As usual, this is another quality Phoca component. It's easy to setup, easy to use and it looks good also. My minor suggestions for future versions are:
(1) If Captcha is going to be case-sensitive as it is now, there should be a message regarding that somewhere as it is not the expected Captcha behavior.
(2) The grammar needs some serious work. There are commas all over where there shouldn't be and the English is mediocre at best. Perhaps someone could help translate it a bit better.
(3) The math Captcha is a bit odd and could use some instructions for users. In my test pool, some people were trying to enter the equation itself. lol I know, I know. Typically math is displayed in plain text though so the novice internet users might need a little assistance.
I have already rectified these issues on my site as they are easily sorted but I just thought I would mention them. Again, they are minor issues and this extension is very good.
Thank you for another nice component.