A survey finds two-thirds of Internet users who download music don't care whether they're violating copyright laws.

The survey by the nonprofit Pew Internet and American Life Project estimated about 35 million American adults use file-sharing software. That's about 29 percent of Internet users.

SURVEY Do you care whether the music you download is copyrighted? Yes, I only buy from legitimate sources. I care a little, since I could get in trouble. No, I'm just glad it's free. Results  |  Disclaimer

The poll was taken before the Recording Industry Association of America announced its aggressive campaign to sue individual computer users who illegally share "substantial" collections of music.

Three years ago, 61 percent said that they didn't know or didn't care about whether they were downloading music illegally.

The report called Americans' attitudes about copyrights "dismissive."

The chairman of the Senate's permanent subcommittee on investigations has begun looking into the industry crackdown. He calls it "excessive."

Republican Sen. Norm Coleman said, "Theft is theft, but in this country we don't cut off your arm or fingers for stealing."