License

You can use CopperLicht basically for free. The following is the exact license text:

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CopperLicht License

Copyright © 2009-2010 Nikolaus Gebhardt

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it subject to the following restrictions:

1. If you use this software in a product, an acknowledgment in the product documentation is necessary.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

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Commercial License

As you read above, CopperLicht is basically free to use.
But if you are a professional developer, you can get a commercial CopperLicht license. That license includes:

• Access to the full, uncompressed fully documented source (that is currently about 17000 lines of JavaScript code in about 50 files)
• Scripts to create your own compressed copperlicht version from your modified source
• Access to preliminary patches
• Higher priority support (company license only)
• Free updates for one year

Details can be found in the commercial license text here.

For Students and Hobbyists If you are a student or hobbyist and not a company, you can get the license for a reduced price. Some very few javascript files (~2%) like .ccb loading might be still be compressed, though. Price: 79 €

For Companies and Professionals For companies and professionals, this license applies. The license fee for this is per programmer seat for one year, including high priority support. Price: 1900 €