Practical Answer — CAD / Samples / Supplier Disclosure
What Should Be Protected Before Sending CAD Files or Samples to a Chinese Manufacturer?
By Peter Lin, Founder, China IP Gateway · July 2026
This page is informational guidance, not formal legal advice.
In short
Before sending product files, samples, or brand materials to a Chinese manufacturer, the key protections are: a signed China-focused NNN agreement, verification of the Chinese legal entity, confirmation of who receives files and under what restrictions, and — for brands — consideration of China trademark filing before packaging or branding materials are exposed. The category of material determines which protection layer matters most.
What counts as sensitive product material
"Sensitive" is not limited to top-secret files. In the China supply chain context, sensitive material is anything a Chinese manufacturer could use to copy your product, approach your customers, or file IP in their own name. This includes more than most buyers initially expect:
| Material type | Why it is sensitive |
|---|---|
| CAD / STP / STEP / STL files | Complete product geometry — can be used to manufacture identical products |
| Technical drawings and dimensions | Manufacturing instructions — reveals tolerances, assembly, and specifications |
| BOM (bill of materials) | Component list and sourcing data — reveals cost structure and supply chain |
| Physical samples and prototypes | Reveals product structure, materials, and design without files |
| Packaging artwork and brand files | Trademark exposure — can lead to brand squatting or unauthorized brand use |
| Product photos not yet public | Design documentation — can support a supplier's own IP filing |
| Tech packs and manufacturing notes | Production instructions that could enable a competing product |
| Launch plan, pricing, and customer list | Non-circumvention risk — allows bypassing the buyer to approach customers |
CAD files, drawings, STP files, and BOMs
These are the highest-risk files to share without protection in place. Once a factory has your product geometry, they have everything they need to manufacture your product independently — with or without your involvement. Before sharing:
Samples, prototypes, packaging, and product photos
Physical samples and prototypes reveal product structure without any digital file. Packaging reveals brand identity and design. Product photos may be used in factory listings. Before sharing:
Samples and prototypes
NNN in place before samples are shared; NNN should cover non-use of the sample-based product knowledge
Pre-production packaging artwork
Brand trademark filing should be considered before final packaging is shared with manufacturer or packaging vendor
Product photographs not yet public
Display restrictions should prohibit factory from using your photos in their Alibaba or platform listings
Trade show samples
Mark samples clearly and limit what can be photographed or kept; NNN timing matters before and after trade shows
Brand names, logos, and China trademark exposure
China uses a first-to-file trademark system. Once a brand name or logo is visible to a Chinese manufacturer, distributor, or packaging supplier, anyone who sees it can file that name at CNIPA before you do. Contractual restrictions (NNN, manufacturing agreement) help with the specific supplier — but they do not prevent a third party from independently filing a mark they have seen.
Filing your China trademark before meaningful factory or supplier disclosure reduces the risk of bad-faith third-party filing. This is separate from and should run in parallel to your NNN and manufacturing agreements.
Supplier identity and legal entity control
The NNN agreement, manufacturing agreement, and any related protections are only as strong as the entity they bind. Before files go anywhere:
What agreement or filing may be needed before disclosure
| If you are sharing... | Before sharing, consider... |
|---|---|
| CAD / STP / drawings / BOM | China NNN agreement (non-use, non-circumvention) |
| Product samples or prototypes | China NNN agreement + display restriction |
| Brand packaging or logo files | China trademark filing + NNN agreement |
| Launch plan, pricing, customer list | China NNN with non-circumvention + customer list clause |
| Full product spec for production | Manufacturing agreement (OEM/NNN) + tooling terms |
What not to send too early
How China IP Gateway can help
China IP Gateway can help overseas product companies review what protections should be in place before the next file, sample, or brand material is shared with a Chinese manufacturer — including NNN structure, Chinese legal entity verification, trademark filing timing, and supplier-control review. A Supplier Control Review can map what is currently in place and what may be missing before disclosure deepens.
Outcomes depend on the facts and supplier situation. No result is guaranteed.
Frequently Asked Questions
Does an NNN agreement need to be signed before I send CAD files to a Chinese manufacturer?
In most cases, yes — before sharing detailed product files, drawings, technical specifications, or samples. An NNN agreement addresses non-disclosure, non-use, and non-circumvention. The risk is not only leakage: a factory with your design files and no agreement may use them for other buyers, file IP registrations, or share them with affiliates. The right time to have the agreement in place is before the files leave your control, not after.
Do I need to file a China trademark before sharing product packaging with a manufacturer?
For most overseas brands, yes. Once your brand name, logo, or packaging artwork is visible to a Chinese manufacturer, distributor, or packaging supplier, the risk of third-party trademark filing at CNIPA increases. Filing before sharing brand-visible packaging or branding materials reduces this risk. The exact timing depends on your stage and disclosure plan.
What if I already sent CAD files before signing any agreement?
You should preserve evidence, identify the actual Chinese legal entity, limit further disclosure, and review whether a retroactive NNN or manufacturing agreement, trademark filing, or supplier-control action is still appropriate. Sending files without a prior agreement is common — it does not mean the situation cannot be structured properly going forward.
Do samples count as sensitive product material that needs protection?
Yes. Physical samples reveal product structure, dimensions, materials, component combinations, and design details that a factory can reverse-engineer, copy, or show to other buyers. Samples should be shared under an NNN agreement that covers non-use and non-circumvention — and display restrictions should be clear before samples are shared with a factory or shown at trade shows.
What is the minimum I should have in place before sharing product files with a Chinese manufacturer?
At minimum: confirm the correct Chinese legal entity (verified against their business license), have a signed China-focused NNN agreement covering non-disclosure, non-use, and non-circumvention, and limit the files to only what is actually needed for the current stage. For brands with packaging or logos, a China trademark filing should also be considered before files containing branding are shared.
Written by
Peter Lin
Founder & China Supplier Control Lead, China IP Gateway
Peter Lin works with overseas product companies on China NNN agreements, pre-disclosure control, China trademark timing, and supplier-control review before production engagement.
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