Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Secure phonelines and codenames are usually the preserve of governments and secret services. But when it came to Game of Thrones spoilers, the producers of the fantasy mega-hit weren't taking any chances, as the woman who made its official behind-the-scenes documentary found out.

Game of Thrones: Behind-the-scenes documentary's top secrets