they must get the prices on the various songs from the publishers. But they also have a notion about how many sets they are hoping to sell and the profit margin to keep the releases coming. Music publishers can be the biggest pains in the universe so if the folks controlling the song want $10,000 for clearance, the folks at CBS DVD are going to slash the song rather than go into the red on the project. While it stinks that there's a few seconds snipped, I'd rather have slightly incomplete shows and all five seasons out on DVD than not get to see the show or see it butchered down to 22 minutes on cable.