Ru-Net II, a Russian digital investment company, has bought the online music and film distribution platform Digital Access from a partnership that includes Warner Music Group Corp. and Sony Music Entertainment.

Digital Access was launched in 2007 with investment from Warner Music, Sony, and Access Industries to distribute songs, ring tones and videos to online portals and mobile operators. It offers more than 250,000 songs and 5,000 videos. The Russian newspaper Kommersant reported the deal Sunday.

Ru-Net II, a division of Russian tech investment firm Ru-Net Holdings, is run by Leonid Boguslavsky and Dmitry Alimov, who were in charge of media investments at Access Industries in 2004-2005. It has been estimated that Digital Access handles 20 and 30 percent of the mobile music market in Russia.

Shares of Warner Music, based in New York but with much of its operations in Los Angeles, were down 8 cents, or nearly 4 percent, to $2.05 in morning trading on the New York Stock Exchange.