Hi, This is the presentation which was delivered on Drag and Drop CAPTCHA, in IEEE International Conference Indicon 2009.
This paper basically displays new approach to CAPTCHA and avoid possible threats against the laundry attacks and OCRs.
You can find the Research Paper of IEEE at IEEE Xplore.
And for more information check the updates on: http://dndcaptcha.blogspot.com
For Educational or technical reason you may directly mail me on email@example.com