What Is An "Illicit Mass"?

THE GENERAL INSTRUCTION
 OF THE
ROMAN MISSAL

CONGREGATION FOR DIVINE WORSHIP
AND THE DISCIPLINE OF THE SACRAMENT
INSTRUCTION

Redemptionis Sacramentum

On certain matters to be observed or to be avoided
regarding the Most Holy Eucharist

"A LICIT Mass can still be valid. Liceity merely means the priest and other ministers follow the rubrics (liturgical rules) precisely."

Fr. John Trigiliohttp://www.ewtn.com/vexperts/showmessage.asp?number=438505&Pg=&Pgnu=&recnu=



"Licit. A licit Mass follows the rubrics.
Illicit. Such a Mass contains liturgical abuses, small or grave."

Colin B. Donovan, STL
http://www.ewtn.com/vexperts/showmessage.asp?number=317276&Pg=&Pgnu=&recnu=