encrypt pdf with trusted certificates on acrobat pro xi

Hi all,

I'm supporting a user who used to encrypt documents with trusted identities (*.fdf) on Acrobat X.

Now on Acrobat XI, when trying to encrypt a document, he can't used trusted identities. It seems like Acrobat XI only allow encryption from Digital ID (imported from *.pfx)

Is this correct? Any way we can encrypt on Acrobat XI with trusted identities?

Thanks.

Welly