(written from a Production point of view)
The release of Star Trek: The Next Generation on iTunes began in 2013 with the release of the first season on the service. The Next Generation was the last show to appear on iTunes (the other four live-action shows were on iTunes a few years before.) Unlike the Original Series releases on iTunes, only the remastered version is available to purchase. As of December 2014, the first six seasons have been released.