Hi all .
I would like to try & finally buy redhat license for my home system.
Some questions are around :
1 ) How much money a standard x64 support pc takes for buying redhat license?
2 ) The money from customer is only for recieving updates for new softwares & so forth ?
3 ) What are the differences between a CentOS linux & RedHat Linux, can a CentOS takes places instead of RedHat? actually, what are benefits around using RedHat instead of other Free distributions ?
4 ) Does the RedHat service provide it's services for iranian people who bought their OS or they are forbidden according to some policy points ?

thanks .

Most of your questions can be answered at http://redhat.com or by contacting Red Hat customer service.

3) CentOS is built from Red Hat sources and is 100% compatible. If you don't want to pay for Red Hat, CentOS is an excellent choice.

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Cent right now is a bit slow in development
red hat released RHEL 5.6 then RHEL 6.0
centOS is at 5.5 and when 5.6 will be out ??? who knows a guess is 3 to 6 months ?
THEN and only then will work on centOS6 start

you might want to look into Scientific Linux 6
it is supported by the USA's FermiLab and CERN
http://www.scientificlinux.org/