"Very permissive" seems an odd way to put it. It's a human right. The way this is stated is just as if giving women the right to do everything men can do was "very permissive."
For example, the US and UK both have laws on libel/slander (I think most countries do), but the US is much more permissive than the UK, in the sense that it's a lot harder to prove that someone committed libel/slander.
Is it a "human right" to maliciously and publicly lie about whether some other person, say, killed a child for fun? You could certainly argue "people should be able to say whatever they want whenever they want", but I think most people would agree that some restrictions on that kind of speech is reasonable, because it ends up harming others.
It’s definitely not “anyone can say anything any time”, even this is not allowed in the USA. Libel, defamation, lying under oath, these things are not covered under free speech, nor should they be.
In my opinion, there’s no such thing as freedom of speech. It’s like freedom in general. Freedom from choice is also one.