Cal.com, which provides scheduling software, is moving its core open-source codebase to a closed repository, citing the dangers of AI hacking its open code
ZDNET's key takeaways — Cal is reluctantly moving away from open source for security. — This move isn't about Mythos, but risks from modern AI tools.
ZDNET Steven Vaughan-Nichols
Related Coverage
- Cal.com goes private: A security reckoning for open source The New Stack · Paul Sawers
- Cal.com Goes Private. What Are the Best Open Source Alternatives? Implicator.ai · Maria Garcia
- Cal.com Is Going Closed Source Because of AI Slashdot · BeauHD
Discussion
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@simonw
Simon Willison
on x
I'm certain this isn't the message they intended to present, but this comes across to me as a company saying “we no longer trust in our own ability to keep your data secure”
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@mjackson
@mjackson
on x
This is wrong. Open source isn't dead just because AI can more easily reverse engineer your codebase. AI can reverse engineer your closed source system just as easily. The solution isn't to hide the source. The solution is transparency, publishing advisories, and hardening.
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@migueldeicaza
Miguel de Icaza
on x
New excuse just dropped. You can use this for the next 4-6 weekend before people realize it was a crass move. Chop chop people!
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@johnonolan
John O'Nolan
on x
Thinking that going closed source is going to save you from the onset of AI is just delusional tbh. Yes, the world is changing. The answer is to change with it and figure out new ways to succeed, rather than make decisions from a place of fear of losing what you have.
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@xlr8harder
@xlr8harder
on x
Imagine being this wrong.
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@mitsuhiko
Armin Ronacher
on x
We have to close source because AI finds out security issues is a pretty weak argument honestly.
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@steipete
Peter Steinberger
on x
If you look at GPT 5.4-Cyber and it's ability for closed source reverse engineering, I have bad news for you. I do very much feel the pain though, there's hundreds of teams that try to poke holes into @openclaw. Our response has been of rapid iteration and code hardening. Which
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@pumfleet
Bailey Pumfleet
on x
Open source is dead. That's not a statement we ever thought we'd make. @calcom was built on open source. It shaped our product, our community, and our growth. But the world has changed faster than our principles could keep up. AI has fundamentally altered the security [video]
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@film_girl
Christina Warren
on x
this is what happens when you only use open source as a marketing invective anyway. because the concerns you have about code security don't disappear just because you close the source.