“A federal appeals judge on Tuesday questioned whether distributors of online file-sharing software should be held responsible for copyright infringement just because some people use the programs to swap copyright music and movies.” The entertainment industry estimates that 90% of the content flowing through file-swapping sites is illegal, and argues that the company’s that make the software count on pirates for most of their business revenue. “The case’s outcome could determine whether music and film companies can hold distributors of file-sharing software liable for illegally swapped music and movies online.”