Greyball is a software tool developed by Uber and used to idenitfy and deny its services to certain riders. This includes riders that it suspects of violating its terms and conditions. The software can hde the standard city app view for individual riders, this enables Uber to show that same Uber rider a different version of the city view. Uber claimed it was using Greyball to show suspected riders who it felt may violate the terms of use, people seeking to plae harm onto Uber operations and those who wanted to carry out law enforcement on its Uber drivers. Greyball used several methods to identify and deny its services to Uber riders: 1.) Uber would create an internal digital map showing the locations of government buildings in the area. If a rider were to hail a ride from the area surrounding the government building, Greyball would flag th rider as a possible law enforcement agent. 2.) Greyball would determine how many times the Uber app had been opened and closed without hailing for a ride, alingside a Geofencing technique this would flag the rider as a potencial offcial. 3.) Social Media vs. Uber Profile. Uber employees would use techniques such as reverse image searches to find out if Uber profiles were in fact government officials posing as riders. 4.) Uber would search credit card databases to find out if riders cards were in fact linked to government or police agencies. Transport for London (TfL) said that the use of Greyball was one of the reasons for its decision not to renew Uber's London licence.