What is dual licensing?

Dual licensing is a business model. Give everyone free permission to use your software in some ways, and sell permission to use the software in other ways.

For example, a developer might allow noncommercial use of their software for free and charge for commercial use, or allow use in open source projects for free and charge for use in closed.

Dual licensing is sometimes called “selling exceptions”.

Who is dual licensing?

Missing someone? Send a pull request or send an e-mail!

Any historic examples?

Where can I learn more?