This document discusses defensive publication as an advanced strategy to block future patents by purposefully publishing an invention to create prior art. Defensive publication provides an immediate, cheap, and anonymous alternative to the patent solution, which is powerful but slow and expensive. Research Disclosure is highlighted as providing a reliable defensive publication service that is fast, independent, searched by examiners, and stands up in court. Their service allows recognizing publication opportunities where patenting may be difficult or the expected benefits are lower than patent expenses.