Privacy & cookies
Your choices
Optional conversion measurement is off by default. Use Privacy preferences in the footer to allow it or withdraw your choice at any time. Do Not Track and Global Privacy Control disable optional measurement.
Storage and optional measurement
A first-party preference cookie remembers your choice for up to 180 days. Local storage remembers your theme and signals teaching activity between open tabs. Optional measurement stores only daily counts for software links, publication links, book links, and successful contact messages. It does not store visitor identifiers, IP addresses, full URLs, search terms, or form contents. Counts describe actions, not unique people or completed purchases. Daily optional counts are removed after 180 days.
Teaching activity and requests
The teaching library separately counts presentation views, viewing time, PowerPoint requests, and downloads started. Short-lived sessions use rotating keyed hashes of network and browser information; raw IP addresses and user-agent strings are not retained in those records. Session records are removed after 30 days. Request email addresses are used to notify the site owner and send approved PowerPoint downloads through Resend. Private review links expose only their individual request. Pending requests are removed after 90 days and all request records after 180 days. Aggregate teaching totals are retained. Optional measurement preferences do not control these existing teaching functions.
Form abuse prevention
Contact and PowerPoint forms use keyed hashes of network addresses and email addresses to enforce submission limits. These security records are kept for up to 48 hours, including daily cleanup, and contain no message text or raw network addresses. Short burst limits also protect file access. Shared networks may share a limit.
Contact and third-party services
Contact details are used to reply to correspondence and delivered through Cloudflare email. Resend processes PowerPoint request notifications and approved download emails. Do not submit patient-identifiable or other sensitive information. Cloudflare provides hosting, security checks, and infrastructure request processing. SlideShare presentations open on SlideShare. SlideShare, Amazon, GitHub, and publication websites handle visits to their own sites under their own policies.