[CentOS] Centos 7 License???

Today I did a yum upgrade to my kvm'ized Centos 7 test machine (perhaps a bad day to do such a thing) and received new kernel vmlinuz-3.10.0-229.1.2.el7.x86_64, among many other things. When I rebooted, I was asked to confirm (or renew, or some such) my license. My LICENSE ???

I was booting in text mode and the actions required were a) unfamiliar, and b) hard to understand.

As I recall, I had to read the EULA - a worrisomely Microsoftian demand - and accept it. Of course, the terms were pretty benign. Then I had to continue. I can't remember the exact language. Of course, now when I reboot, all this cruft is gone.

Is this a cute April Fool joke? If not, WTF is going on?