CAPTCHA(Completely Automated Public Turing Test to tell the Computers from Human Apart)
1. Must not allow user to copy/paste it.
2. It must not have dictionary words(so that it is difficult for hacker make computer guess)
3. It must not have offensive words(normally won't be, just in case.)
4. It must be random. It must display new image once invalid one is submitted.(AJAX implementation will be user friendly, so that it doesn't wait for user to refresh the page manually).
5. It must be case sensitive(based on rqts.)
6. Must provide audio to help visually impaired people.
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