OK, I'll try to answer my own question.

I've been looking into the structure of PDFs while playing around with the 
"InspectPageContent" example from chapter 15. Font size, position, etc. seems 
to be defined by a group of tokens like "Tf 12 0 0 12", where "12" defines font 
size (width and height, I suppose. No clue about the zeros...). If the text is 
vertical, the same group would look like this: "Tf 0 12 -12 0". I've also found 
one PDF where "Tf" is substituted by "BT".

I've made a small script where I use PRTokeniser to go through the tokens of 
each page, and where it find the right chain of tokens, it rotates the page 
using the example from chapter 13.

Is this the right approach? It works perfect (so far...), but I don't know how 
reliable it is. Am I reinventing the wheel?

Thanks,
Pedro
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