How to outsource CAD drafting without losing control of your IP

Outsourcing CAD work worries most engineering managers for one reason: the drawings are the company. Lose control of them and you lose the product, the supplier base and sometimes the customer. The fix is not to avoid outsourcing; it is to set up the work so that what leaves your company is limited, tracked and owned by you.

This is the setup we recommend to clients, and the one we ask them to hold us to.

What are you actually protecting?

Before choosing tools or contracts, separate three kinds of value in your files:

What	Where it lives	Typical risk
Geometry	STEP, IGES, PDF drawings	Someone builds the part without you
Design intent	Native models: feature tree, equations, configurations, design tables	Someone understands why it works and improves on it
System knowledge	Assemblies, BOMs, specifications, test data	Someone copies the whole product

A drafter detailing one bracket needs geometry and the drawing standard. They rarely need the design table that drives fifty variants, and they almost never need the top-level assembly. Match what you send to what the job needs.

Step 1: NDA first, files second

Sign the non-disclosure agreement before the first file is shared, including the “just a quick look” file sent to get a quote. A useful NDA for engineering work states:

• what counts as confidential (all files and information shared, marked or not);
• what the supplier may do with it (only the work you request);
• that files are returned or deleted at the end of the project, on request;
• that the obligation survives the end of the engagement;
• which law and courts apply.

Use your own template if you have one. A supplier who refuses to sign a reasonable NDA has answered your question.

In the US, the Defend Trade Secrets Act gives a federal civil remedy for misappropriation of trade secrets, and in the EU, Directive 2016/943 sets a common floor for trade secret protection. Both depend on you having taken reasonable steps to keep the information secret, and an NDA plus limited sharing is exactly that kind of step.

Step 2: Share the part, not the product

Split the work into packages that make sense on their own: a weldment, a sub-assembly, a family of machined parts. For each package, send:

1. the models of the parts being drafted;
2. the mating geometry they need, simplified if possible (a STEP envelope of the neighboring part instead of the full assembly);
3. your drawing template, standard and a sample of a drawing you consider correct;
4. a short brief: what the part does, critical features, material and finish.

Do not send the full product assembly “for context”. If context is needed, a screenshot or a simplified envelope usually does the job.

Step 3: Native or neutral files?

Situation	Send	Why
Drafter only makes drawings from finished geometry	STEP + PDF of any existing drawings	Geometry only; no feature tree or design intent
Drafter must modify features, configurations or linked drawings	Native files of those parts only	Edits need the feature tree
Supplier quotes or checks a part	PDF drawing, STEP if they need to program it	Enough to quote
Long-term engineering support partner	Native files of the packages they own	Efficiency outweighs the extra exposure, under contract

Neutral formats are not encryption: a STEP file still contains the full shape. Their value is that they leave out how the part was designed, which is often the harder thing to reproduce.

Step 4: Control the channel

Prefer a channel you control and can revoke: a shared folder in your SharePoint, Box or Google Drive with access for named people, or a PDM check-out if the supplier works inside your vault. Avoid attachments scattered across personal email accounts. At the end of the project, remove access and ask for written confirmation that local copies were deleted.

Step 5: Own the deliverables and keep release authority

Two clauses matter more than any software:

1. Ownership. All deliverables, including native files and intermediate models, become your property on payment. The supplier keeps no license to reuse them.
2. Release authority. Your engineer approves every drawing before it goes to production or suppliers. The outside drafter prepares and checks; your company releases.

The second one is as much about quality as about IP: it keeps one person accountable for what the shop floor builds.

Step 6: Check export controls before anything leaves

If your parts are for defense, aerospace or some dual-use applications, the drawings themselves may be controlled. In the US, ITAR (22 CFR parts 120–130) and the Export Administration Regulations can require authorization before technical data is shared with foreign persons, including a drafting company abroad. In Europe, dual-use rules apply in a similar way.

This is not a paperwork detail: sending controlled data without authorization can be a violation by the company that sent it. If there is any doubt, ask your export compliance officer first. A good supplier will ask you this question before you send files.

What should the supplier tell you?

A good engineering supplier should be able to answer, in writing: where your files are stored, who has access to them, whether any subcontractor or freelancer is involved, how files are deleted at the end, and whether they use any AI tools on client data. If those answers are vague, treat that as information about how your files will be handled.

A checklist you can reuse

• NDA signed before the first file.
• Work package defined: which parts, which drawings, which standard.
• Only the needed files shared; neutral formats where geometry is enough.
• Access through a revocable channel, for named people.
• Ownership of deliverables written into the scope.
• Release approval kept by your engineer.
• Export control status of the data checked.
• Access removed and deletion confirmed at the end.

None of these steps slow the work down once they are a habit. What they give you is the ability to outsource the drafting hours without outsourcing the product.