The hybrid model in open source
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| Hybrid licensing comes in three flavors:
|
| 1. An open source developer holds out some code as proprietary.
| Medsphere is doing this.
|
| 2. An open source developer sells an enhanced "pro" version of
| their code. Pentaho does this.
|
| 3. An open source developer offers a commercial license to
| customers who don't want the obligation of donating code back
| to the project. OpenClovis does this.
|
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http://blogs.zdnet.com/open-source/?p=852
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