access rights a file on server 2008

i have a excel doc located on the network drive that i want people to have view rights and than print it if needed... so i need to change the rights to read ONLY.. so i did and it works fine but for whatever reason they can save the file locally and than they can edit it as well... how can i fix this issue.. thanks in advance
MXU2011Asked:
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Jeff PerkinsOwnerCommented:
The only way I'm aware of to protect such files is using AD RMS (Rights Management Service)  
For a step by step guide, see this link:  http://technet.microsoft.com/en-us/library/cc753531(WS.10).aspx
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