[vdr] VDR and DTT PayTV decryption

Hi all, this is my first post on the mailing list....then hello all. Well now i explain my problem. I'm italian and i use vdr about from 2-3 month....and it work very fine for me. Excellent software. On my HTPC i've installed vdr 1.7.9 with 2 tuners: a TT 3650 CI (DVB-S/S2) and a TerraTec Cinergy DT USB XS Diversity (2xDVB-T). From about 15 days ago i'm triing to use the TecnoTrend Common Interface for decypt italian Pay TV over DTT, but all my test are failed.

First question: Is possible for VDR use CI of this tuner for decrypt the encrypted channel of a DTT tuner? I've read much mailing lists, but i've found only a bit of posts that are 2-3 years old.

Can someone help me please?

Best Regards