I m far from a copyright law junkie but it seems that that source only makes a case for unlocking the cell phone and not jailbreaking it The paper argues how keeping a customer within a certain wireless carrier has little or nothing to do with protecting copyright and it s only a mechanism to benefit a third party and this line of thinking may apply to third party apps but the lack of cell phones in the market that run applications is too small to have made an impact in the legal system There was a brief mention on how locking a cell phone protects the downloaded content from copyright infringement but it was inconclusive This latter point could certainly be argued against third party apps such as SSH ing into the phone and downloading ringtones from it That is kind of moot however because a copy is left in the iTunes library anyhow