[MyPasswordSucks]

> Reading the QR code spec (or even just the wikipedia page) could help a lot here.

Comprehending what you read could help a lot, too.

The output data generally isn't repeated even a single time in full, let alone "lots of times". That's what error correction keys are for.

The fact that you can stick a logo in the middle doesn't have much to do with anything. I can (and many publishers have!) put a bunch of color pictures in the middle of a book, it doesn't mean the data in the book is repeated.