RIAJ_Phonograph.jpgThe record industry’s war against piracy isn’t just happening over here: FierceMobileContent reports that the Recording Industry Association of Japan is ramping up efforts to prosecute music sites alleged to be sharing illegally copied music—specifically, across mobile networks.

“The RIAJ announced the arrests of two men alleged to operate mobile music download site Daisan Sekai,” which is reported to have attracted more than a million unique users, the RIAJ said. Mobile subscribers nationwide illegally downloaded more than 399 million music files in 2007 alone, according to the article. It was unclear from the announcement whether the site was a premium music portal or a file sharing hub.