The issue was that the software was redistributed without including acknowledgment of the original work, including information about changes the defendants had made to the software, and with no mention of the software’s copyright holders.
“They also proceeded with the unlawful behavior [of] ignoring the formal termination notice,” the company added, “which is the first protection tool implemented to safeguard the developers who decide to share their code in a free form.”
From http://ifthisbetreason.com/2021/12/italian-courts-find-open-source-software-terms-enforceable/