What's the difference between PG and SPG?

What's the difference between PG and SPG?

Opis bibliograficzny
Wydane w:Philippine Star (16 Feb. 2012), C-1
1. autor: Lo, Ricardo F.
Format: Artykuł
Język:English
Wydane: 2012
Hasła przedmiotowe:
Philippines. Movies and Television Review and Classification Board
Television programs > Philippines > Rating