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"It is proven that all the sequences of digits are present somewhere in these digits"

This has never been proven for the digits of π. Of course, there are other digit-sequences for which it is trivially true. For example, just concatenating together every finite sequence of digits, in some suitable order.

I stand corrected. For pi, it is only a conjecture. My point remains true for "Champernowne sequence".

Without being any kind of copyright expert, this argument doesn't make much sense. If you have the relevant indices into pi, I guess you could claim copyright. The index will be much larger than the original book though. Essentially you have a really bad compression algorithm. I'm not going to get very far claiming that because my decompression algorithm could output any sequence, all sequences are mine.

It has already been done (even though it is only a conjecture):

https://news.ycombinator.com/item?id=13869691