On the Variability Secrets of an Online Video Generator

We relate an original experience concerning a popular online video service that offers to generate variants of an humorous video. To further the understanding of the generator, we have reverse engineered its general behavior, architecture, as well as its variation points and its configuration space. The reverse engineering also allows us to create a new generator and online configurator that proposes 18 variation points -- instead of only 3 as in the original generator. We explain why and how we have collaborated and are collaborating with the original creators of the video generator. We also highlight how our reverse engineering work represents a threat to the original service and call for further investigating variability-aware security mechanisms.