Dear Friend -
Please note that this is not an Ab Initio forum. As far as Documentation and licensing is is concerned, Ab Initio is little bit different from other ETL tool vendors. Even you dont find any trial versions on their website itself. They only support and train the people referred by their current customers.
Please visit 'http://www.abinitio.com/abinitio/ab.nsf/contact' and talk to one of their service reps.
Actually, Ab Initio Support will talk to anyone who calls up or
emails them. They don't require any kind of user id. You definitely
won't get any demo software but you might get some documentation
if you call.