From Red Hat's Trademark Guidelines.
Copyright law protects the expression of an idea. When Red Hat develops new software, it owns the copyright
in the software. Red Hat® Linux® consists of hundreds of software modules, some developed by Red Hat
and many developed by other members of the open source community. Those authors hold the copyrights in
the modules or code they developed. At the same time, the combined body of work that constitutes Red Hat®
Linux® is a collective work which has been organized by Red Hat, and Red Hat holds the copyright in that
collective work. Red Hat then permits others to copy, modify and redistribute the collective work. To grant this
permission Red Hat usually uses the GNU General Public License (├óÔé¼┼ôGPL├óÔé¼┬Ø) version 2 and Red Hatʼs own End
User License Agreement. Although software licensed under the GPL is ├óÔé¼┼ôopen source software,├óÔé¼┬Ø Red Hat retains
ownership of the copyright in its collective work. If someone violates the GPL regarding that collective work,
only Red Hat, as the copyright owner and licensor of that collective work, has legal authority to enforce the
GPL against the violator. Although Red Hat ├óÔé¼┼ôowns├óÔé¼┬Ø the collective work, in licensing it under the GPL, Red Hat
grants broad rights in the collective work to others. Neither the GPL nor Red Hatʼs End User License Agree-
ment grant any right to use Red Hatʼs trademarks in the redistribution of the collective work.
From the GNU General Public License.
6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License.
It's the trademarks.