My company asked, and was told directly by Red Hat, that when you buy one RHEL license, you're allowed to install it to as many of your computers as you wish. However you will only get support for one installation per license. Therefore, for those users who don't need the official RH support (which I believe is the majority), the price of arbitrary number of RHEL boxes is the same as the price of one.
I do not know if it's permissible to freely distribute the RHEL ISO images (that is, to outside of the company who has bought a license). This, as far as I can tell, depends on if the ISO image contains any non-free software - or can there be other legal factors? Nobody seems to know for certain, but I would love to get a definitive answer to this.
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