A. Introduction

The OPC Foundation provides source code as sample code/reference implementation. The source code is provided as-is, with no warranty, support, or misrepresentation of the quality of code.

The OPC Foundation provides communication stacks, sample libraries, sample applications and utilities. All sources are available either as a downloadable ZIP file or in a repository on github (https://github.com/OPCFoundation/).

B. License models

The OPC Foundation provides different licenses depending on the component and on the membership status of the user of the sources. A single ZIP file or a single repository can contain multiple components where the sources have different license models. The valid license is in the header of each source file.

Following are basic rules on how the OPC Foundation licenses the different components:

1. OPC UA core components (OPC UA Stacks, OPC UA Local Discovery Server - LDS) follow a dual-license model:
   • OPC Foundation Corporate Members: RCL
     enables OPC Foundation corporate members to deploy their applications using the core component sources without being required to disclose the application code.
      
   • Users that are not OPC Foundation corporate-members: GPL 2.0
     Based on the GPL 2.0 license terms these users must disclose their application code when using the core component sources.
      
2. Samples and Utilities:
   All samples and most of the utilities are provided under the MIT license for OPC Foundation Members and Non-Members.