a direct quote from Eric Ward

Deep linking is not a problem that needs a legal solution. If you don't
want someone deep linking to your site, you write a two line script that
checks the referring URL, and then redirects anybody coming in from any
page that is not on your site already. It's so easy it's silly. End of
problem. I've been doing linking related consulting for 8 years, and I
would be thrilled to speak in court to the legal establishment as to why
lawsuits are 100% unnecessary for ALL linking related issues.