电脑上的copyright是什么意思？

就是版权的意思

举例子：

who owns the copyright on this song?

谁拥有这首歌曲的版权？

copyright expires seventy years after the death of the author.

版权在作者去世七十年后期满无效。

they were sued for breach/infringement of copyright. 他们被指控侵犯版权。