Anticircumvention Risk Checklist: Technological Measures, Exceptions, Exemption Fit, Trafficking, and Documentation

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This checklist assesses and reduces Section 1201 exposure for either side, in the order the questions should be asked rather than the order the statute is written. It classifies the measure, tests whether a protected work actually sits behind it - the strongest and most under-argued defence - separates conduct from trafficking, and identifies the circuit, because the nexus split resolves most device cases before any exception is reached. It screens the seven permanent exceptions and explains why each requires something the client usually lacks, then reads the current triennial classes properly including the cycle check. It covers manufacturer-side design decisions and the authorized access path, the file a repairer or researcher must build in advance, Section 1202 screening with its double scienter requirement, and the parallel contract and computer-access claims that frequently outlast the anticircumvention count.

IP and Technology > Copyright | Checklist | Published 21 May 2025 - Updated 30 May 2026 | Casey Scott McKay - marksy.us

Summary. This checklist assesses and reduces Section 1201 exposure for either side, in the order the questions should be asked rather than the order the statute is written. It classifies the measure, tests whether a protected work actually sits behind it — the strongest and most under-argued defence — separates conduct from trafficking, and identifies the circuit, because the nexus split resolves most device cases before any exception is reached. It screens the seven permanent exceptions and explains why each requires something the client usually lacks, then reads the current triennial classes properly including the cycle check. It covers manufacturer-side design decisions and the authorized access path, the file a repairer or researcher must build in advance, Section 1202 screening with its double scienter requirement, and the parallel contract and computer-access claims that frequently outlast the anticircumvention count.

Keywords: measure classification · protected work test · effectively controls access · conduct versus trafficking · circuit and nexus · statutory exception screening · reverse engineering scope · encryption research factors · security testing authorization · triennial cycle check · class language reading · exemption fit · repair program · authorized access path · lawful acquisition record · purpose statement · dissemination decisions · section 1202 screening · parallel claims · annual review


How to use this checklist

| Phase | What it covers | |---|---| | 1 | Classify the measure | | 2 | The protected work test | | 3 | Effectively controls access | | 4 | Conduct versus trafficking | | 5 | Circuit and the nexus split | | 6 | Authorization | | 7 | Reverse engineering scope | | 8 | Encryption research | | 9 | Security testing | | 10 | The other permanent exceptions | | 11 | Triennial cycle check | | 12 | Reading the class language | | 13 | The trafficking gap | | 14 | Manufacturer design decisions | | 15 | The authorized access path | | 16 | Repairer and researcher file | | 17 | Dissemination decisions | | 18 | Section 1202 screening | | 19 | Parallel claims | | 20 | Litigation posture | | 21 | Triennial participation | | 22 | Annual review |

Boxes marked [Gate] must clear before circumventing anything, or before an access control ships.

The matter. An independent repair shop bypassed diagnostic authentication on agricultural equipment. The shop's conduct was exempt under the current class; the tool vendor's trafficking was not, and no exemption reaches trafficking.


Phase 1. Classify the measure


Phase 2. The protected work test


Phase 3. Effectively controls access


Phase 4. Conduct versus trafficking


Phase 5. Circuit and the nexus split


Phase 6. Authorization


Phase 7. Reverse engineering scope


Phase 8. Encryption research


Phase 9. Security testing


Phase 10. The other permanent exceptions


Phase 11. Triennial cycle check


Phase 12. Reading the class language


Phase 13. The trafficking gap


Phase 14. Manufacturer design decisions


Phase 15. The authorized access path


Phase 16. Repairer and researcher file


Phase 17. Dissemination decisions


Phase 18. Section 1202 screening


Phase 19. Parallel claims


Phase 20. Litigation posture


Phase 21. Triennial participation


Phase 22. Annual review

Outcome. The measure was classified as an access control gating engine control software. The defence's strongest point was whether the measure gated the software or merely a diagnostic function, which required an engineer and was never fully litigated. Filed in a Ninth Circuit district, so the nexus argument was unavailable under MDY. The reverse engineering exception was argued and was weak, because the purpose was repair rather than program-to-program interoperability. The current triennial class covering diagnosis, maintenance, and repair of lawfully acquired equipment fitted the shop's conduct on a full reading of the class language. The tool vendor had no exemption, because none reaches trafficking — the repair was lawful and the means of accomplishing it was not. What resolved the matter was the manufacturer's exposure under a state right-to-repair statute requiring diagnostic tools on fair terms, and the case settled with an authorized tool published at a fixed price.


Phase 23. The six-question triage

Run these in order and stop as soon as one resolves the matter. Most do not reach the exemptions.


Phase 24. Device-category boxes

Run the base checklist, then the boxes for the category, since available relief is category-specific.

Vehicles.

Medical devices.

Consumer electronics and appliances.

Video games and software preservation.

Agricultural and industrial equipment.

Accessibility.

Printers, cartridges, and consumables.

Streaming and content platforms.


Phase 25. Evidence request, written in advance

Assemble before acting, or issue on receipt of a claim.

Why this belongs here. Most of these are technical rather than legal records, they cannot be reconstructed after the fact, and the party who has them controls the narrative on the questions that actually decide these cases.


Phase 26. The ninety-day programme

For a client whose business depends on this analysis — a repair operation, a research group, an accessory maker, or a manufacturer deploying access controls.

What is deliberately deferred. Litigation-grade technical analysis of every measure. Prioritize by commercial significance, and accept that activities the client does not actually conduct do not need an opinion.


Phase 27. The standing memorandum

Two pages, refreshed annually, and it is the artifact a successor practitioner will need most.


Phase 28. Advising before the client acts

Most of this practice is advisory, and the conversation has a standard shape.


Phase 29. Four sentences worth saying


Phase 30. Quarterly and annual metrics

For a client operating a programme that depends on this analysis.


Phase 31. Where this fits in the wider practice


Key Authorities at a Glance

| Authority | Proposition | |---|---| | 17 U.S.C. § 1201(a)(1) | Circumventing an access control | | 17 U.S.C. § 1201(a)(2) | Trafficking in access circumvention | | 17 U.S.C. § 1201(b) | Trafficking in copy-control circumvention | | 17 U.S.C. § 1201(a)(1)(C) | Triennial rulemaking | | 17 U.S.C. § 1201(d) | Library and educational exception | | 17 U.S.C. § 1201(e) | Law enforcement | | 17 U.S.C. § 1201(f) | Reverse engineering | | 17 U.S.C. § 1201(g) | Encryption research | | 17 U.S.C. § 1201(h) | Minors and the internet | | 17 U.S.C. § 1201(i) | Personally identifying information | | 17 U.S.C. § 1201(j) | Security testing | | 17 U.S.C. § 1202 | Copyright management information | | 17 U.S.C. § 1203 | Civil remedies | | 17 U.S.C. § 1204 | Criminal penalties | | 17 U.S.C. § 107 | Fair use, not a circumvention defence | | 17 U.S.C. § 117 | Computer program copies | | 17 U.S.C. § 512 | The safe harbor, frequently conflated | | Universal City Studios v. Corley | Trafficking; information as a means | | Chamberlain Group v. Skylink Technologies | Nexus required | | Lexmark International v. Static Control | Effectively controls access, narrowed | | MDY Industries v. Blizzard Entertainment | No nexus under § 1201(a) | | Storage Technology v. Custom Hardware Engineering | Maintenance and § 117 | | Murphy v. Millennium Radio Group | CMI beyond metadata | | Stevens v. Corelogic | Double scienter | | Green v. Department of Justice | Constitutional challenge | | ProCD v. Zeidenberg | Contract survives preemption | | Bowers v. Baystate Technologies | Contractual reverse engineering ban | | 18 U.S.C. § 1030 | Parallel access statute | | 18 U.S.C. § 1836 | Trade secret alternative |


The five things people get wrong

Believing fair use excuses circumvention. 17 U.S.C. § 107 is a defence to infringement. Circumvention is a separate wrong, and the lawfulness of what follows does not make bypassing the lock lawful. Clients act on this misunderstanding, which is why correcting it belongs in the first meeting.

Starting at the exemptions. They are the hardest question and the least likely to help. Most matters resolve on whether a protected work sits behind the measure, whether the measure is an access control or a copy control, or which circuit the case is in.

Assuming an exemption covers the tool. Triennial exemptions reach only the conduct prohibition at 17 U.S.C. § 1201(a)(1). A client may lawfully circumvent while the vendor who supplied the means is liable under § 1201(a)(2) — the repair is lawful and the means is not.

Treating Section 1201(f) as a general reverse engineering right. It requires program-to-program interoperability, elements not previously readily available, and non-infringing underlying acts. Hardware compatibility, content access, and most repair fall outside it, and over-arguing it costs credibility the exemption analysis will need.

Reading a class summary instead of the class language. Exemptions are drafted narrowly because the Copyright Office grants what the evidentiary record supports, and the conditions on category, purpose, and eligible persons are the exemption. A client whose purpose is sympathetic but who falls outside the class has no defence at all.


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This document is general information about the law, not legal advice, and does not create an attorney-client relationship. Anticircumvention outcomes turn on the measure, the purpose, the circuit, and the current exemptions. Marksy is not a law firm.

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