It says: 5. FSF agrees that any program "based on the Works" offered to the public by FSF or its agents or assignees shall be offered in the form of machine-re

It says: 5. FSF agrees that any program "based on the Works" offered to the public by FSF or its agents or assignees shall be offered in the form of machine-readable source code, in addition to any other forms of FSF's choosing. However, FSF is free to choose at its convenience the media of distribution for machine-readable source code and may charge a fee of its choosing for copies.