This document analyzes ad blocking rates and the impact on video monetization globally based on a study of 1 billion devices from April to June 2015. Some key findings include: 62% of desktop video time in Germany is not monetized due to ad blocking, compared to 26% in the US and 43% in Canada. Time spent watching digital video is increasing rapidly across all ages and devices. The rise of ad blocking threatens significant lost revenue for publishers, estimated at 35% in Germany and 25% in the US. Ad blocking is highest in developed markets but is expected to grow substantially in emerging economies.