ISO Tool v1.975 can patch EBOOT.BIN game files, NPDRM’ing ISOs to appear as downloaded PSN content, letting you load ’em up. The translated change log can be found on the download page. The PSN-downloaded game title created in step 4 & 5 is added to the PSN. The change log is found in the translated version of the latest version of Takka’s ISO Tool for PSPgo. The tool can be downloaded from the XMB on your PSP.
Source: https://thehackernews.com/2011/05/hack-your-sony-psp-iso-tool-v1975.html