Why is Ranbir installing cctv cameras outside his home

Our sources have confirmed a report that Ranbir and Katrina are installing a cctv camera outside their building. Eversince the couple has moved in a live-in relationship the media is not taking a breath. Papparazi is virtually always sitting outside their home. This is irritating the couple no end. In the meantine lot of Bollywood biggies are visiting their sweet home. Aamir,Kiran Rao, Aditya and Siddharth Roy Kapur were seen recently outside their home