Latin to English Other Education / Pedagogy College Diploma

At the top of a Latin Diploma from a college in Worcester, MA.

Q. B. F. Q. S.

Et Rei Publicae Literariae Bene Vertat
(And good wishes/good luck to the Scientific Community/The Republic of Literature)

PRAESES ET PROFESSORES
Collegii...
(The President and Professors of the College...)
Has litteras inspecturis S. P.
(To those who will read this document, S.P. ?)

***

Any idea about the S.P. acronym?
Maybe "Salutem..."?

Thank you for any help, it is urgent,
Flavio