When doing an extensive search, I always get blocked with this message; We apologize for the inconvenience: to prevent possible abuse of our service, your ability to connect to Startpage has been suspended at this time.
This happens when a large number of search requests are received from a particular internet connection during a short period of time. Screen scraping software may trigger this, as would a connection shared by many people at the same time, for example a VPN server or through Tor. Often, this can be resolved by connecting through a different server through your VPN provider or by connecting through a different Tor exit node.
It sucks.