A U.S. District Court judge has ruled that users cannot legally resell songs they have purchased on iTunes, reports All Things D. The case in question is a lawsuit between Capitol Records and music startup ReDigi, which wants to create a marketplace for owners of digital music to sell their libraries. ReDigi argued that 'first-sale doctrine' should apply to digital purchases in additional to physical ones, but the court did not accept that argument. First-sale doctrine holds that individuals are able to sell their legally purchased books or