One of the big guns of the Wild West days of freely downloading music and movies over the Internet is going straight.

Settling lawsuits around the world, the company behind software called Kazaa said Thursday it will redesign its pioneering file-sharing program to block customers who try to find and download copyrighted music and movies. It also will offer licensed entertainment for a price, and it agreed to pay more than $115 million in penalties to leading music and movie companies.