Prevent non-logged users from seeing questions

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Hi,

It does not seem possible at the moment to restraint non-loggued users from viewing the Q&A site content (beside the signing-up feature). Can it be done ? Or could it be implemented in the near feature ?

PS: As I could not find any way to enable such feature, I've marked this question with a 'feature-request' tag - please remove it if the feature actually exists.

Thanks for your time and consideration. Ben