svn:external question

Hello,

how do I define that all external of my repository are read-only for
everyone? It should never be possible to change/commit changes through
an external. Can I do this with subversion?

Here is an example:
- two projects "calc" and "paint"
- User A have no rights to read or edit on project "calc".
- He must work on "paint" which has "calc" as external
- Now user A must get read access for "calc" through "paint"

-- 
Regards,
Enrico Straube
mailto:enrico.straube@cbb-software.com
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