They are quite open, you can pay on the download screen http://www.ubuntu.com/download/desktop/questions?distro=desktop&bits=64&release=lts http://www.ubuntu.co

They are quite open, you can pay on the download screen http://www.ubuntu.com/download/desktop/questions?distro=desktop&bits=64&release=lts http://www.ubuntu.com/download/desktop/questions?distro=desk...