I have some good PDF ebooks I'm willing to share, but I suspect the seller embeds some tracking data in them to link them to my account, as every time I download them from the official website they have a different hash while being visually identical. The same when checking against the copies a friend bought from the same seller. Since I dont wanna get banned, can you recommend a way to remove that stuff?
You can also check Z-library. If you can't find what you are looking for and you know that an ebook version exists I may be able to get a copy of it, feel free to mail me (see address and GPG key on my profile).