It's always good practice to anonymize data. Registrar identity seems ok 
to me.

Nicolas

On 17/11/2011 10:58 AM, Marc Perkel wrote:
> Just a general question about whois data. I'm thinking about starting 
> a project to slowly mine the WHOIS database and publish the data 
> through high speed DNS for the purpose of using it for spam filtering. 
> Mostly interested in associating domain name with their registrar and 
> returning information on the age of the domain.
>
> Is there anything improper or illegal about doing this?