Do you want to prevent leaks, or achieve some other goal? If you want to prevent leaks, this isn't an effective approach. If you want to achieve a different goal, that's fine, too, but orthogonal to the stated goal. For leaks, it's probably better to just restrict communications to the necessary distribution and understand that anything widely distributed is more or less public.

You can prevent all the leaks by having nothing bad to leak. That is what is being suggested.