code signing – CSP DLLs still needed to be signed?

I’m developing a custom CSP and I want to use it from Adobe Reader but it is not very clear to me if it still needs to be signed because here there is a note:

“Starting with Windows 8, it is no longer a requirement that CSPs must
be signed.”

So, it mustn’t be signed, am I right?

I’m asking this because from a custom test program (a c++ console) the CSP works fine but when I want to use it with sigtool.exe or Adobe Reader, my CSP DLL is not called.