I think the "careful chooser of segments" tool risks defeating your defense based on fair use because it embodies an intention to deliver the complete work.<p>For that to work what you would need is an annotation protocol reviewers would adhere to (hash, start-end) that could allow a downloader to locate the missing pieces. The locator tool would also have to be designed in such a way not to ruin the fair-use defense too.<p>This is not a trivial problem and, I must add, we are talking about a tool designed to violate copyright laws and to get away with it.<p>It would be much wiser to direct our efforts towards a more rational copyright system instead of trying to break the law.