Sony has not sued an end-user for key downloading (they target emulator creators and hackers), but they have actively patched the PSN to detect and ban consoles using altered keys.
Searching for "PS3 keys download" usually refers to one of two things: (required for emulators like RPCS3) or individual game license keys (.rap files). ps3 keys download
Searching "PS3 keys download" is a minefield of outdated 2012-era malware. Here is how to stay safe: Sony has not sued an end-user for key