51.   With the physical barriers all but removed, the reliance of copyright holders on the law may be straining it beyond its capacity to be effective.

52.   Zennstrom is negotiating with copyright holders in Europe to secure rights to offer songs for download.

53.   And copyright holders -- including sports, advertising, TV programming and film groups -- this week banded together to form an assembly to protect their interests.

54.   Another strategy being used by Napster to police its users has been to ban those who are caught and identified by copyright holders while swapping pirated songs.

55.   But when U.S. viewers began logging on, copyright holders yelled foul.

56.   Copyright holders, such as the record industry, the software industry and performers, want amendments that would allow an EU committee to oversee the practice.

57.   European lawmakers have been sympathetic to copyright holders in past debates, viewing such a stance as a way to support European culture and investment in creative industries.

58.   Essentially, music files would not be usable outside the Napster program unless the copyright holder allows it, said Johann Butting, chief executive of Digital World Services.

59.   Fair use generally allows individuals to duplicate copyrighted materials for education and other such purposes without compensating the copyright holder.

60.   For one, copyright holders, Internet companies and Congress need to tackle new thorny licensing issues.