Few thoughts :
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1. EULA in the registration can be a good idea.
2. Since it is somewhat technical list, a simple questionnaire from a pool of question
is likely to discourage most of spammers, something like :
What is your favorite text manipulation utility : A) ld B) awk C) ln D) ash
(mine is C). It requires some programming probably.
3. A ratification will be ask every couple of months. If it is not replied (correctly) after
two weeks, the user will be unregistered. It should skip on-vacation users and so on.
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