what is red hat linux certification It is not "gratis", as it charges for doing the work in building from the SRPMs, and providing enterprise-grade support (the latter is obviously more important for their bottom line). If you want a RedHat without licence costs use Fedora, Scientific Linux or CentOS.A lot of what RedHat charges for is actually the support and services around the OS itself. They have their own specific config and build, but any Linux provider has that.
The real reason RedHat can charge is that their support services are appropriate at enterprise level. Their market space includes corporates and large organisations whose need for maintenance and support is significant. Most large organisations couldn't survive on in house IT in a cost effective manner.
To be a bit more specific, Red Hat does freely provide the source RPMs used to build the binary version of their distribution (the base ISO, updates, etc). You can grab all the SRPMs and build them, and you will essentially have RHEL. There are a number of projects that do just this (with some rebranding), notable CentOS, Scientific Linux, White Box, etc.
As Mikel notes, Red Hat is "libre", since it releases the SRPMs. It is not "gratis", as it charges for doing the work in building from the SRPMs, and providing enterprise-grade support (the latter is obviously more important for their bottom line).
Take a look at this Ars article on Red Hat's business model, and how it changed from the late 1990s/early 2000s to what it is today:
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