CSO files are game backups. You should only create or download CSO files for games you physically own (original UMD discs). Downloading copyrighted games from the internet without owning them is piracy and violates the law in most countries.


If you prefer a more cultural/sociological angle, here is an alternative:

Title: The Grey Market of Portability: CSO Files and the Democratization of PSP Software Abstract: This paper investigates the socio-economic impact of the CSO file format on the Sony PlayStation Portable ecosystem. By analyzing forum discussions from 2005–2010, we explore how the CSO format shifted the PSP from a physical media consumption device to a digital-first platform. The study argues that the ability to compress 1.8GB games into 600MB files facilitated a massive "grey market" of piracy, ultimately hurting software sales but paradoxically extending the hardware's market relevance by transforming it into a versatile emulation machine.

To play a CSO file, you generally need Custom Firmware (CFW) or a HEN (Homebrew Enabler) like Infinity or 6.61 PRO.

A CSO (Compressed ISO) is a standard PSP ISO file run through a compression algorithm (usually LZMA or ZLIB). Think of it as a .zip file the PSP can read on the fly.

Convierte todos tus ISOs a CSO nivel 5 de forma masiva. Ganas un 40-50% de espacio sin apenas notar diferencia en carga.