I must add this post https://plus.google.com/+gregkroahhartman/posts/WK6ZLEhfQo5 https://plus.google.com/+gregkroahhartman/posts/WK6ZLEhfQo5 Is it open source?

I must add this post https://plus.google.com/+gregkroahhartman/posts/WK6ZLEhfQo5 https://plus.google.com/+gregkroahhartman/posts/WK6ZLEhfQo5 Is it open source? "Yubico has replaced all open-source components that made yubikey NEOs so awesome with proprietary closed-source code in Yubikey 4s"