PS3HaX member K.G has released an application to resign game saves, it also lets you remove copy protection from the saves, here is a quote from the release thread:
Hi guys this is a PS3 save resigner.
Thanks to @ flaz_z for his amazing work. The games.conf is from aldostool.
This is just for people who needs an easier way to use flat_z’s tool.
Credit goes to flat_z for his pfdtool.
You can resign any saves from any regions to any regions. From any accounts to any Accounts.
You can also remove the copy-protection.
It’s easy to use, and very user-friendly. It works for Retail PS3.
All you have to do is search for the keys on internet (watch the video).