A US company that sells meditation music has filed a federal legal action against file-swapping Internet site Napster.
It alleges a warning notice included with its product is omitted in the Napster version.
The light and airy flute music, with sounds of birds and running water in the background, may pose a danger to drivers or heavy machinery operators who could fall asleep from the mellow tracks.
The documents were filed on Monday in the US District Court in Portland, Oregon.
The Beaverton-based Centerpointe Research Institute, which specialises in meditation music and materials, asks Napster for protection against liability associated with the downloaded files.
"Having Napster giving this out for free puts us in a position of people using this who don't know what this will do," said Centerpointe founder Mr Bill Harris. "It's not just like listening to music."
Napster declined to comment on the action.
Napster, which is based in Redwood City, California, is currently striking deals with record companies for legal music distribution.
PA