Preventing strangers from registering

[saintnick]

I have recently installed Coppermine on my site. Some friends and I are uploading our personal party pictures. I've already modified the code so that only registered users can see the photos, but anyone can still register.
So, I had this idea of a code word that you have to enter in a field when you register, and if the code word is wrong, the register process won't finish. There will just be one code word, the same for everyone, which I will give to the people I want to have access to the photos.
Is there any easy way to do this?

(I am terribly sorry if this question has been asked before. I tried searching, but I couldn't find anything.)

[kegobeer]

Why go to all that trouble?  Just don't allow people to register.  Simply make the accounts for your users and tell them the username and password.

[Tranz]

Not exactly what you're asking for, but here is one solution: http://forum.coppermine-gallery.net/index.php?topic=12216.0