Juan Caballero, Associate Research Professor & Deputy Director at the IMDEA Software Institute, gave an invited talk at Cybersecurity with the Best, the World’s biggest cybersecurity online conference for developers. Cybersecurity with the Best was held online on October 14-15, 2017. It comprised of over 40 talks by renowned international cybersecurity experts. Dr. Caballero’s talk was titled “The Rise of Potentially Unwanted Programs: Measuring its Prevalence, Distribution through Pay-per-Install Services, and Economics” and it described recent research performed by his group at the IMDEA Software Institute, in collaboration with Symantec Research, on potentially unwanted programs (PUP), a class of undesirable programs that affects a large number of Internet users.