There is no copyright interest in a link but a lot of people think there is - including some Danish courts. The right to link is fundamental to the ability to construct indicies and databases of the internet, and participate in discourse on the net - it's a free speech issue [and] an internet architecture issue. We may as well kiss the web goodbye if we can't arbitrarily link to things.

Cory Doctorow (EFF)
as reported in Computer