Jan,* an Avast threat researcher, is a huge football fan (soccer, to any Americans reading), and he’s always trying to find ways to stream games that are airing outside of his native Czech Republic. But during the first matches of the UEFA Champions League — the last match of which airs on June 10 — he was surprised by how many warnings were popping up from his Avast cybersecurity. Curious about what might be happening, he decided to take a closer look.