Group. In the late 1990s, Warner Bros. obtained rights to the Harry Potter novels and released feature film adaptations of the first in 2001. Subsequently, they released the second film in 2002, the third in June 2004, the fourth in November 2005, the fifth in July 2007, and the sixth in July 2009. The seventh (and at that time, final) book was released as two movies; Deathly Hallows — Part 1 in November 2010 and Deathly Hallows — Part 2 in July 2011. From 2006, Warner Bros. operated a joint venture with China Film Group Corporation and HG to form Warner China Film HG to produce films in Hong Kong and China, including Connected, a remake of the 2004 thriller film Cellular. Warner Bros. played a large part in the discontinuation of the HD DVD format. On January 4, 2008, Warner Bros. announced that they would drop support of HD DVD in favor of Blu-ray Disc. HD DVDs continued to be released through May 2008, but only following Blu-ray and DVD releases. Warner Bros.' Harry Potter film series was the worldwide highest-grossing film series of all time without adjusting for inflation. Its Batman film series was one of only two series to have two entries earn more than $1 billion worldwide. Harry Potter and the Deathly Hallows – Part 2 was Warner Bros.' highest-grossing movie ever (surpassing The Dark Knight). However, the Harry Potter movies have produced a net loss due to Hollywood accounting. IMAX Corp. signed with Warner Bros. Pictures in April 2010 to release as many as 20 giant-format films through 2013. On October 21, 2014, Warner Bros. created a short form digital unit, Blue Ribbon Content, under Warner Bros. Animation and Warner Digital Series president Sam Register. Warner Bros. Digital Networks announced its acquisition of online video company Machinima, Inc. on November 17, 2016. As of 2015, Warner Bros. is one of only three studios to have released a pair of billion-dollar films in the same year (along with Walt Disney Studios Motion Pictures and Universal Studios); the distinction was achieved in 2012 with The Dark Knight Rises and The Hobbit: An Unexpected Journey. As of 2016, it is the only studio to cross $1 billion at the domestic box office every year since 2000. AT&T subsidiary In June 2018, Warner Bros. parent company Time Warner was acquired by U.S. telecom company AT&T, and renamed WarnerMedia, the