Amid an emerging rivalry between traditional pay TV operators and rising star Netflix Inc., CBS Corp.’s Showtime pay TV service confirmed Wednesday that back seasons of current original series like “Dexter” and “Californication” will not be available on Netflix’s streaming service as of this summer.

Instead, CBS will offer them to subscribers who pay for Showtime through Comcast Corp. on Comcast’s Xfinity TV platform.

The deal was in place for some time, but news of the deal broke this week after Netflix announced it was buying the right to debut the series “House of Cards” from executive producer David Fincher. Debuting an original series on its service makes Netflix even more of a direct rival to pay TV channels like Showtime and HBO.