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[Data]

Yes, I could make the forum member-only, BUT that would also carry one other unwanted effect. If every person that wanted to ask a simple short question or leave a comment had to register, we would have thousands of inactive members now. I wish to avoid this. I'd rather have a small active member base, than a large one with only a few people actually being active.

Good point. I have never looked at it that way.

[unclefester]

Data means when you first register, not every time you want to log in.

Never seen that. Mayb because this the second time I've register in a forum :?

[Omuletzu]

@Unclefester it is a quite popular method actually
If you are subscribed to yahoo mail, then you have filled out a form with this protection.That's the only site i remember right now, but there are a lot of sites that use this protection

[Havell]

The Underdogs make you use it every time you want to download a file.