What is "cydoor"

Cydoor Desktop Media is an Israeli adware company. Cydoor originally placed ads only in software programs such as Kazaa and iMesh, but has now expanded into running ads on websites as an advertising network.

Because of Cydoor's highly controversial practices of running ads in software programs, Cydoor software is often considered spyware — and many Anti-Spyware and Antivirus applications will flag the software as such.