(CNN) -- Thousands of protesters have taken to the streets of Poland over the signing of an international treaty to enforce intellectual property rights on the Internet. Police said more than 10,000 people have taken part in the countrywide protests, which began Wednesday and are set to continue Friday. A group of lawmakers in parliament also protested the signing Thursday in Tokyo by the Polish ambassador to Japan. The legislation must be ratified by the Polish parliament before coming into effect. Protesters held signs and banners reading "No to ACTA." Their protests were largely peaceful, though there were a few skirmishes in the city of Poznan, where protesters threw bottles at police.
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The bill would fight counterfeiting and piracy
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Opponents say it amounts to Internet censorship
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Poland signed the treaty Thursday
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