Peacefire is primarily concerned with free speech rights. The authors on the site have been opponents of web content filtering and content-control software, which they refer to as censorware or blocking software. They have offered numerous methods for defeating common web filters, and this has drawn some interest from the Internet community. The site has conducted long battles against the most commonly used filter programs, including, most famously, Net Nanny, CyberPatrol, and Bess. In particular, Peacefire has demonstrated that the filter programs suppress political speech and filter preferentially for corporate and conservative causes. In other cases, Peacefire has presented evidence that several filtering programs block some websites without having a human being review those sites first