While using Google Maps, you’ve probably come across parts of the map that are either blurred, whited out, or pixelized. It’s no mistake, those areas are actually blurred on purpose (most of the time).  They blur out spots on the maps that are considered to be sensitive like military bases, certain government buildings, nuclear power plants, etc.

Wikipedia is taking new steps to help prevent "indirect" vandalism.  Software has been created and is in use on the main page.  It's called "Cascading Protection" and it applies to local images and templates which are typical targets for vandalism. Andrew Garrett created this, and on his blog explains in a simplified way how it works: