Code signing is becoming increasingly important for software developers and publishers to establish trust with customers and distribution platforms like mobile networks and Microsoft, and to deter the proliferation of malware. It provides assurances to customers by verifying the identity of the publisher and confirming the code has not been tampered with. Microsoft's SmartScreen filter blocks unsigned code, deterring users, while Symantec's EV code signing closes gaps to keep malware out and gains immediate reputation with SmartScreen. Code signing benefits developers by maximizing distribution, reducing security warnings, protecting code integrity and reputation, and speeding time to market.