looks like some pdfs you find with password protection might not be that protected at all: https://v12.sh/blog/the-case-of-the-9bit-aes-key

As I'm also part of the apple ecosystem since a while I'm as well quiet interested in what's going on. One of the major USPs I see, is the at least advertised end to end encryption for your cloud data, like photos documents and whatever you sync. What I didn't know: UK forced apple to change end2end encryption towards an encryption where they can offer access to government. Sounds like you should setup your Apple account outside of UK to be able to be protected or find other workarounds. I think governments who intrude their citizens privacy like that are failing.

https://gambit.security/blog-posts/autonomous-ai-agents-online-retailers-25-a-company