What is the relationship between CentOS and Liunx? What is the relationship between CentOS and RHLR?

What is the relationship between CentOS and Liunx?       

Liunx has three major distributions: Slackware, Debian, Redhat. CentOS is one of the many distributions in Liunx. RedHat has a paid commercial version and free open source version, the commercial version of the industry called the Rhel (RedHat Enterprise Linux) series, and this CentOS (Community enterprise Operating System) is compiled from the source code released by Rhel in accordance with the open source rules. CentOS can be used instead of the commercial version of Rhel. The difference between the two is that CentOS does not contain closed source software, that is, free.

What is the relationship between CentOS and RHLR?

There are two ways in which RHEL is released. One is the binary distribution method, the other is the source code distribution mode.
Either way, you can get it for free (for example, download it from the internet ) and publish it again. But if you use their online upgrades (including patches) or consulting services, you'll have to pay.

Rhel has always provided the source code for the distribution, CentOS is the source of the RHEL release from the new compilation, the formation of a binary version can be used. Since the source code for LINUX is GNU, it is legal to get the source code from RHEL to the new binary. Just REDHAT is a trademark, so you have to remove REDHAT's trademark in the new release. REDHAT's attitude to this distribution is: "We are not really against this distribution, the users who really pay us, they value not the system itself, but the business services we provide." "So, CentOS can get all the features of RHEL, even the better software. However, CentOS does not provide commercial support to users and, of course, is not responsible for any business.

What is the relationship between CentOS and Liunx? What is the relationship between CentOS and RHLR?