preventing client certs to be used by multiple users??

Conrad Friedrich <[email protected]>
Newsgroups gmane.comp.apache.mod-ssl.user
Organization unimatrix
Message-ID <[email protected]>
Hello,
Is there a way to prevent users (that got a client ssl-certificate (pkcs12) 
for accessing my server) from giving their certs away to others and in that 
way enabling "unwanted" users access to my site?
Or if there is no elegant solution, maybe someone knows how apache (or a log 
analyzer etc.) can inform me if two different IPs have tried to connect 
simultaneously using the same certificate?

Many thanks
Conrad Friedrich
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