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About the Opc.Ua.Client license

Kengo Iwamoto

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11/26/2024 - 22:02

Hello everyone.

I'm sorry for my poor English, but I would like to ask a question about the license.

I have decided to develop a commercial application for the OPC-UA client.

When I checked the library license on Nuget to use Opc.Ua.Client, it was listed as an MIT license.

However, the OPC Foundation License Portal states that it is a dual license of GPLv2.0 and RCL.

I cannot determine whether the license of Opc.Ua.Client is the MIT license or the dual license.

I would like to confirm the following two things.

1. If I am not a corporate member, will the license when using Opc.Ua.Client be the GPLv2.0 license instead of the MIT license?

2. Why is Opc.Ua.Client listed as an MIT license on Nuget?

Thank you in advance.

Randy Armstrong

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11/27/2024 - 08:24

Are you using the latest NuGet?

This is what the latest says:
https://www.nuget.org/packages.....26/license

You can't use Opc.Ua.Client without Opc.Ua.Core

Kengo Iwamoto

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11/27/2024 - 17:18

Thank you for your answer.
Nuget posted a topic after seeing the following URL:

https://www.nuget.org/packages......Ua.Client

Since Opc.Ua.Client requires Opc.Ua.Core, does that mean it will be dual licensed instead of MIT licensed?

Randy Armstrong

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11/30/2024 - 05:38

It is explained here:

https://opcfoundation.github.i.....TStandard/

James Webster

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09/25/2025 - 06:18

In my understanding the OPCFoundation.NetStandard.Opc.Ua.Client (MIT License) package is a derivative work from OPCFoundation.NetStandard.Opc.Ua.Core (RCL or GPLv2 License)?

"If your plugin or package links to a GPLv2 DLL, it is considered a combined work. The entire combination (plugin + GPLv2 DLL) must be GPLv2. If your main application loads that plugin, it may also be subject to GPLv2"

Is the MIT License correct for the Client package?? Doesn't seem correct to me and others as discussed here: the project licence · Issue #2347 · OPCFoundation/UA-.NETStandard

NuGet Gallery | OPCFoundation.NetStandard.Opc.Ua.Client 1.5.377.21

Randy Armstrong

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10/03/2025 - 01:49

MIT is GPLv2 compatible.

But this sounds like an issue that OPC needs to investigate more carefully.

It should not affect users since GPLv2 is inherited from Core no matter what.