Sophos Web Protection provides enhanced protection against web threats. It includes several features, such as live URL filtering, scanning of downloaded content and checking of the reputation of downloaded files. Live URL filtering blocks access to websites that are known to host malware. This feature works by performing a real-time lookup against Sophos's online database of infected websites. Content scanning scans data and files downloaded from the internet (or intranet) and proactively detects malicious content. This feature scans content hosted at any location, including locations not listed in the database of infected websites. Download reputation is calculated based on the file's age, source, prevalence, deep content analysis and other characteristics. By default, an alert will be displayed when a file with low or unknown reputation is downloaded.