In advance of the bench trial in which Apple will have to fight off charges that it colluded -- and fostered collusion -- with publishers to raise prices on e-books, both the iPhone maker and the US Department of Justice have filed initial court documents to lay out their respective cases. At issue is both the use of Apple's "agency model" pricing scheme, as well as former CEO Steve Jobs' overtures to the major publishers -- seen by some as trying to wrangle publishers into raising prices.