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meta backend and substring searches

Is it possible to disallow a substring search without changing the schema?

A bit more background:
I set up a meta backend connecting to different servers.
Read access is only allowed for cn and mail and userCertificate.
For I don't want any user to get cn's or mail-addresses by a substring search I want to disallow it, so a user have to know the complete cn or mail-address to get the attributes. It can easily be done by deleting the SUBSTR filter in the schema.
But is there another way?
BTW: sizelimit 1 is not what I want.


Armin Wenz