To narrow what may be done. Restriction is a choice removed, and should say by whom.
Latin restringere (to draw back tightly, to bind fast): re- (back) + stringere (to draw tight, to bind); to restrict is to bind something so it cannot move as freely as it once could.
To narrow what may be done. The root's binding is never anonymous — a restriction drawn tight by nobody in particular should still say by whom it was drawn.