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We had this question before (should be in the mailing-list archive).
This is neither default nor optional Trac core behavior, and due to
permission definitions on 'project level' it would require
a) authentication prior to/at the project listing page
b) checking permission for each project by reading their Trac db
for every access to the project listing
As your boss or yourself, what it is really worth. It could be done by a
separate script. Don't remember yet, if someone already published a
solution before, sorry.
Steffen Hoffmann
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