I wouldn't be asking people to resign saves for you for a couple of reasons:
It requires your PS3's IDPS, which they could use on there own PS3 which would end up with your PS3 getting abnned form PSN. And also if the user profile on your PS3 has a PSN account attached to it it will also require your PSN accounts NP ID as well to resign them.
Also the save files will contain some per console/account info which you wouldn't want others finding.
There is one way around all of it> if your on CFW then install REBUG REX CFW, go to the DEBUG Settings menu, then find and enable "Fake Save Data Owner"> this basically bypasses the need for the save to be yours and you can then use any save, from any PS3, from any game without issue.