Cal.com Goes Closed Source: Why AI Security Is Forcing Our ...
After five years as open source champions, Cal.com is going closed source. This wasn’t an easy decision, but in the age of AI-driven security threats, protecting customer data has to come first.

Cal.com is going closed source with a major shift in its ...
The scheduling platform Cal.com has launched v6.4, introducing a major shift in its open source license model. Citing the growing impact of AI coding tools and the risks of exposing public code, the company is moving its commercial edition to a "closed source" model after previously offering it as "source-available".

Cal.com closed its source code. Here's what the security ...
Cal.com closed its 30,000-star production codebase on April 15, citing AI vulnerability scanners that make open-source code five to ten times easier to exploit.

Cal.com goes private: A security reckoning for open source
Cal.com moves its core codebase to a closed repository, citing AI security risks. Discover how the startup balances open source roots with vulnerability concerns.

Cal.com Goes Closed Source: What the AI Security Shift Means
Cal.com is maintaining an open-source version called Cal.diy aimed at hobbyists and self-hosters who want an open scheduling solution. This approach preserves a channel for developers interested in tinkering while moving the core business-focused product to closed source for enhanced security.

'Like handing out the blueprint to a bank vault': Why AI led ...
Cal is moving its flagship open-source program to a proprietary model because it can't cope with the dangers of AI hacking its open code.

Cal.com Goes Closed Source: AI Security or Business Move?
The Precedent That Matters Cal.com is the first major commercial open source project to explicitly cite AI threats as the reason for going closed. If this strategy works—if enterprise customers accept the security rationale and Cal.com’s business thrives—expect others to follow. The global open source software market is worth $49 billion.