Remove Amazon DRM from an Internet downloaded pdf eBook

Hello, I downloaded a rare eBook from the Internet in pdf format and it’s full of Amazon DRM crap in all versions I’m able to find it, when I open the file it asks for Internet connection to Amazon, but it does nothing with or without connection.
I have researched the issue and there are several programs that allow you to remove DRM from your own purchased books, but you need your own “key”generated from another DRM crap called Adobe Digital Editions, I tried Calibre+DeDRM and ePUBee DRM Removal (the second it’s based on the first) but they need the unique key to operate.
Is there any possibility to get the key or bypass it? Or is there some program able to crack all this DRM crap?
Answer #1
You see that often. You’d probably find that even if you could open the downloaded file, it wouldn’t be your book.
They’re more like spam or a marketing link than an actual protected book.
Your best bet is to post in requests and hope someone can upload it or find an actual working link.
Answer #2
Thank you, a few years back you could just type “download X pdf/txt” in a search engine and get the real thing on the instant : (