Freeword play, with exclusive copyleft granted to 'Us'.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Another wordplay: terminate rights granted by this license in case of PR.
But they still have the rights from the other agreement, so I don't know
how this helps.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>
Exclusive copyleft: add a try to make 'you' no longer able to grant more rights.

Signed-off-by: Engel Nyst <engel.nyst@gmail.com>