I have own custom shit
But this is just for promotional pages though, anything with a member-section
probably needs a more advance solution, like one of the pro script.
1. Promo-pages set a cookie, valid for the whole domain and ~30 minutes.
2. The .htaccess of my content directories checks if this cookie is set - if not, "no show"!
Beautifully simplistic & works well enough - makes at least movie submitting safer..