I have read Apple documentation:
I have also read this thread:
Non-Apple Issued Code Signing Certificate: Can it Work with Mac OS 10.8 Gatekeeper?
Both clearly state that third-party CA code signing certificates won't work with Apple OS X.
However, various CAs offer Apple code signing certificates for sale. Couple examples here:
https://www.digicert.com/code-signing/apple-certificates.htm
https://www.thawte.com/code-signing/content-signing-certificates/apple/index.html
There are other companies too. Which creates an impression that it is indeed possible to use a variety of certificaes with OS X.
These cannot be both right. Is there any explanation to the situation?