Around 20,000 protestors marched in Krakow and Warsaw on Thursday after Polish Prime Minister Donald Tusk's government signed the Anti-Counterfeiting Trade Agreement (ACTA) treaty . . . ACTA would establish international standards for the enforcement of intellectual property rights and is similar to the recently scuttled Stop Online Piracy Act (SOPA) and Protect-IP Act (PIPA) that generated intense controversy in the United States last week . . . several other countries in the European Union signed the treaty on Thursday, including Finland, France, Ireland, Italy, Portugal, Romania, and Greece, while the United States, Australia, Canada, Japan, Morocco, New Zealand, Singapore, and South Korea signed the treaty last year . . . the treaty needs to be ratified by Poland’s parliament and president before becoming law . . . Poland could face retaliation from cyber attacks from the international hacker group Anonymous, similar to those that hit the websites of the U.S. Department of Justice, the U.S. Federal Bureau of Investigation, Universal Music, the Recording Industry Association of America, and the Motion Picture Association of America last week . . . the treaty is expected to be ratified by the European Union parliament in either April or May.