These are books which were replaced by the current editions of Extreme Privacy (5th Edition) and OSINT Techniques (11th Edition). Much of the content here is redundant and outdated. Some readers have requested that we offer these books which are technically "Out of Print", as they offer alternative content and flow. However, this comes at the cost of potentially outdated information. For most readers, we only recommend the "Current Books", but respect that some may want these previous versions.