Look for community-vetted archives. Trusted repositories often provide "Clean Pops" or "PSN-version" PBPs which are ripped directly from the official PlayStation Store. Creating Your Own PBPs
PBP files are often much smaller than original disc images. pbp files download
This paper provides a technical examination of the PBP (PlayStation Portable Bundle) file format. Originally developed by Sony Computer Entertainment for the PlayStation Portable (PSP) handheld system, the PBP format serves as a versatile container for executable data. This document details the internal architecture of the PBP file, the protocol mechanisms for downloading and verifying these files via the PlayStation Network, and the implications of the format on digital rights management (DRM) and the homebrew community. Look for community-vetted archives