The French MEP said that negotiations over the controversial anti-piracy agreement "lacked transparency", and claimed that the European parliament was denied its say.
Arif condemned the ACTA deliberation process, saying that he witnessed "never-before-seen manoeuvres from the right wing of this parliament to impose a rushed calendar before public opinion could be alerted".
He also spoke out to "denounce in the strongest possible manner the process that led to the signature of this agreement", stating that there was an "exclusion" of the parliament's demands on numerous occasions, The Parliament reports.
Arif added: "Everyone knows ACTA is problematic, whether it is its impact on civil liberties, the way it makes internet access providers liable, its consequences on generic drugs manufacturing, or how little protection it gives to our geographical indications.
"This agreement may have a major impact on the lives of our citizens, and yet everything is done so that the European parliament has no say. I will not participate in this charade."
ACTA, which aims to establish international standards on intellectual property rights enforcement, was signed yesterday by 22 EU member states, including the UK.
Following the announcement, a mass protest took place in Poland, and a cyber-attack - believed to be the work of hacker group Anonymous - struck the European parliament's website.
The European Parliament is yet to ratify the ACTA treaty, and is due to hold a debate on the matter in June. Critics of the agreement warn that it could impinge on civil and digital rights, such as freedom of expression and communication privacy.
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