HBO No Longer Sending Out Review DVDs To Limit Leaks 

Variety:

After years of mailing out DVDs to critics and journalists, HBO is shifting to a streaming-only policy for advance reviews of its programming.

The move had already been in the works but was accelerated by last month’s leak of the “Game of Thrones” season five opener, which made its way on to online piracy sites from an advance DVD screener.

Streaming video sounds equally susceptible to being copied and redistributed. Game of Thrones is so huge I think leaks are inevitable, unfortunately.