I think you have got the whole thing wrong..
You say the McCanns have to prove themselves guiltless...but they have not called one witness to this effect...all their witnesses have been to confirm their suffering....
You say that amaral doesn't have to prove anything....yet all his witnesses have been called to support his thesis
the facts speak for themselves... I think you are totally wrong
I think your favourite word is 'wrong'.
The civil libel laws in Portugal as Carana has pointed out puts the onus on the plaintiff to prove his or her case. The defender does not have to establish anything unless he or she chooses to do so. It was exactly the same when Murat sued the Portuguese Press, he had to establish that his reputation and honour had been impinged by the articles written about him.
Free speech is very important to the Portuguese and this is also reflected in their libel laws. As you know Amaral eventually won his case over the book and DVD ban because in the end the Court accepted they were in accordance with that which was already in the public domain.
If the libel action fails I wholly expect Amaral to raise a case for damages and that then will be for him to prove.