redhat licensing

[Sujitkumar Shirkar]

Hello all,
 
I would like to know 
do i need to buy RHEL 4, Update 4 license if i have to use it for production purpose? 
We have download from the net and it is working fine, then do i need to buy license?
If i have 100 system installed with RHEL4 Update 4 and if i i buy only one RHEL subcription will it work for all 100 systems?
 
Please advise
 
With Thanks and Regards
 
Sujitkumar Shirkar  
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