Disallow for file system access

Hi All,
I would like to not permit to access to file system, how can i do that with permission object. I saw only examples how to set contraints on location where it can access.
Regards

I'm sorry but i dont understand the problem. (Maybe someone else will)
So you have told me that when you pass null to an file permission object, that you find out the mask is "NONE"?
You want to stop users accessing some files?
You need to build code that will stop the user accessing certain files
You want to know if you can put restrictions on the whole VM(What is VM?) or just the context?
I believe this Link could be helpful for you.

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