Open Source Isn't Dead. Cal.com Just Learned the Wrong Lesson
Cal.com's decision to close its open-source codebase, citing AI-driven vulnerability discovery, sparks a heated debate about the future of software security. This article argues that "security through obscurity" is a losing battle against AI, advocating instead for AI-powered defensive automation. Hacker News commenters largely agree with the article's stance but often suspect business motivations rather than security are the true impetus for Cal.com's shift.
The Lowdown
Cal.com, a prominent scheduling software provider, recently announced its transition from an open-source to a closed-source core codebase. CEO Bailey Pumfleet attributed this strategic pivot to AI's enhanced ability to automate vulnerability discovery, framing open transparency as an "exposure" in this new landscape. However, Strix, an open-source AI security platform and the author of this article, strongly disagrees with Cal.com's conclusion, despite acknowledging the underlying AI threat.
- Strix, which specializes in autonomous AI security agents, affirms that it has been working closely with Cal.com on responsible vulnerability disclosure, validating the competence and dedication to user safety of Cal.com's engineering team.
- The article contends that closing source code provides no real defense against modern AI security agents, which excel at black-box and grey-box testing, capable of interacting with live endpoints and APIs without needing access to the underlying code.
- It dismisses "security through obscurity" as an outdated and ineffective strategy, especially when confronted by tireless, automated AI attackers that internal security teams cannot realistically outpace.
- Strix proposes that the effective solution is to "fight fire with fire" by integrating AI defenders directly into the development lifecycle, ensuring continuous, near-zero-cost security validation within the CI/CD pipeline.
- Ultimately, the authors maintain that open source is not dead and that accessible AI security tools are crucial for empowering developers to defend against AI-driven attacks.
In essence, while both Cal.com and Strix recognize the profound impact of AI on software security, they diverge sharply on the appropriate strategic response, with Strix advocating for enhanced AI-driven defense within an open framework rather than retreating to closed source.
The Gossip
Cal.com's Covert Calculations
Many commenters express skepticism regarding Cal.com's stated reasons for going closed source. While the article's premise focuses on AI security threats, a significant portion of the discussion posits that the real motivation is business viability, specifically the challenge of monetizing open-source projects, especially those backed by venture capital. Some suggest AI's ability to easily clone or replicate features from open code is a more direct threat to their business model than security per se.
Obscurity or Openness: A Security Spat
The core debate of the article, "security through obscurity" versus open transparency, is thoroughly dissected. Some users agree with the article's stance that hiding code offers minimal protection against sophisticated AI black-box attacks, noting that open source benefits from more "eyeballs" and community bug reports. Conversely, others argue that obscurity does provide a meaningful layer of defense by slowing down attackers and limiting their knowledge, citing examples like Cloudflare's closed-source anti-bot mechanisms.
AI's Automated Aggregation Angst
Beyond just code, commenters extended the discussion to the broader implications of AI for all forms of digital content. Concerns were raised that AI's ability to "slurp" and process vast amounts of open data will inevitably lead to content and code being pulled behind paywalls or proprietary licenses. This shift is seen as a defensive measure by creators to protect their intellectual property and business models from being exploited or devalued by AI technologies.