How to edit PDF?

['Forum Post]

In general, open-source software has good support for creating and
viewing PDFs, but not good support for editing them. Pdftk and
PdfRipImage are good for some things. It would help if the OP would
explain what exactly he wants to do and why. Normally the answer would
be that you shouldn't have to edit a PDF; if you need to edit something
that you received in PDF format, you should just contact the person who
created it about getting it in a more easily editable format, such as
tex, SVG (editable via inkscape), OOo, etc.


-- 
bcrowell