Do you need to licence OpenGL?

Applications developers DO NOT need to license OpenGL.

If you are a software or applications developer, you do not need to license OpenGL. Generally, hardware vendors that are creating binaries to ship with their hardware, or software developers that write an OpenGL driver, are the only developers that need to have a license. If an application developer wants to use the OpenGL API, the developer needs to obtain copies of a linkable OpenGL library for a particular hardware device or machine. Those OpenGL libraries may be bundled with the development and/or run-time options or may be purchased from a third-party software vendor without licensing the source code or use of the OpenGL trademark.

For complete information on Licensing, see the SGI OpenGL Licensing Programs page.