" Free is Free as in BSD licensing, not as in GNU GPL"
The problem with BSD style licensing is that people can (and do) take your BSD code, roll it into their proprietary system and if they fork anything it doesn't get contributed back to the pool, plus "open source" code under BSD licenses frequently gets buried under the hood of expensive proprietary systems without the sources being acknowledged.
GPL is aimed at preventing that kind of thing from happening.
It's free, but if you distribute GPL-based stuff, you have to hand over the source code too. (If you don't, it's a simple copyright violation issue - this is the reason so few GPL cases have ever hit the court. almost all get settled(*) as soon as lawyers realise what they're up against.)
(*) Settled, as in the source code get released along with the product. When a lawyer tells the client that they have a choice of doing that or risking their product being banned from the marketplace it's a no-brainer.
Biting the hand that feeds IT
