In the case of Snort, that would be protection from 5-10 VC-funded commercial companies releasing products that compete with Sourcefire's product, the core of which (in fact, the entire v1.0 of which) is simply Snort. Does that sound fair to you? That someone would collect $5MM to build a 30 person engineering team that gets to start picking off customers in 3 months by repackaging your code? It doesn't sound fair to me at all.