Please check out Google's excellent page where you can learn more and sign an online petition against this pending legislation in the US.
Currently, there's no one in the world that can take down any website. At best, you can pursue local laws against hosting providers for a site you want taken down. If this legislation goes through, someone (i.e. Facebook) could throw some dollars at some lawyers and politicians, and get a "on/off" button to kill, let's say Google Plus service, with complete disregard for any judicial process.
This affects every single person reading this page. If Sencha disagrees with my message here - tough luck. It's a free Internet. If PIPA/SOPA goes through, Sencha could have this page taken down in a flash, using nothing but money.
I urge you to spread awareness of this message! Share this post!