access rights on a container ?

Hi,

I would like to define access rights required to access and update a 
container (file ipload, text field) in the template itself, testing the 
belonging to a given group.
Is this possible ? How ?

Can access rights be different for the same container but for each 
language ? a given group can edit the french version, another group the 
english version, and so on ...?

Thanks for your help

Olivier Vit