but it there is choice offered to everybody, the whole exercise becomes meaningless.
in order to defend the rights without complications, ALL rights must be with IDA. offering choice will result in NOT ALL rights being with IDA, therefore adding complications should the need to defend copyright ever arise.
as it has been said before (if i read that right) exceptions will be made, but only within reason. present your contribution and they will decide if it is reason enough to let you keep all rights.
(devil speaking again) besides, what are you worried about, a blanket statement like: i hereby transfer all rights on my pike contributions to IDA will have not much weight in court, as they will interpret that as restrictive as possible, as transfering all rights is simply not legal.
greetings, martin.