Its services gave Candiru, a spyware company blacklisted by the US government, and other surveillance firms access to advertising platforms run by Google, Comcast, Russia's Yandex, and others. An Israeli ad company, DiscoverTech, has for years been secretly helping spyware developers place their hacking software on popular websites, researchers say. Key points and original sources are listed below.

• Its services gave Candiru, a spyware company blacklisted by the US government, and other surveillance firms access to advertising platforms run by Google, Comcast, Russia's Yandex, and others.S1

• An Israeli ad company, DiscoverTech, has for years been secretly helping spyware developers place their hacking software on popular websites, researchers say.S2