A sign like this would have driven Milton crazy. One of Milton's crowning arguments of Areopagitica is that God gave man reason and temptation to use. He says
"Many there be that complain of divine providence for suffering Adam to transgress. Foolish tongues! When God gave him reason, He gave him freedom to choose; for reason is but choosing; . . . God therefore left him free, set before him a provoking object, ever almost in his eyes."
The idea that reason allows us to choose good from evil necessitates unrestrained options. If you have no options you cannot choose. If this is true and Milton himself doesn't have the rights he desires, is it any wonder then that Milton lobbied for freedom of press, freedom of religion, and a free government? One scholarly review by William Haller argues
"the more each protesting body suffered from intolerance the more tolerant it became, that the more it was forced to contend for liberty for itself the more nearly it approached the conception of liberty for all, with the result that implied principle was finally by the ultimate dissenters extricated from all the pain of cumulative persecution and kindled, as it were, 'on the top of a light-house, on its own account.'"