IC products often have lifespans of 10–20 years (automotive, industrial, aerospace). Plain PDFs from 2005 open perfectly today. Interactive web tools from 2015 may already be defunct.
If you have an IC Plain PDF and need text searchability, you must run OCR: ic plain pdf
To deliberately destroy the text layer:
The exam is typically divided into modules (like P1) that focus on basic financial knowledge, ethics, and the regulatory environment of the Securities and Exchange Commission (SEC) Thailand . IC products often have lifespans of 10–20 years