(written from a Production point of view)
CBS Television Studios (formerly Paramount Television, CBS Paramount Television and its production arm CBS Paramount Network Television) is a television broadcasting company owned by the CBS Corporation (formerly Viacom) that currently holds the production rights of any future Star Trek television series. It is producing Star Trek: Discovery, released on CBS All Access on 24 September 2017. 
This company was formed as the result of a 2005 split between the Columbia Broadcasting System (CBS) and Viacom, the latter of which owned Paramount Television. It is currently a division of CBS Studios, which now owns the trademarks for Star Trek and all related marks, having it acquired from Paramount Pictures, meaning that after four decades, Paramount not only lost its television division, but in essence also the Star Trek franchise (only retaining a license through CBS to produce theatrical Star Trek films). The new Star Trek: Discovery television series marks the very first time that Paramount is entirely out of the loop of a Star Trek live-action show.
Having absorbed Desilu in 1967, Paramount Television laid claim to every episode of Star Trek: The Original Series and its subsequent spin-offs for nearly forty years before CBS Corporation acquired Paramount Television and merged it with CBS Productions. Paramount Television has never been a separate company within any of the holding groups, but a dependent division of Paramount Pictures until 2005. In late 2005, the former Viacom was split into two separate companies: CBS Corporation and a new Viacom, formalized on 17 January 2006. Paramount Television was initially renamed CBS Paramount Television officially. In 2009, CBS Paramount Television and its Network Television unit changed its name to CBS Television Studios.
CBS Television Studios consists of its domestic distribution arm, CBS Television Distribution, and its global distribution arm, CBS Studios International.