> The GPL is a contact that takes away some rights of the people using it, and that makes everyone freer?
It is not that simple. The GPL "takes away" some rights of the distributor of the software (their ability to restrict redistribution for example), but grants rights to the end user (the ability to modify and redistribute) of the software.
It's all perspective. As the developer the GPL may feel limiting, but as a user it is liberating.
I don't think you've really clarified anything. It is a trade: ensuring greater freedoms for the end user by adding restrictions -- by definition "not freedom" -- to developers/distributors.
I'm not saying that's a bad trade off to make, but it is absolutely a fact that the GPL takes away some rights. Or, since it is a copyright license, where the default in copyright is you get no rights, you might instead say it does not give all possible rights. I think it's important to recognize that sometimes "the greater good" comes at a price.
> it is absolutely a fact that the GPL takes away some rights.
Expressing it like you did is misleading. One man's freedom is another man's restriction. It's two sides of the same coin.
It is absolutely a fact that laws against murder take away some rights. Suddenly you are not allowed to kill other people. You do not have that "freedom" anymore. Flipside is that others now have the freedom to walk around without fearing that they can lawfully be killed by others. You pay for granting one "new" freedom by removing another, opposing freedom.
The GPL grants new rights for a party by restricting rights of another party. Just like all licenses do.
It is not that simple. The GPL "takes away" some rights of the distributor of the software (their ability to restrict redistribution for example), but grants rights to the end user (the ability to modify and redistribute) of the software.
It's all perspective. As the developer the GPL may feel limiting, but as a user it is liberating.