a SELinux policy is unlikely to keep skype from sending audio and video even when you aren't on the network... it's not just your calls that might be compromised, but anything you mention (or do) in the presence of a computer running skype
That's not really true. A decent policy can prevent a rogue skype process from reading files that it has no business reading, so the only things it should be able to transmit is data it already has (e.g. the audio of your call)
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