NBC wants to keep the I.P. rights? That's low. Didn't NBC try and stop Letterman from doing his Top 10 list when he went to CBS? He kept doing it.
Additionally, because of intellectual property disagreements, Letterman was unable to import many of his Late Night segments verbatim, but he sidestepped this problem by simply renaming them (the "Top Ten List" became the "Late Show Top Ten", "Viewer Mail" became the "CBS Mailbag", etc.) [wikipedia]
In The Year 4000? The Self-Gratifying Bear? Rude Puppet Dog?
The last two weeks have been outstanding television. The controversey is bringing out the best.