Bootlegs can consist of recordings of live performances or material created in private or professional recording sessions. Changing technologies have had a great impact on the recording, distribution, and varying profitability of the underground industry. The copyrights for the song and the right to authorize recordings often reside with the artist, according to several international copyright treaties. The recording, trading and sale of bootlegs continues to thrive, however, even as artists and record companies attempt to provide "authorized" alternatives to satisfy the demand. The internet has become a popular medium to distribute bootleg material.