Intra-ISP spyware are behavioural targeting advertising systems that sit within an ISP in order to scan the content of web browsing and build a profile of your interests so that relevant adverts can be sent back to you. Also known as IISpy, or I2Spy systems
The spyware system implemented by the company Phorm is installed within the UK ISP BT and therefore classed as Intra-ISP Spyware.