Unreal Engine · Unreal Engine EULA · View original document ↗

Non-Compatible License Prohibition (GPL/LGPL Ban)

Medium severity Unique · 0 of 325 platforms
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This analysis describes what Unreal Engine's agreement states, permits, or reserves. It does not constitute a legal determination about enforceability. Regulatory applicability and practical outcomes may vary by jurisdiction, enforcement context, and individual circumstances. Read our methodology

ConductAtlas Analysis

Why it matters (compliance & governance perspective)

Many open-source libraries and tools commonly used in software development are GPL or LGPL licensed, meaning developers must carefully vet every third-party library they incorporate into Unreal Engine projects to avoid an inadvertent breach.

Consumer impact (what this means for users)

Developers and studios using Unreal Engine for commercial products may owe Epic either seat subscription fees or a 5% royalty on gross revenues above $1,000,000 per product, depending on how they use and distribute the engine. The agreement also prohibits using Unreal Engine or MetaHuman assets as training input for AI systems, which may affect studios exploring AI-assisted workflows. You can review the seat subscription exceptions in Section 6(b) to determine whether the personal, indie, educational, or non-commercial exemptions apply to your organization.

How other platforms handle this

Runway Medium

You may not use Runway's tools to create content that promotes, glorifies, or facilitates acts of terrorism, mass violence, or genocide, or that could be used to provide material support to individuals or organizations engaged in such activities.

Mistral AI Medium

Customer will not, and will not permit any other person (including any End User) to: ... (d) attempt to reverse engineer, decompile, or otherwise attempt to discover the source code or underlying components (e.g., algorithms, weights, or systems) of the Mistral AI Products, including using the Outpu...

Perplexity AI Medium

You may not use the Services to attempt to circumvent, disable, or otherwise interfere with safety-related features of the Services, including features that prevent or restrict the generation of certain types of content.

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▸ View Original Clause Language DOCUMENT RECORD
"
You may not, and may not permit others to, combine, Distribute, or otherwise use the Licensed Technology with any code or other content which is covered by a license that would directly or indirectly require that all or part of the Licensed Technology be governed under any terms other than those of this Agreement (those licenses, the 'Non-Compatible Licenses'). This means, for example, that you may not combine the Licensed Technology with code or content that is licensed under any of the following licenses: GNU General Public License (GPL), Lesser GPL (LGPL) (unless you are merely dynamically linking a shared library), or Creative Commons Attribution-ShareAlike License.

— Excerpt from Unreal Engine's Unreal Engine EULA

Applicable regulations

CFAA
United States Federal

Provision details

Document information
Document
Unreal Engine EULA
Entity
Unreal Engine
Document last updated
May 5, 2026
Tracking information
First tracked
May 8, 2026
Last verified
May 10, 2026
Record ID
CA-P-006179
Document ID
CA-D-00751
Evidence Provenance
Source URL
Wayback Machine
Content hash (SHA-256)
2c28073bfe165d443fa38a6641837648ca3a0b47f6d869cb168805f5e7b2d8d7
Analysis generated
May 8, 2026 07:35 UTC
Methodology
Evidence
✓ Snapshot stored   ✓ Hash verified
Citation Record
Entity: Unreal Engine
Document: Unreal Engine EULA
Record ID: CA-P-006179
Captured: 2026-05-08 07:35:49 UTC
SHA-256: 2c28073bfe165d44…
URL: https://conductatlas.com/platform/unreal-engine/unreal-engine-eula/non-compatible-license-prohibition-gpllgpl-ban/
Accessed: May 13, 2026
Permanent archival reference. Stable identifier suitable for legal filings, compliance documentation, and research citation.
Classification
Severity
Medium
Categories

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Frequently Asked Questions

What does Unreal Engine's Non-Compatible License Prohibition (GPL/LGPL Ban) clause do?

Many open-source libraries and tools commonly used in software development are GPL or LGPL licensed, meaning developers must carefully vet every third-party library they incorporate into Unreal Engine projects to avoid an inadvertent breach.

Is ConductAtlas affiliated with Unreal Engine?

No. ConductAtlas is an independent monitoring service. We are not affiliated with, endorsed by, or sponsored by Unreal Engine.