PSP:Region Information

Marketing Region
As per Sony Computer Entertainment tradition, the console's region is summarized by the last digits of the model number:

This (which can be spoofed by some CFWs) also affects the availability of certain features on the XMB.

Game Region
No PSP games are region locked, neither is the PS1 mode (although official distribution did vary).

UMD Video region
UMD movies follow the same region encoding as movie DVDs (including the ability for a title to be partially or fully multiregion).

Note that the region spoof feature in CFWs does not currently affect this.

Color System
Although the PSP strongly encourages YPbPr, it also offers composite and S-video; it is currently undocumented where the PAL vs NTSC setting is stored.