Summary. A cease and desist letter is a demand, an offer to negotiate, and an attempt to establish knowledge for a later willfulness claim, all at once. The recipient's first decisions — whether to preserve, whether to respond, whether to stop, and whether to sue first — are made under time pressure with incomplete information and shape everything that follows. This guide covers the first forty-eight hours, how to evaluate the claim on its merits and on the sender's real leverage, when a declaratory judgment action makes sense, how to draft a response that advances your position rather than creating admissions, and how the analysis differs across trademark, copyright, patent, trade secret, restrictive covenant, defamation, and contract claims.

A software company receives a letter from a law firm representing a competitor. It alleges that the company's newly launched product infringes two patents, demands that it cease sales immediately, demands an accounting, and gives seven days to respond before "all available remedies" are pursued.

Three responses, three outcomes.

Response one: ignore it. No preservation, no analysis, no reply. Nine months later the company is sued in an unfavorable district. The complaint alleges willful infringement, and the letter is Exhibit A establishing knowledge of the patents as of its date. Enhanced damages up to treble and attorney's fees are in play under 35 U.S.C. §§ 284 and 285. And a routine document request reveals that the engineering team's chat history from the relevant period was auto-deleted after the letter arrived, producing a spoliation motion.

Response two: answer immediately, at length, from the CEO. A four-page letter explaining the product's architecture in detail, stating that the company "reviewed the patents and believes there is no infringement," and offering to license "on reasonable terms if necessary." That letter is now: an admission of knowledge, a description of the accused product written by a non-lawyer, an implied concession that the patents might be infringed, and — because it discussed a review of the patents — the opening for an argument that the company waived privilege as to any opinion of counsel.

Response three. Litigation hold within 24 hours. A short acknowledgment sent by counsel requesting claim charts and asking for an extension to respond, which is granted. Four weeks of analysis: claim construction, prior art, and — because the letter's specificity created a case or controversy — an evaluation of declaratory judgment jurisdiction. The company identifies a strong invalidity position on one patent and a non-infringement position on the other, and files a declaratory judgment action in its home district before the competitor files anywhere. The case resolves eighteen months later on terms the company can live with, in a forum it chose.

The letter itself did not determine any of that. The first forty-eight hours did.

The first forty-eight hours

1. Do not respond immediately. Almost no letter requires a same-day answer, and the deadline in the letter is the sender's preference, not a legal requirement. The one genuine exception is where the letter is accompanied by a motion for a temporary restraining order, in which case the timeline is the court's.

2. Issue a litigation hold. The duty to preserve attaches when litigation is reasonably anticipated, and a cease and desist letter almost always triggers it. Suspend auto-deletion, notify custodians in writing, and identify the relevant systems — email, chat, source code repositories, design files, sales records, and the personal devices of key people if the claim involves them. Spoliation is the one failure that converts a defensible case into an indefensible one, and it happens by default, through retention policies nobody suspended.

3. Stop the clock on any deadline that matters. If the letter demands action by a date, have counsel request an extension. Senders almost always grant one, because a refusal undermines their later claim of urgency.

4. Do not contact the sender directly. The client's call to the other side's principal, made in good faith to "work it out," is the single most common source of damaging admissions.

5. Restrict internal circulation. Route the letter to counsel and to a small group. Instruct recipients not to discuss it in email or chat, because those communications are discoverable and are rarely helpful.

6. Preserve privilege from the start. Route the analysis through counsel, with a documented legal purpose. Where an opinion of counsel may matter — most importantly in patent cases, where reliance on an opinion can rebut willfulness — understand that relying on the opinion waives privilege as to the subject matter, and make that decision deliberately rather than by accident.

7. Consider whether to stop the conduct. This is the hardest early decision, and it is genuinely two questions. Continuing after notice supports willfulness and enhanced damages in patent and trademark cases, and it strengthens the irreparable harm showing on a preliminary injunction motion. Stopping may be read as an admission, disrupts the business, and may be impossible to reverse. The workable middle positions: stop the specific conduct that is clearly problematic while preserving the rest; make a change that eliminates the alleged infringement without conceding it; or continue while documenting a good-faith basis, developed contemporaneously.

8. Tender to insurers. Advertising injury coverage under a CGL policy may respond to trademark, trade dress, and some copyright and defamation claims. Media, technology E&O, and IP policies may respond as well. Notice is required under most policies on receipt of a claim, and a cease and desist letter is frequently a claim. Late notice is a coverage defense, and tendering costs nothing.

9. Check for a forum selection or arbitration clause. If the parties have a contract, it may already answer where any dispute goes — which changes the declaratory judgment analysis entirely.

Evaluating the claim

Two separate assessments, and both matter.

The merits

Trademark infringement. The question is likelihood of confusion, assessed under the applicable circuit's multifactor test: strength of the mark, similarity of the marks, proximity of the goods or services, evidence of actual confusion, marketing channels, degree of purchaser care, the defendant's intent, and the likelihood of expansion. Also assess: whether the sender's registration is valid and incontestable or vulnerable to cancellation; priority — who used first in which geography; whether the use is descriptive fair use or nominative fair use; whether the claim is barred by laches or acquiescence; and, for a dilution claim, whether the mark is genuinely famous, which is a demanding standard.

Copyright infringement. Assess ownership and registration (registration is a prerequisite to suit for U.S. works, and timely registration determines eligibility for statutory damages and fees, which frequently determines whether the case is economically viable for the plaintiff); access and substantial similarity; whether what was copied is protectable expression rather than an idea, a fact, or a scène à faire; fair use under 17 U.S.C. § 107; whether a license exists, including an implied one; and the three-year limitations period.

Patent infringement. Assess claim construction — infringement is determined claim by claim, element by element, and a single missing element defeats literal infringement; the doctrine of equivalents and any prosecution history estoppel limiting it; invalidity under §§ 101, 102, 103, and 112, including whether the claims survive subject-matter eligibility; whether inter partes review is available and worth its estoppel cost; and damages exposure, including whether marking requirements were met.

Trade secret misappropriation. Assess whether the information is a genuine trade secret — not generally known, not readily ascertainable, with independent economic value, and subject to reasonable measures to keep it secret; whether there was misappropriation by improper means or breach of a duty; and whether the accused party can show independent development, which is a complete defense and which is proved by contemporaneous development records that either exist or do not.

Restrictive covenant enforcement. Assess enforceability under the governing state's law, whether that law is what the contract says it is, whether the covenant is reasonable in duration, geography, and scope, whether the employer has a protectable interest, whether the person actually breached, and what the employer can prove about damages.

Defamation. Assess whether the statement is one of fact rather than opinion, whether it is false, the plaintiff's status (public figures and public officials must prove actual malice), whether any privilege applies, and — critically — whether an anti-SLAPP statute applies, because a special motion to strike with mandatory fee-shifting changes the leverage completely.

Contract claims. Read the contract. Assess the alleged breach, any cure rights, notice requirements, limitation of liability, the dispute resolution clause, and the limitations period.

The sender

The merits are half the analysis. The other half is what the sender can and will actually do.

  • Who is the sender? A sophisticated competitor with a litigation history, a non-practicing entity monetizing a portfolio, an individual, or a company sending form letters at volume?
  • What is the letter's quality? A detailed letter with claim charts and specific factual allegations signals investment and intent. A form letter with no specifics frequently signals a portfolio-clearing exercise.
  • What are the economics? What does the sender recover if it wins, and what does litigation cost it? A claim with no statutory damages, no fee-shifting, and modest actual damages is expensive for the plaintiff to bring.
  • Is there a fee-shifting statute? The Lanham Act, the Copyright Act, the Patent Act, the DTSA, and many state statutes provide for fees in exceptional cases. This cuts both ways and materially changes settlement value.
  • What is the sender's real objective? A license, a name change, a competitor's exit from a market, leverage in another negotiation, or a settlement payment. Letters frequently demand more than the sender wants, and identifying the actual objective is what makes a resolution possible.
  • What is the relationship? Existing customer, supplier, partner, or former employee relationships change everything about the appropriate response.
  • Is there counter-leverage? Counterclaims, a claim of the recipient's own, an invalidity position, an unclean hands argument, or a business relationship the sender values.

The response options

Option one: no response. Rarely optimal, occasionally correct — for a transparent form letter from a serial sender with no apparent merit, or where any response would supply information the sender lacks. Understand the costs: it forfeits the chance to resolve the matter cheaply, it may support a willfulness argument, and it leaves the sender to choose the forum and the timing.

Option two: acknowledge and request information. A short letter from counsel confirming receipt, stating that the matter is under review, requesting the specific factual and legal basis (claim charts in a patent case, specimens and registration details in a trademark case, the identification of the copied work in a copyright case), and requesting an extension. This is the default first move. It costs almost nothing, it frequently reveals that the sender's position is weaker than the letter suggested, and it buys the time analysis requires.

Option three: a substantive response denying the claim. Appropriate where the position is strong and where a well-supported letter may end the matter. Content: a clear statement of the non-infringement or invalidity or defense position, with enough specificity to be credible and not so much as to educate; no admissions; a reservation of all rights and defenses; and a statement that the letter is not an admission and is protected as a settlement communication where applicable.

Option four: negotiate. Where the claim has merit or where resolution is cheaper than the fight. Possible resolutions: a license, a coexistence agreement with defined fields or territories, a phase-out period, a modification that eliminates the issue, a walk-away, or a payment. Consider a tolling agreement to remove the pressure of a running limitations period while negotiating, and a standstill agreement in which both sides agree not to file for a defined period — which prevents the negotiation from being a cover for a race to the courthouse.

Option five: file a declaratory judgment action. Discussed below.

Option six: comply. Sometimes the right answer. If the claim is meritorious and compliance is cheap — changing a tagline, removing an image, renaming a feature — do it, negotiate a release, and move on. A great deal of money is spent litigating positions that were not worth defending.

The declaratory judgment decision

The advantage is forum. A recipient who files first generally chooses the district, and in intellectual property matters the differences among districts in speed, claim construction practice, jury pools, and local rules are substantial. It also converts the recipient from defendant to plaintiff, which matters for trial presentation and for settlement dynamics.

Jurisdiction. Under the Declaratory Judgment Act, 28 U.S.C. § 2201, a court may declare rights where an actual controversy exists. MedImmune, Inc. v. Genentech, Inc., 549 U.S. 118 (2007), replaced the older "reasonable apprehension of imminent suit" test with the general standard: whether, under all the circumstances, there is a substantial controversy between parties with adverse legal interests, of sufficient immediacy and reality to warrant relief.

What creates a controversy, in practice: a letter identifying specific patents and specific accused products; a demand for a license backed by an assertion of infringement; prior litigation between the parties; and communications to the recipient's customers. What generally does not: a vague letter identifying no specific rights or products, or a general invitation to discuss a license without an infringement assertion.

Sophisticated senders draft to avoid creating jurisdiction — mentioning patents without accusing products, or offering a license without alleging infringement — precisely so the recipient cannot file first. Read the letter with that in mind.

Considerations against filing:

  • Cost. A declaratory judgment action is a lawsuit, and it starts one that might never have been filed.
  • The first-to-file rule is discretionary. Courts may decline to hear an anticipatory declaratory action filed during negotiations, particularly where the recipient filed while representing that it was considering a settlement proposal. Courts dislike being used to defeat a good-faith negotiation.
  • Compulsory counterclaims will follow, so the merits are joined regardless.
  • The relationship may be destroyed by filing, which matters where the parties have one.

The race to the courthouse is real, and it is why a standstill agreement is worth proposing before substantive negotiations begin. Where no standstill exists, a party that intends to file should prepare the complaint before making its final settlement proposal.

Drafting the response

Send it from counsel, on firm letterhead. It signals that the matter is being handled, and it keeps the client's words out of the record.

Structure:

  1. Acknowledge receipt and identify the client.
  2. State that the client takes the matter seriously and has reviewed it — without describing the review in a way that implicates privilege.
  3. Deny the claim, specifically enough to be credible.
  4. Set out the position — the strongest one or two points, not every argument. A letter listing eleven defenses reads as weakness; one that says "claim 1 requires element X, and the accused product has no element X" reads as strength.
  5. Request whatever is needed — claim charts, specimens, the specific works, the specific confidential information alleged to have been taken.
  6. Reserve all rights and defenses, and state that the letter is not exhaustive.
  7. Mark it appropriately — "For Settlement Purposes Only" and, where applicable, a reference to Federal Rule of Evidence 408 and its state analogue, recognizing that the label does not by itself make a communication inadmissible.
  8. Where a resolution is desired, say so — in a way that does not concede liability.

What not to include:

  • Detailed technical or factual descriptions of the accused product or conduct, which will be used against the client.
  • Any admission, including inadvertent ones. "We have discontinued that practice" reads as a concession.
  • Legal conclusions the client cannot support.
  • Any reference to an opinion of counsel unless the client has decided to rely on it and accept the waiver.
  • Threats the client will not carry out. A letter promising to sue by a date, followed by silence, is a credibility loss that is felt for the rest of the matter.
  • Personal attacks or intemperate language. The letter will be an exhibit, and judges read tone.
  • Anything the client would not want read aloud in court.

The recurring scenarios

Trademark from a larger company. Frequently negotiable. Options include a coexistence agreement, a geographic or field-of-use limitation, a phase-out period with a transition allowance, or a small payment for a name change. Larger companies often want certainty rather than money, and a well-drafted coexistence agreement gives both sides more than litigation would. Assess priority carefully — a smaller company with earlier use in a territory has real leverage.

Copyright / DMCA takedown. A takedown under 17 U.S.C. § 512 is a different mechanism, addressed to the platform rather than to the user. The recipient may file a counter-notification under § 512(g), which requires a statement under penalty of perjury and consent to the jurisdiction of a federal court — and which obligates the platform to restore the material in ten to fourteen business days unless the claimant files suit. Assess fair use before counter-notifying, and note that § 512(f) provides a remedy against knowing material misrepresentations in a takedown notice.

Patent assertion by a non-practicing entity. Assess the portfolio, the claim charts, and the entity's litigation history. Options: inter partes review at the Patent Trial and Appeal Board, which is faster and cheaper than district court litigation but carries estoppel; a declaratory judgment action; joining a defensive aggregator or a joint defense group with other targets, which distributes cost; or a license, which for a low demand is frequently the rational answer even where the patent is weak.

Former employee / non-compete. Assess enforceability under the governing law and whether that law is what the agreement says. Consider whether the employee actually breached, whether the new employer has exposure for tortious interference, and whether a negotiated resolution — a limited customer carve-out, a shortened period, a confidentiality reaffirmation — resolves it. Preserve the employee's devices and communications immediately; these cases are decided on forensics.

Defamation. Assess anti-SLAPP applicability first, because in an anti-SLAPP jurisdiction a meritless claim is expensive for the claimant. Consider whether a correction or clarification resolves it, and remember that a retraction demand may be a statutory prerequisite to certain damages in some states.

Debt collection or contract demand. Verify the debt, check the limitations period, review the contract's notice and cure provisions, assess offsets and counterclaims, and — where the sender is a debt collector and the debtor is an individual — consider the Fair Debt Collection Practices Act.

A short case study

A 40-person consumer brand receives a letter from a national company alleging that its product name and packaging infringe a registered trademark and trade dress. It demands immediate cessation, destruction of inventory, an accounting, and $250,000.

Day 1. Litigation hold. The letter goes to outside counsel and to three internal people. No one contacts the sender.

Day 2. Counsel acknowledges receipt, requests the registration details, specimens showing the sender's use, and the basis for the trade dress claim, and asks for 30 days.

Days 3–20. Analysis. The sender's registration covers a related but distinct class. A search establishes that the client's first use predates the sender's expansion into the client's category by fourteen months in three states. The marks are similar but not identical; the goods are adjacent; the channels differ; and there is no evidence of actual confusion in two years of coexistence. The trade dress claim is weak — the packaging elements are largely functional and widely used.

Insurance. Tendered under the advertising injury coverage of the CGL policy. The carrier accepts the defense under a reservation of rights, which changes the economics substantially.

Day 24. Counsel responds: a specific non-infringement position, priority evidence in the three states, an observation that the trade dress elements are functional and common, a reservation of rights, and an invitation to discuss a coexistence arrangement.

Days 30–75. Negotiation. The parties execute a coexistence agreement: the client may use its name in its existing categories and channels; it adopts a modified packaging color palette on a nine-month transition; each party agrees not to challenge the other's registrations in defined classes; and there is no payment.

Total cost: roughly what one month of litigation would have been, most of it covered by insurance. The determining moves: not calling the sender, tendering to the carrier, and establishing priority before saying anything substantive.

Conclusion

Three points carry the weight.

The first forty-eight hours are about preservation and restraint. A litigation hold, no direct contact, no immediate substantive response, and a tender to insurers. Everything after that is recoverable; a spoliation finding and an unguarded admission are not.

Evaluate the sender as carefully as the claim. Merits determine who should win; economics, fee-shifting, forum, and the sender's actual objective determine what will happen. Many letters with real merit are worth resolving cheaply, and many letters with none are worth taking seriously because the sender can afford to be wrong for two years.

Filing first buys the forum, and the door is not always open. MedImmune made declaratory jurisdiction easier to establish, and sophisticated senders now draft around it. Where the option exists and the case is likely, the forum choice is frequently worth more than any argument made in a response letter.

Frequently asked questions

Do I have to respond? No legal obligation exists in most cases. But silence forfeits the chance to resolve the matter cheaply, may support a willfulness claim, and leaves the sender in control of timing and forum. A short acknowledgment from counsel is nearly always worth sending.

Should I stop what I am doing? It depends on the strength of the claim and the cost of stopping. Continuing after notice supports enhanced damages in patent and trademark cases and strengthens an injunction motion. Stopping may look like an admission and may be expensive. The frequent middle course is to change what is clearly problematic while documenting a good-faith basis for the rest.

Can I just call them? Do not. Client-to-client calls produce admissions, waive positions, and are described in later declarations in ways the participants do not recognize. If a business conversation would help, have counsel set it up with ground rules.

Will marking the letter "confidential settlement communication" keep it out of evidence? Not by itself. Federal Rule of Evidence 408 excludes settlement communications when offered to prove liability or amount, but not for other purposes — and courts routinely admit demand letters and responses to show notice, knowledge, and willfulness, which is precisely what makes them dangerous.

Does receiving a letter mean I will be sued? No. A large share of demand letters never produce litigation. But the ones that do usually give no further warning.

Should we get an opinion of counsel? In patent matters, a competent non-infringement or invalidity opinion can rebut willfulness — but relying on it waives privilege as to the subject matter, and the waiver is broad. Obtain the opinion if the exposure justifies it, and decide about reliance separately and deliberately.

How much will this cost? An acknowledgment and an initial analysis is usually a few thousand dollars. A substantive analysis with a considered response runs higher. Litigation is an order of magnitude beyond that in most categories, and two orders in patent cases. That asymmetry is why most of these matters should be resolved rather than fought, and why the analysis is worth doing well.

What if the letter goes to our customers instead of us? That is a materially different problem. Communications to customers may support a tortious interference or Lanham Act false advertising claim if the assertions are false and made in bad faith, and they usually create declaratory judgment jurisdiction. It also requires an immediate customer communication plan, prepared with counsel, so that the response is consistent and does not itself create liability.

What if we think the claim is frivolous? Fee-shifting statutes, Rule 11, and anti-SLAPP statutes exist, and in the right case they change the leverage entirely. But "frivolous" is a legal standard rather than a description of how annoying the letter is, and the analysis should be done before threatening it.

If you are the one sending the letter

The analysis runs in reverse, and senders make predictable mistakes.

Decide the objective first. A license, a name change, a payment, an exit from a market, or simply a record of notice. The letter should be drafted to achieve that objective, and demands that exceed it — destruction of inventory, a public apology, an accounting going back six years — reduce the chance of resolution and make the sender look unserious.

Decide whether you want a declaratory judgment action. If not, draft to avoid creating jurisdiction: identify the rights without accusing specific products, or open a licensing discussion without an infringement assertion. If you are prepared to litigate and want to be the plaintiff, prepare the complaint before sending anything.

Investigate before asserting. Rule 11 and its state analogues require a reasonable inquiry, fee-shifting statutes punish exceptional cases, and a letter asserting a patent without a claim chart or a trademark without checking priority invites an invalidity or cancellation counterclaim. In the trademark context, an overreaching demand also produces reputational consequences that circulate quickly.

Be careful about third parties. Letters to the recipient's customers, distributors, app stores, or payment processors are effective and dangerous. They create declaratory judgment jurisdiction, and if the assertions are false or made in bad faith they support tortious interference and false advertising claims. Several states additionally regulate bad-faith patent assertion letters by statute, with attorney general enforcement.

Set a realistic deadline. Seven days signals that the sender has not thought about how a company processes a legal demand. Thirty days is credible and is granted anyway.

Say what you want. The most effective letters state the problem, the basis, and a specific proposed resolution. Letters that demand everything and propose nothing produce a denial and a stalemate.

And preserve your own evidence. The sender's litigation hold obligation attaches at the same moment the recipient's does.

A short intake checklist

For the lawyer receiving the file, or the business person triaging it, work through these before doing anything else.

Immediate, same day. Litigation hold issued and auto-deletion suspended. Letter routed to counsel and a small internal group with an instruction not to discuss it by email. Any deadline in the letter calendared, with an extension request prepared. Insurers identified for tender. Any contract between the parties located and checked for a forum, arbitration, notice, or cure provision.

Within a week. The sender researched — litigation history, size, counsel, and whether this letter is one of many. The asserted rights verified independently: registrations pulled, patents downloaded, the copyrighted work identified, the covenant read. The client's own conduct documented: what the product does, when it launched, who developed it, and what records exist about the development. Priority and independent-development evidence preserved, because both are complete defenses that depend entirely on contemporaneous records.

Within thirty days. A written merits assessment. An economic assessment of the sender's incentives and of the client's exposure, including fee-shifting. A forum analysis, including whether declaratory jurisdiction exists. A recommendation with an estimated cost for each path — respond and deny, negotiate, file, or comply.

Then a decision by a person with authority, documented. The failures described throughout this guide are rarely failures of legal analysis. They are failures to decide, which leave the matter to drift until the sender decides instead.

One further point about tone. A demand letter arrives as an accusation, and the instinctive response — from founders especially — is indignation. That instinct produces the four-page letter described at the start of this guide, and it produces business decisions made to win an argument rather than to protect the company. The most useful thing counsel does in the first week is often not legal analysis at all; it is separating the question of whether the sender is being unreasonable from the question of what the client should do about it. Those are different questions, and only the second one matters.

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This guide is provided for general informational purposes and does not constitute legal advice. The evaluation of any demand depends on the specific claim, the governing law, and the forum, and deadlines in some contexts are short. Consult qualified counsel promptly on receipt of a demand letter.