AN JOSE, Calif. -- After a chorus of criticism, Sony Corp.’s music division said Wednesday ... Sony unit to distribute so

AN JOSE, Calif. -- After a chorus of criticism, Sony Corp.’s music division said Wednesday it is distributing a free software patch to reveal hidden files that automatically installed to hard drives when some of its music CDs were played on personal computers.

Sony BMG Music Entertainment and its partner, UK-based First 4 Internet, said they decided to offer the patch as a precaution, not because of any security vulnerability, which some critics had alleged.

"What we decided to do is take extra precautionary steps to allay any fears," said Mathew Gilliat-Smith, First 4 Internet’s CEO. "There should be no concern here."

The controversy started Monday after Windows expert Mark Russinovich posted a Web log report on how he found hidden files on his PC after playing a Van Zant CD. He also said it disabled his CD drive after he tried to manually remove it.

Russinovich made the discovery while running a program he had written for uncovering file-cloaking "RootKits." In this case, the Sony program hid the antipiracy software from view. Similar technology also has been used by virus and worm writers to conceal their code.

A firestorm quickly erupted over what appeared to be an attempt by the music company to retain control over its intellectual property by secretly installing hidden software on the PCs of unsuspecting customers.

Making matters worse, Sony did not disclose exactly what it was doing in its license agreement, Russinovich said. It only mentions that proprietary software to enable copy protection would be installed. The software affects only PCs running the Windows operating system.

"The (license) makes no mention that it’s going to install something that’s going to be hidden from view, that will constantly consume CPU resources even if I’m not listening to music and it will have no uninstall capability," he said.

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