All Creative Commons licenses have many important features in
common. Every license helps creators — we call them licensors if
they use our tools — retain copyright while allowing others to
copy, distribute, and make some uses of their work — at least
non-commercially. Every Creative Commons license also ensures
licensors get the credit for their work they deserve. Every
Creative Commons license works around the world and lasts as
long as applicable copyright lasts (because they are built on
copyright). These common features serve as the baseline, on top
of which licensors can choose to grant additional permissions
when deciding how they want their work to be used. A Creative
Commons licensor answers a few simple questions on the path to
choosing a license — first, do I want to allow commercial use or
not, and then second, do I want to allow derivative works or
not? If a licensor decides to allow derivative works, she may
also choose to require that anyone who uses the work — we call
them licensees — to make