Can a Korean Supplier Subcontract Production Without Your Permission?

Short Answer

It depends on the contract, the nature of the product, and the applicable law.

A Korean supplier does not automatically have unlimited authority to subcontract production to another company simply because it remains responsible for delivering the finished products.

If the contract is silent, the issue may become a dispute over contract interpretation, industry practice, the customer’s expectations, confidentiality obligations, technical-data protection, and whether the customer expressly or impliedly consented to subcontracting.

For foreign companies, the main risk is often not subcontracting itself, but the transfer of drawings, specifications, process know-how, confidential information, and quality control responsibility to an unknown third party.

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Why Does Unauthorized Subcontracting Become a Problem?

Foreign companies often choose a Korean manufacturer because of its technical capability, certifications, equipment, quality system, production capacity, or reputation.

If production is later outsourced without the customer’s knowledge, disputes may arise over:

• Product quality
• Delivery delays
• Confidential information
• Intellectual property
• Technical data
• Regulatory compliance
• Traceability
• Responsibility for defects

The issue is not simply whether the supplier used another factory. The more important questions are whether the customer agreed to it, whether technical information was properly protected, and whether the supplier remains fully responsible for the subcontractor’s conduct.

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Key Issues in Unauthorized Subcontracting

Issue 1: Does the Contract Permit or Restrict Subcontracting?

The first question is what the contract says.

A manufacturing agreement may provide that:

• Subcontracting is prohibited without prior written consent
• Only specified processes may be subcontracted
• Only approved subcontractors may be used
• Subcontracting is permitted if the supplier remains responsible
• The customer must be notified before any subcontractor is used

If the contract clearly requires prior written consent, unauthorized subcontracting may constitute a breach of contract.

If the contract is silent, the dispute may turn on the transaction structure, the nature of the work, the parties’ communications, and whether the customer can show that it relied on the specific supplier’s own facilities or expertise.

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Issue 2: Was There Express or Implied Consent?

Subcontracting disputes often involve arguments over consent.

A supplier may argue that the customer knew subcontractors were being used or that subcontracting was common in the industry.

The customer may argue that it selected the supplier specifically because of its own production capability, certifications, or quality controls.

In practice, implied consent may be disputed based on:

• The contract wording
• Negotiation history
• Factory audit records
• Supplier qualification documents
• Quality agreements
• Emails and meeting records
• Industry practice
• Prior course of dealing

If a foreign customer does not want subcontracting, the contract should say so clearly.

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Issue 3: Technical Data and Confidential Information

Unauthorized subcontracting becomes much more serious when technical information is shared with third parties.

This may include:

• Technical drawings
• Computer-aided design (CAD) files
• Product specifications
• Manufacturing instructions
• Process conditions
• Testing methods
• Quality-control data
• Source code or firmware
• Customer know-how

The contract should state whether the supplier may share such materials with subcontractors, under what conditions, and with what confidentiality protections.

If technical data is shared without proper restrictions, the dispute may involve not only breach of contract, but also confidentiality, trade secret, and unfair competition issues.

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Issue 4: Flow-Down Obligations

If subcontracting is allowed, the main supplier should be required to impose equivalent obligations on the subcontractor.

These are often called flow-down obligations.

They may include:

• Confidentiality obligations
• Restrictions on use of technical materials
• Return or destruction obligations
• Audit cooperation
• Quality-control requirements
• Compliance obligations
• IP protection
• Data security obligations

The customer should not have weaker protection simply because the supplier uses another company in the production chain.

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Issue 5: Quality Control and Traceability

Subcontracting can affect quality and traceability.

Foreign customers may need to know:

• Where the product is manufactured
• Which subcontractor performs each process
• Whether the subcontractor is qualified
• Whether certifications apply to the subcontractor
• Whether production records are maintained
• Whether defects can be traced to a specific batch or process

This is especially important for industries such as medical devices, automotive components, electronics, aerospace, pharmaceuticals, industrial equipment, and safety-related products.

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Issue 6: Who Remains Responsible?

A supplier should not be able to avoid responsibility by saying that the problem was caused by its subcontractor.

The contract should clearly state that the supplier remains fully responsible for:

• Delivery
• Product quality
• Defects
• Warranty obligations
• Regulatory compliance
• Confidentiality breaches
• IP misuse
• Subcontractor misconduct
• Failure to return or delete technical materials

This helps prevent the supplier from shifting responsibility to a third party with whom the customer has no direct contract.

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Issue 7: Are There Industry-Specific Legal Restrictions?

In some industries, subcontracting may be restricted by specific laws or regulations.

This is especially relevant where manufacturing is connected to construction, electrical work, fire-safety work, regulated equipment, medical devices, defense-related goods, or other regulated sectors.

Even if the contract appears to allow subcontracting, the parties should confirm whether any industry-specific approval, notification, certification, or compliance requirement applies.

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What Happens When the Manufacturing Relationship Ends?

If the manufacturing relationship ends, subcontractors may still hold sensitive materials.

These may include:

• Technical drawings
• Computer-aided design (CAD) files
• Tooling
• Molds
• Product specifications
• Manufacturing records
• Confidential information
• Quality-control data
• Source code or firmware
• Digital backups

The contract should require the supplier to ensure that subcontractors also return, delete, stop using, or destroy these materials where appropriate.

Otherwise, confidential information may remain within the supply chain long after the relationship has ended.

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Practical Drafting Tips

Foreign companies manufacturing in Korea should consider including clauses that address:

• Whether subcontracting is permitted
• Prior written consent requirements
• Approved subcontractor lists
• Notification before subcontractor changes
• Restrictions on sharing technical data
• Flow-down confidentiality obligations
• Flow-down IP protections
• Quality-control obligations
• Audit and inspection rights
• Traceability and production records
• Supplier responsibility for subcontractor conduct
• Return and deletion obligations after termination
• Industry-specific compliance requirements

These issues should be addressed before production begins, not after unauthorized subcontracting is discovered.

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Conclusion

A Korean supplier does not automatically have unrestricted authority to subcontract production without the customer’s permission.

If the contract is silent, the dispute may depend on contract interpretation, consent, industry practice, confidentiality obligations, technical-data protection, and the customer’s reliance on the specific supplier’s capabilities.

For foreign companies, the safest approach is to regulate subcontracting clearly in the manufacturing agreement, especially where subcontracting may expose technical drawings, CAD files, process know-how, confidential information, quality control, or regulated products to third parties.

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