Are you sure it's "copywrite" and not "copyright"? If it's "copyright", maybe removing the copyright flag might help. I saw a program which was capabile of doing that, but I cannot remember the name or the URL.

Edit:
OK, got it...It's called MP3/Tag Studio:
http://www.magnusbrading.com/mp3ts/Try removing the copyright flag of the first frame only. If it doesn't work, set it to remove it from all frames.