It's not illegal to carry a firearm loaded and exposed in California if you have the proper license issued by BSIS, which is separate from a CCW.

That license is only applicable in specific circumstances, e.g. like for uniformed security guards.

Which solves the problem of needing armed guards.

You do in California. Please don't assume every state has the same laws.

No you dont. It would be silly if you needed a license to open or concealed carry on your own property. That would make it impossible for most Californians to perform gun maintenance at home or defend themselves from an intruder.

Here's a decent summary from Gabby Giffords mentioning the right to carry at home and at work (requires permission of business owner but NOT necessarily landlord): https://giffords.org/lawcenter/state-laws/location-restricti...

If you wanna go straight to the source, section 26035 of the CA Penal Code is a good start:

"Nothing in Section 25850 shall prevent any person engaged in any lawful business... or any officer, employee, or agent authorized by that person for lawful purposes connected with that business, from having a loaded firearm within the person’s place of business"

25525 PC is also relevant as it reiterates the home & business exemption to concealed carry laws

The problem is you're looking at one statute in isolation and not how courts have interpreted it in concert with other statutes.

Yes, sometimes you can lawfully open or concealed carry on your own property without needing a permit. But if it's open to the public, you need a permit.

http://wiki.calgunsfoundation.org/index.php?title=Unlicensed...

Does Apple's campus meet that standard of being a quasi-public place? I think it's fenced in and access is by invitation only