What is "sedeprivationism"

n. The school of thought, in Roman Catholicism, that the popes from http://en.wikipedia.org/wiki/Pope%20John%20XXIII were defective because of their modernist views

Sedeprivationism is a term coined by British traditionalist Catholic theologian William J. Morgan for the ideological school or party of the traditionalist Roman Catholic and sedevacantist movement that holds that Popes since John XXIII have been defective Popes, following the principles of the late French theologian Michel Louis Guérard des Lauriers, O.P., as Lauriers set it out in his thesis published in the Cahiers de Cassiciacum and therefore called the "Cassiciacum thesis".