'Quicklook thumbnails.data parser' (Mari DeGrazia).The fact that QuickLook caches thumbnails of file contents is well known, especially in forensics circles.
In this guest blog post, Wojciech Reguła ( discusses (with some additional content from yours truly), how macOS will cache (in the clear!) the names and thumbnails of files contents, even if when such files are stored within a password-protected encrypted container. unfortunately marketing claims and reality are sometimes at odds. every Apple product is designed from the ground up to protect that'
Apple states that: ' we believe privacy is a fundamental human right.