ESP is licensed under two separate licenses. You may use either, provide you fully comply with the governing terms.
ESP Commercial License
The ESP commercial license is a royalty-free license that provides you with the following benefits:
- The right to develop and modify the software to embed in your products
- The ability to redistribute your products with the software
- The ability to keep your source code private
- Simple royalty-free, one-time purchase options
- Software maintenance for updates, upgrades and security patches
- Priority software support services
Open Source License
ESP my be used with the GPL Open Source license. This is ideal for evaluating ESP, for internal use, stand-alone use, or for integrating exclusively with other GPL software. If you intend to distribute your software and link ESP with your application, the GPL requires you to provide public and full access to all source code and documentation on a nondiscriminatory basis. If you do not wish to provide source code to your application, you must purchase a commercial license.
If you are evaluating ESP internally, and not distributing any products containing ESP, then you may be able to use the GPL license for this evaluation. Once complete, you may purchase a commercial license so that you can distribute your product. You may evaluate, develop, modify, and embed ESP in your application or product provided it is not distributed. You may copy and modify the source code provided all copies fall under the GPL license.
Stand Alone Use
If you are using ESP in a stand-alone manner as free-standing binaries, and are not integrating the ESP source code or libraries with your software to create a derivative work, then the GPL license may be sufficient. Stand-alone use does not permit linking ESP using either static or dynamic linking.
Use with Other GPL Software
If you are integrating ESP source or libraries into your application and your software is also fully licensed under the GPL license, you may use ESP with the GPL license and embed ESP in your applications or devices. You do not need any other agreement or license — the GPL is all you require.
Embedding with Non-GPL Software
If ESP is embedded into your application, or your application is linked using static or dynamic linking with libraries containing any ESP source code and you do not wish to publish your source code under the GPL, then you will need the ESP Commercial license.
Please contact firstname.lastname@example.org if you have any questions about licensing ESP.