There was a version number at the very bottom, and a link to how to maintain versioned documents. There was the mention of opening PDFs in browsers or with some apps that sandbox the PDF. They were like a hacker collective or a couple of hackers. I believe they were dutch, but this could be wrong.
Thanks for pointing it out. I’m also aware of their reliance on surveillance capitalism services. Maybe I should’ve pointed that out, in case someone mistakenly looked at the site uncritically. I just liked the fact that they were the first to point me towards how to maintain a change log. But, in any case, thanks for making the public service announcement!