ISO Tool v1.967 is released. ISO Tool is a handy homebrew application that lets you manage and backup your UMD's straight from your PSP. ISO Tool completes by Japanese Developer Takka.

ISO Tool v1.967 Changelog:
[NEW] DATA / key.txt Add
[NEW] for decoding tag / key such as the above, key.txt reads like the change (if there can not be decoded)
(type 6 is not supported)

Download: ISO Tool v1.967
Source: Here