Crawler module for drupal

I am building an automatic dmca sending website, where the user can input a title of for instance an ebook, the site then lists the torrent sites that offer this book. And gives the option to automatically send a dmca email. I need a Drupal 7 module with this functionality, I will take care of the rest of the site (checkout etc) myself. Please read the attached pdf for details. Also please include a motivation with your bid and a short description on how you would implement this.