ilix.in is one of the most frequently used services to cloak and protect URL. The source code is encrypted which adds another layer to security. Once can protect a link or a collection of links with a password and share them safely in online communication lowering the odd that the traffic will be intercepted . Useful for sharing of demo pages , company docs, private photos....etc. They will show adds to the person who receive the links as that`s is their way to monetize the site .