retained experts (with case-by-case authorization in most orders), and court personnel. The party itself — including in-house counsel and the client — cannot review AEO material. This is enforceable; it's why deposition prep with AEO documents is awkward.
Use it for: trade secrets, source code, customer-specific pricing, unredacted competitor information, and material whose disclosure to the opposing party itself (not just the public) would cause competitive harm.
3. HIGHLY CONFIDENTIAL — SOURCE CODE / TRADE SECRET
The strictest tier, used in patent and trade-secret litigation. Most orders require source code review at a secured terminal, no copying, printed pages numbered and tracked, and pre-approval of every expert who reviews. The endorsement is paired with handling protocols, not just an access list.
Less common but worth knowing
- OUTSIDE COUNSEL ONLY (OCO) — a softer version of AEO that allows in-house counsel to review with case-by-case authorization.
- PRIVILEGED & CONFIDENTIAL — used when a document is being clawed back. Shouldn't be in the production at all, but if you find one, this is the marking.
- FOR SETTLEMENT PURPOSES ONLY — invokes Federal Rule of Evidence 408. Doesn't restrict access in the same way but bars use at trial.
- SUBJECT TO FOIA / GOVERNMENT EXEMPTION — for documents produced by federal agencies under a litigation order but still covered by FOIA exemptions.
Where the endorsement goes on the page
Conventions vary, but the safe pattern:
- Top center or top-right of every page, in red or high-contrast text, large enough to read at a glance. Stamping faintly defeats the purpose.
- Bates number stays in the bottom corner — the two should never overlap.
- Don't put the endorsement only on the first page. Page-level access control requires page-level marking.
What happens if you mis-mark
Over-marking (designating non-sensitive material as AEO or CONFIDENTIAL) is the more common abuse. Most protective orders include a meet-and-confer process to challenge designations, and federal judges are increasingly willing to sanction parties who over-designate as a discovery tactic. The rule of thumb: only mark what you'd actually be able to defend at a hearing.
Under-marking is usually the result of process failure — pages that should have been stamped weren't. The consequence is that you've produced sensitive material without protection, and the protective order doesn't apply to the unmarked pages. Courts have generally held that you can't retroactively designate after production without a clawback agreement and re-production of the marked version.
How Stampify handles endorsements
Endorsements are applied at the same moment as Bates numbering, in a single pass. Pick the tier (CONFIDENTIAL, AEO, or a custom endorsement string), pick the placement (top center, top right, watermark across the page), and the entire production gets the marking applied to every page. The exhibit-stamp pass on top of that is independent — your first-page exhibit sticker doesn't fight the page-level endorsement for real estate.
See also: Bates Numbering vs. Exhibit Stamping for the full taxonomy.