Derivation Process
When an item is uploaded to the Internet Archive, a number of automated processes are kicked off, and gradually complete over time. One of these is the derivation process, which converts original file formats into other ones that are easier to view or otherwise more useful.
- https://help.archive.org/hc/en-us/articles/360014487651-Files-Formats-and-Derivatives-A-Basic-Guide
- https://archive.org/help/derivatives.php (big, automatically updated list of formats derived)