Thanks Arun. Even though I knew the datasets, I didnt know the WFS links. They are awesome.
Well, in my opition after analyzing several sources and gazette notifications for India:
WPAD (protected planet): useless
OSM: not so good and consistent
ENVIS: good for some areas but not existent, wrong or not well georeferenced for many areas
I assume that the best sources are the respective environmental/forest departments of the individual states, but unfortunately they don't publish that data.
Another good and serious source seem to be the ESZ notifications from the Ministry of Enviroment and Forest, but you really need to digitalize everything.
Javier