CNNMoney: People using Periscope to illicitly stream HBO’s “Game of Thrones” to their friends are now on notice. HBO confirmed that it has sent take down notices to the Twitter-owned live video streaming service. Periscope, in turn, has reportedly taken action against the infringing account-holders. The case underlines a problem that analysts have predicted: the use of live video services like Periscope and Meerkat to pass along unauthorized streams of copyrighted programming.