sentences:  The first public demonstration focusing exclusively on the engine took place at QuakeCon in the same year during the annual keynote held by John Carmack.An interview with John Carmack, the lead graphics engine developer at id (at the time), indicated that like its predecessors, id Tech 5 would eventually be released as open-source.The move to open source would likely come many years after id Tech 5's release as a proprietary engine.