Concert operators may like Amazon's palm recognition system, but some performers and activists are less than thrilled. A group of 200 artists and 30 rights groups has penned an open letter demanding the Red Rocks amphitheater, its ticketing provider AXS and AEG (AXS' parent company) "immediately cancel" contracts to use Amazon One scanning at any venue. They also want the firms to ban all biometric surveillance at those events. The opponents to Amazon's palm tech include figures you'd recognize, such as Rage Against the Machine's Tom Morello and Bikini Kill's Kathleen Hanna. The groups include organizations ranging from the immigrant-oriented United We Dream through to the Tor Project.