I think that's entirely up to the original channel developer. There's no way for you to get the code yourself unless it's open sourced somewhere, so you'd need to have an agreement with the original developer in order to use their codebase to begin with.
My Channels: http://roku.permanence.com - Twitter: @TheEndlessDev
Instant Watch Browser (NetflixIWB), Aquarium Screensaver (AQUARIUM), Clever Clocks Screensaver (CLEVERCLOCKS), iTunes Podcasts (ITPC), My Channels (MYCHANNELS)