Further Procedure
Section 9 preserved privilege of peerage — the right of peers of the realm to be tried by their peers. Section 10 stipulated that offences against the Act which were committed "only by preaching or words" must be prosecuted within six months.
Section 11 created a new rule of evidence for cases of treason under this Act (but not other treasons). It required all of the witnesses against the defendant (or at least two of them) to attend court to give evidence against him in person, "if living and within the realm". (The rule did not apply if the defendant pleaded guilty.) Different versions of this two witnesses rule were adopted in the Sedition Act 1661, the Treason Act 1695, and eventually in Article Three of the United States Constitution. The rule was first enacted in the Treason Act 1547.
Section 12 made similar provision to section 7.
Read more about this topic: Treason Act 1554, Provisions, Sections 9 To 12