Is Snape protected by Fidelius?

[pippin_999]

No: HPFGUIDX 89007

 Erin:
>> But, from the way I understood the charm to work, if 
Dumbledore is  Snape's secret keeper this time around, then 
Snape should have not  been able to admit to Harry that he was 
spying.  Only DD could do  that.  Unless Snape is his own secret 
keeper?<<

I was supposing the  original Secret Keeper charm is still in 
effect. The secret was revealed by Dumbledore in the Pensieve, 
so Harry knows it and can discuss it with Snape. The way I 
understand the charm, people who have been let in  on a secret 
can discuss it amongst themselves--as they do at Grimmauld 
Place. It would have been deuced awkward if James, Lily 
and Harry were invisible to each other!

Pippin