Singstar activate Songs that bought from the web

Hello everbody,

I have a problem with my Songs that I bought from the Playstation Store.
How I can activate the Songs in rpcs3?
I've transfer the files from my PS3 to rpcs3 but if I open Singstar Ultimate Party I can see the songs at the library but they are looked and I got a message to dowload the songs again because the system has changed. 
Maybe there is a way to unlock the songs...?

Thanks for your help