The CPP appears to rule out any further civil action against Amanda Knox or Raffaele Sollecito by those who had their civil actions joined to the proceedings in this case.
Here is CPP Article 652 in English translation by Gialuz et al.:
Article 652 Effects of the criminal judgment of acquittal in trials for civil or administrative damages
1. The final criminal judgment of acquittal delivered after a trial shall have binding effect, with relation to either the ascertainment that the criminal act did not occur, or that the accused did not commit it ...in the civil or administrative trial for restitution and compensation for damages brought by the injured person or in his interest, provided that the injured has joined the proceedings as a civil party or has been given the possibility to join the proceedings, unless the injured has already brought the action in civil court, under Article 75, paragraph 2.
2. {Same effect for a fast-track trial.}
Here are Google Translate English versions of CPP Art. 652 and 530
Art. 652. Effectiveness of the criminal sentence of
absolution in the civil or administrative
damage.
1. The irrevocable penal sentence of acquittal
given on a trial has efficacy of
judged, as a finding that the crime does not
exists or that the accused has not committed or that the
was made in fulfilling an obligation
or the exercise of a legitimate right, in the judgment
civil or administrative for refunds and
damages brought by the injured or
in the interest of the same, provided that the injured
it is made or has been placed in a position
a civil action, unless the injured from
crime has exercised the action in civil pursuant
Article 75, paragraph 2. (1)
2. The same effect has the final court
absolution pronounced in accordance with Article 442, if
the plaintiff has accepted the summary procedure.
(1) The original words: "as promoted by the injured" to the end
paragraph have been replaced by art. 9 of Law March 27
2001, n. 97.
Art. 530. Judgment of acquittal.
1. If the crime does not exist, if the defendant has not
committed, if the offense is not or is not
required by law as a crime or if the offense is
been committed by a person not attributable or not
punishable for another reason, the judge pronounces
acquittal containing the reason
device.
2. The court shall render a judgment of acquittal also
when there is insufficient or contradictory
proof that the fact exists, that the defendant has
committed, that the action constitutes a criminal offense or the offense
was committed by the person responsible.
3. If there is evidence that the act was committed in
presence of a cause of justification or a cause
staff of non-punishment or there is doubt
the existence of the same, the judge pronounces
judgment of acquittal pursuant to paragraph 1.
4. With the acquittal the court shall apply, in
when required by law, the security measures.
See. Criminal Appeal, sect. II, judgment of 10 March 2009 n. 10582 in
Altalex Massimario.I
There is a difference in language in CPP Art. 530 between para. 1 and 2, and the words "reasonable doubt" do not appear in the translation. The relevant text in the English translation by Gialuz et al. is:
1. If the criminal act did not occur, the accused did not commit it...the judge shall deliver a judgment of acquittal, mentioning the cause in the operative part of the judgment.
2. The judge shall deliver a judgment of acquittal also in case of insufficient, contradictory or lacking proof that the criminal act occurred, the accused committed it....