"The transfer of exclusive rights is not valid unless that transfer is in writing and signed by the owner of the rights conveyed" [1] Therefore, if no papers w

"The transfer of exclusive rights is not valid unless that transfer is in writing and signed by the owner of the rights conveyed" [1] Therefore, if no papers were signed, then the developer retains rights to license their work to others. [1] http://www.bitlaw.com/copyright/license.html http://www.bitlaw.com/copyright/license.html