NDA en IP-bescherming voor spuitgieten in China: wat echt werkt

You designed a part for eight months. You found a factory in China that quotes 40% less than your local tooling shop. But before you hit “send” on that CAD file, your legal team asks one question that stops everything: “What happens if they copy it?”

That question is the right one. China’s IP landscape has improved significantly since the early 2000s, but the gap between “what the law says” and “what actually happens when your mold design shows up on Alibaba” is still wide enough to lose sleep over. This article walks through the NDA and IP protection framework that actually works — not the theoretical version, but the one we have seen hold up (and fail) in practice over 20+ years of running injection molds in Shanghai.

Why Does IP Protection Matter When Outsourcing Injection Molding to China?

IP protection is essential when outsourcing injection molding to China because low cost and high capability increase design exposure risk. China accounts for roughly 35% of global plastic production, and filing an infringement lawsuit in China costs $15,000–$50,000 and takes 12–18 months, during which a rogue factory can produce tens of thousands of counterfeit parts.

Here is the uncomfortable math. If a factory produces 50,000 counterfeit parts during that window at $2 each, you are already out $100,000 in lost revenue before the court rules. Prevention is not just cheaper — it is the only rational strategy.

The three most common IP risks in spuitgieten outsourcing are:

Design leakage: Your CAD files get shared with a competitor or used to produce unlicensed copies.

Mold duplication: The factory makes a second, identical mold and runs unauthorized production on night shifts.

Tooling hostage situations: You paid for the mold, but the factory claims ownership and refuses to ship it or release the design.

Each of these has a different legal remedy, but they all share one root cause: inadequate upfront protection. The rest of this article covers exactly what to put in place before you send your first file.

What Should an Injection Molding NDA Actually Cover?

An injection molding NDA is a manufacturing-specific contract that controls CAD files, mold ownership, permitted use, and governing law. Generic software or consulting NDAs fail in manufacturing because physical assets like molds and tooling are involved.

The five critical clauses:

Clause	What It Covers	Common Mistake
Definition of Confidential Information	CAD files, mold designs, material specs, process parameters, BOM	Too vague — “all technical information” is unenforceable in Chinese courts
Purpose Limitation	Supplier can only use files for producing your parts	Omitting this lets the factory claim “independent development”
Mold Ownership	You own all molds, inserts, and tooling paid by you	Not specifying this is the #1 cause of tooling disputes
Return/Destruction	Supplier must delete digital files and return physical molds on termination	Forgetting to include digital file deletion
Governing Law & Jurisdiction	Chinese law, local court (or CIETAC arbitration)	Choosing US/EU law — unenforceable without reciprocal treaty

Two details that trip up most companies: First, the NDA must be bilingual (Chinese and English), and in case of conflict, the Chinese version governs. Second, the agreement must name specific individuals at the factory who are authorized to access your files — a blanket “our team” clause will not hold up.

How Do Chinese IP Laws Protect Your Mold Designs?

Chinese IP law is a three-layer system: CNIPA² design patents, trade secret protection, and contract enforcement through IP courts. You need all three layers because each one protects a different part of the mold design, file-sharing, and supplier-control process.

Design Patents

China operates a “first-to-file” system, meaning the first entity to file a design patent application owns the right — regardless of who created the design. If your factory files a design patent on your part before you do, they legally own it. Filing a design patent in China through CNIPA costs approximately $500–$1,500 and takes 3–6 months to grant. You should file before sharing any files with suppliers.

Trade Secret Protection

China’s Anti-Unfair Competition Law³ protects trade secrets, including manufacturing processes and technical data. However, the burden of proof is on you to demonstrate: (1) the information was secret, (2) it had commercial value, and (3) you took reasonable steps to protect it. That third element is where most companies fail — without an NDA, access logs, and file encryption, courts will rule that you did not take “reasonable steps.”

Contract Enforcement

Chinese courts enforce well-drafted contracts, including NDAs and mold ownership agreements. The key is specificity. A clause that says “supplier shall not disclose confidential information” is weaker than one that says “supplier shall not reproduce, share, or use CAD files numbered [X] for any purpose other than producing [Part Name] under Purchase Order [Y].”

One practical note: foreign companies often assume Chinese courts are biased. In IP cases, this is increasingly inaccurate. China’s specialized IP courts (established in Beijing, Shanghai, Guangzhou, and Shenzhen since 2014) have a reputation for competent, technically informed rulings. The real challenge is not bias — it is speed and evidence.

When Should You Sign an NDA in the Mold Tooling Process?

The right time to sign an NDA is before you share any technical files. Do not wait until after the first quote, during DFM review, or “when things get serious,” because by then the factory already has enough detail to reproduce your part.

Here is the realistic timeline for when IP protection steps should happen:

Stage	What to Share	IP Protection Required
Initial inquiry	Part material, general dimensions, estimated volume	Basic NDA signed
Quotation	2D drawings, critical dimensions, tolerances	NDA + file watermarking
DFM review	Full 3D CAD, mold flow analysis requests	NDA + design patent filed
Tooling kickoff	Complete CAD, mold design approval	NDA + mold ownership agreement + patent
Productie	Process parameters, inspection criteria	All above + access logs

The biggest mistake we see: companies send complete STEP files for quotation before any legal protection is in place. A STEP file contains everything a competent spuitgietvorm designer needs to replicate your part. Share PDF drawings for initial quotes — save the 3D files for after the NDA is countersigned.

What Are the Most Common IP Risks in China Injection Molding?

The most common ip risks in china injection molding are the main categories or options explained in this section. The three most common IP risks are unauthorized mold duplication (night-shift copies), “improvement” patent claims (factory files patents on minor modifications), and unapproved subcontracting (your files end up at a factory you never vetted) — all of which are preventable with the right contract clauses.

Risk 1: The Unauthorized Second Mold. A factory produces your parts during the day on Mold A (the one you paid for). At night, they run an identical Mold B on a different machine, selling parts through a trading company on Alibaba. You discover it when a competitor starts selling your part at 60% of your price. Prevention: include a clause that grants you the right to inspect the factory’s production records and mold inventory at any time.

Risk 2: The “Improvement” Claim. The factory makes a small modification to your mold design — a different gate location, adjusted cooling — and then claims the improved version is their own intellectual property. Under Chinese patent law, an “improvement” patent can be filed by anyone who makes a non-obvious technical contribution. Prevention: your NDA should explicitly state that all derivatives, modifications, and improvements of your design remain your property.

Risk 3: Subcontracting Without Consent. Your contract is with Factory A, but they subcontract the actual injection molding process to Factory B — without telling you. Factory B now has your design files and no contractual relationship with you. Prevention: prohibit subcontracting in your agreement, or require written consent and extend NDA coverage to subcontractors.

How Can You Verify a Factory’s IP Protection Track Record?

A factory’s IP track record is verified through audits, customer references, security checks, NDA process evidence, and court records. Asking “do you protect IP?” will always yield a “yes,” so buyers need concrete proof before sharing sensitive files.

1. Export Certifications. Factories that hold ISO 13485 or IATF 16949 (automotive) certifications have already passed third-party audits for document control and traceability. These audits are not about IP specifically, but a factory that cannot control its documents cannot protect your IP.

2. Customer References from IP-Sensitive Industries. If a factory supplies medical device companies or automotive OEMs, it has already been vetted by compliance teams who take IP protection seriously. Ask for references from customers in these sectors — not just consumer goods companies.

3. Physical Security. Visit the factory (or request a video tour). Check whether the mold storage area is accessible to all employees or restricted. Ask how digital files are stored — shared network drives accessible to everyone is a red flag; a PLM or PDM system with role-based access is a green flag.

4. Existing NDAs with Other Customers. A factory that routinely signs NDAs with Western customers will have a standard process, a legal contact, and actual experience with the mechanics of confidentiality. A factory that has never signed one is a higher risk.

5. Court Record Check. Search China Judgements Online (wenshu.court.gov.cn) for the factory’s company name. Any prior IP disputes are public record. This takes 15 minutes and can save you months of headaches.

For a structured approach to supplier evaluation, our injection molding supplier sourcing guide covers 12 verification points including IP protection, financial stability, and production capabilities.

What Should a Mold Ownership Agreement Include?

A mold ownership agreement is the document that proves who owns the aangepaste spuitgietmatrijs, inserts, spare parts, and design files. Without it, ownership can default to the entity that designed the mold, even if you paid for the steel and machining.

A mold ownership agreement must cover:

Clear title: “All molds, inserts, cores, cavities, and associated tooling produced for [Customer] under Purchase Order [X] are the sole property of [Customer].”

Transfer of possession: When and how the mold will be returned to you (or transferred to another supplier).

Maintenance responsibility: Who pays for mold maintenance, and what standard applies.

Storage terms: How the mold is stored when not in production, and insurance requirements.

Right to audit: Your right to inspect the mold’s physical condition and production logs at any time.

One clause that many companies miss: what happens to the mold if the factory goes bankrupt? Under Chinese bankruptcy law, molds owned by a customer (not the factory) are not considered factory assets and should be returned. But proving ownership without a written agreement is extremely difficult after the factory’s doors are locked.

Practical Checklist: 8 Steps to Protect Your IP Before Sending CAD Files

Here is the sequence we recommend to every new customer, distilled from 20+ years of experience and the mistakes we have watched others make:

File a Chinese design patent before sharing files with anyone. Cost: $500–$1,500. Timeline: file today, protection starts from filing date.

Sign a bilingual NNN agreement (Chinese governing) that covers CAD files, mold designs, process parameters, and BOM. Name specific authorized personnel.

Sign a mold ownership agreement that explicitly states you own all tooling paid by you, including molds, inserts, and spare parts.

Watermark all technical documents with your company name, date, and “Confidential — for quotation only.”

Share PDF drawings first, not native 3D files. Save STEP/IGES files for after the NDA is countersigned.

Verify the factory’s credentials: ISO certifications, customer references, court record check.

Include an audit clause giving you the right to inspect production records and mold inventory.

Use encrypted file transfer (not email attachments) for sensitive CAD data.

None of these steps is optional. Skipping any one of them creates a gap that a bad actor can exploit — and has.

FAQ

Is a Chinese NDA enforceable in Chinese courts?

Yes. Chinese courts enforce properly drafted NDAs, especially when the agreement is in Chinese, specifies damages, and includes clear definitions of confidential information. Bilateral NDAs are more enforceable than unilateral ones because both parties have obligations.

Should I use an NNN agreement instead of a standard NDA?

NNN (Non-Disclosure, Non-Use, Non-Circumvention) agreements are stronger for manufacturing in China because they explicitly prohibit the supplier from using your information to compete with you or to circumvent your business relationships. For injection molding projects, an NNN agreement is preferred over a basic NDA.

Can I register a design patent in China as a foreign company?

Yes. Foreign entities can file design patent applications through CNIPA, typically via a local patent attorney. First-to-file means you should register before any disclosure, including to potential suppliers.

What happens if a Chinese factory copies my mold design?

You can file a design patent infringement lawsuit in a specialized IP court. Damages in China increased significantly after 2021 amendments — statutory damages now range from ¥10,000 to ¥5,000,000 ($1,400–$700,000), with punitive damages up to 5x for willful infringement.

Do I need separate NDAs for each injection molding project?

One master NDA covers multiple projects with the same supplier, but each project should have its own purchase order or statement of work referencing the master NDA. This keeps the legal framework simple while maintaining project-specific documentation.

How do I prevent unauthorized mold duplication?

Include a clause granting unannounced inspection rights, require the factory to maintain a mold inventory log, and mark molds with unique serial numbers documented in your ownership agreement. Physical verification during factory visits is the most effective deterrent.

What governing law should my NDA use for a Chinese supplier?

Chinese law, with disputes resolved in Chinese courts or through CIETAC arbitration. Choosing US or EU law sounds protective but is practically unenforceable — Chinese courts will not apply foreign law to a domestic manufacturing dispute.

How long does IP protection last for injection mold designs in China?

Design patents in China last 15 years from the filing date (updated from 10 years in 2021). Trade secret protection under the Anti-Unfair Competition Law has no expiration, provided you maintain secrecy measures. Contract-based protection lasts for the term specified in the agreement.

What is the difference between an NDA and an NNN agreement for manufacturing?

An NDA covers only non-disclosure (keeping information secret), while an NNN adds non-use (supplier cannot use your information for their own benefit) and non-circumvention (supplier cannot bypass you to deal directly with your customers). For manufacturing in China, NNN agreements provide significantly stronger protection.

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1. CIETAC: refers to the China International Economic and Trade Arbitration Commission, a dispute forum often named in cross-border manufacturing contracts involving Chinese suppliers. ↩

2. CNIPA: CNIPA refers to is the China National Intellectual Property Administration, the authority that reviews and grants Chinese design patent applications. ↩

3. Anti-Unfair Competition Law: is a Chinese law that defines trade secret misappropriation and provides remedies when confidential technical information is used without authorization. ↩