Are you saying you'd like an RSS feed for the
licensed database? Unless you've got quite a few series in your database it'd probably be easier to check each series feed individually to see if they return the:
series is licensed error.
I appreciate how inefficient that might be though, so the other thing you could do is write a PHP script that takes a look at the source for the
licensed database front page, and get the licensed anime names from that. I'm not sure how the Animesuki staff would feel about someone scraping that page (you'd probably have to ask permission first), but given that only a few animes are added each month, you'd probably only have to scrape that page once a week.
An RSS feed for the licensed database would be a good idea for
version 3 of the Animesuki site. You might want to repost your post into
wishlist thread, so that GHDpro knows about it.