Cal.com is transitioning from open source to closed source after five years, citing AI-driven security threats as the primary reason. The company argues that AI tools can now systematically scan open source codebases to find and exploit vulnerabilities at unprecedented speed, making public code a liability for protecting customer data. As a concession to the open source community, Cal.com is releasing a diverged version of its codebase under the MIT license as 'Cal.diy' for hobbyists and developers. The company frames this as a temporary measure, expressing hope to return to open source as the security landscape evolves.
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