Have you considered a torrent based solution?

Setup a torrenting server hosted online somewhere with fast speeds (e.g. Netherlands), sync it with gdrive, create a torrent for your books, and “download” your books to the toreenting machine.

This approach won’t help with upload speed, but it should help with reliability/continuity. As long as you seed from your home computer, your books will eventually make it into your gdrive.

Although with this setup it might be easier to just torrent the ebooks to the online server from sources other than yourself.

Image poisoning’s general principle is to change pixels in a way were our eye can’t notice, but that screw up the labeling by LLMs.

You can probably try to apply the same principle, poison the PDF in a way that only humans can read it.

Thing is, I assume you distribute your content on PDFs to make the content accessible to humans. That usually means having the text embedded for easy copy-paste and similar methods. Poisoning these might end up being counterproductive for your objective.

All this to say that No, I have no idea of a poisoning algorithm for PDFs

TLDR; Use poker decks to clone 3 sets of Love Letter

I’ll recommend some boardgames.

Once you go over 7-8 players, the options are greatly reduced. The available genres become (mostly) limited to social deduction

Social deduction, all about trying to figure out other peoples cards. And lying, lots of lying.

• Love letter, 6 players, 20 cards, ~13 tokens, for points
• Avalon, 7-10 players, ~30cards, tracking mat/paper
• Secret Hitler, 7-10 players, ~30 cards, tracking mat/paper, has a print-at-home version.
• Ultimate werewolf/vampire/etc, ~10-12 players, ~13-15 cards, phone app (for narration, free)

*None of the above are very good for playing as teams (i.e. two ppl taking a single player spot)

Group Games games that do well with teams

• Codenames, various versions.
• Forbidden Island/Dessert/Sky - co-op game for various number of players

As a special mention, Challengers is a board game that allows you to create simple yet fun card drafting tournaments. There are two editions, each allows you up to 8 players, and if you have both they can be combined into 16ppl tournaments

For your numbers, you’d need to buy 2-3 copies of the same game. Not ideal, even if you have the budget.

I’d say, print yourself three copies of Love Letters, you can find the cards online, or just play with 2-3 poker decks. Its the best game in my library, simple yet deep. We’ve been playing it at least once a week for 3 years now. I’ve even managed to play once with a mob of disinterested teens ;)