This censorship peaked on 4 May 1557, when Mary I issued a royal warrant formally incorporating the Stationers' Company. The old method of censorship had been limited by the Second Statute of Repeal, and with Mary's increasing unpopularity the existing system was unable to cope with the number of critical works being printed. Instead, the royal warrant devolved this power to the Company. This was done by decreeing that only the Company's publishers could print and distribute books. Their Wardens were given the power to enter any printing premises, destroy illegal works and imprison anyone found manufacturing them. In this way the government "harnessed the self interest of the publishers to the yoke of royal incentive", guaranteeing that the Company would follow the rules due to the economic monopoly it gave their members. With the abolition of the Star Chamber and Court of High Commission by the Long Parliament, the legal basis for this warrant was removed, but the Long Parliament chose to replace it with the Licensing Act 1662. This provided that the Company would retain their original powers, and imposed additional restrictions on printing; King's Messengers were permitted to enter any home or business in search of illegal presses. The legislation required renewal every two years, and was regularly reapproved.