What does HTPBE? stand for, and how do you pronounce it?

HTPBE? stands for Has This PDF Been Edited? — it is the product name, not a random code.

How to say it: pronounce it letter by letter: H-T-P-B-E (like “FBI” or “API”). That is the clearest option for calls, support, and demos because the letters do not spell one obvious English word.

For what the service actually checks, see What is HTPBE?, and what does it do?