This is a gray area. The homebrew itself is legal because it is original code written by fans. However, distributing an that may contain copyrighted assets (like the name "Minecraft" or specific block textures) could violate Mojang’s intellectual property rights.
Disconnect from the PC, go to Game > Memory Stick on your PSP XMB, and select Minecraft. Minecraft Psp 5.7.4 Download Iso
Because Mojang never released an official port for the PSP (it was released for the PS Vita and PS3/PS4 instead), developers built clones from the ground up. These versions use custom engines to run on the PSP's hardware: This is a gray area