Many are very wrong. The BSD like licenses have more freedom than GPL licenses... since you can wipe out freedom from the code. What is a freedom which can destroy itself?
It's is *not* a comparison based on the "amount of freedom" of each type of license. That's plain stupid. People who are saying that GPL licenses have more freedom than BSD like licenses are wrong. People saying that more freedom the better for software are wrong too... It's a matter of choice, balance and many other parameters... For me and many, it's GPL. -- use single GPL licensed software, use Linux and secure your digital freedom!