The local_aplpdf plugin is a shared dependency of many APL plugins that provide PDF generation. Moodle core pdf implementation has several limitations that make difficult some operations such as generating multiple page documents.
This library provides an alternative version of TCPDF, encapsulated with a technical helper to pilot PDF generation in a more simple way.
Additionnaly, we assemble other libraries that have PDF concerns, and may be usefull in the future, such as mergePDF, pdf2svg, xpdf, etc.