I would like to implement a "Pull down to refresh" into my application. Just like twitter has in their iPhone app. I have found a good source code: PullDownToRefresh but people are saying that they have copyrighted it or somewhat? Please could anyone clarify? And also, does anyone know of any good tutorials for this pull down to refresh? Thanks.
![Pull down to refresh](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)