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I know how make a PDF from LaTeX. Is there a way to extract the LaTeX-code from a PDF I created earlier? How about if someone sends me a PDF and I like the formatting. Can I extract the LaTeX from it?
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Go to Acrobat Reader's Edit/Preferences/General and un-check the box at the bottom that says “Enable Protected Mode at startup”. Or use a better PDF viewer such as Sumatra which works well with LaTeX and can synchronise TeX source and PDF.
LaTeX does not have a one-to-one conversion to PDF. With regards to your first question, I believe such a conversion may be technically possible, but I do not believe an application to do so yet exists. Similar to the way assembler can be decompiled back into high level language, there is probably a way to do it. However -- a pdf is allowed to contain all matter of kinds of data -- AutoCAD drawings, JPEG graphics, font files, forms, digital signatures, etc. LaTeX has no idea what these things are. So in answer to the second question is no -- there's not a way to extract equivalent LaTeX from any PDF document.
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