This is my take on the last few pages of this discussion.
No one on here is an expert in Italian law. We can all guess as to what certain articles mean but it seems no one can come up with a definitive answer.
The correct verdict was finally achieved, but why and how is as confusing as ever.
....
The relevant Italian procedural law, translated into English, is actually rather clear. It is only the false and misleading statements of some posters on the internet that may be leading to confusion.
Here are the facts; there is no dispute about them within the Italian legal system:
The Supreme Court of Cassation (CSC) examined the appeals of Knox and Sollecito, and the answering appeals of the prosection, to the Nencini conviction, under the Italian Code of Criminal Proceedure Article 606.
The CSC delivered a verdict after hearing the lawyers for the parties, examining the relevant documentation, and deliberating.
The verdict is that Knox and Sollecito are
not guilty of the charges of murder/rape of Kercher. This verdict was delivered based on Italian CPP Articles 620 (L) and 530.2.
The verdict of the CSC was an annulment of the previous lower court - the Nencini court - verdict, with the CSC ruling no referral to a new lower court was necessary. The CSC authority to rule in this fashion is established by CPP Article 620 (L).
The Nencini court, based on the appeal of the prosecution, convicted Knox of aggravated calunnia of Lumumba and increased her sentence for that conviction. ("Aggravation" meaning that the calunnia was committed to cover-up another crime.) The CSC annulled that verdict without referral under CPP Article 620 (L). It had to annul the aggravated condition, because that "aggravation" was based on the conviction for murder/rape by the Nencini court, and the CSC acquitted on the murder/rape charges, thus eliminating the grounds for aggravation. The CSC thus reinstituted the calunnia conviction as finalized previously by the CSC Chieffi panel, with of course, no increase in the sentence.
Knox has lodged a claim with the European Court of Human Rights (ECHR) that her rights under the European Convention of Human Rights (the Convention) were violated by Italy convicting her of calunnia. The ECHR functions, by treaty, as the supreme human rights court of the Council of Europe (CoE) States, including Italy.
Her case before the ECHR has not yet been heard; it is waiting in the queue of the many thousands of cases the ECHR must adjudicate from the CoE States. If the ECHR, on hearing the case, rules that Knox's rights were violated, then Italy will be obligated by treaty, its Constitution, and a 2011 ruling of the Italian Constitutional Court, to either vacate the conviction or conduct a revision trial that conforms to the Convention.