I find it all a real grey area. If she had used the actual creep instrumental entirely that would be worthy of 50/50 but its only really the underlining chord structure, I see more claim in the Vanilla Ice situation. Its really hard to say. Its almost like in these cases you would have to break down the elements of the song and decide what percentage of the song was similar, cause after everything added by Lana and Sean the producer you might say only 20% of the song was the same as Radiohead creep, and at that rate is there a particular artist who should be getting 50/50 cuts of every song in the key of G or that uses say a G EM pattern together and so forth to infinity. I only see need for percentage splits when its directly the same as very close in the Vanilla Ice example, and its still a maybe as there is a note change. Then it makes you ask the question how many note changes need there be? what about strum pattern? I have several songs that are the same exact chords as alot of basic nirvana songs and yet they sound nothing alike. Its a thinker!!!