Re-typing a password every time you open a statement gets old fast. If you know the password, this produces a copy without it, so the file opens normally from then on.
Strip the password from a PDF you can already open.
No, and it isn't meant to. This removes protection from documents you can already open — it is not a password cracker and won't bypass one.
Edit PDF
Open a PDF and edit the text directly, keeping the exact layout, fonts and page size.
Merge PDFs
Combine several PDFs into a single document, in the order you pick them.
Split / extract pages
Pull specific pages out of a PDF into a new document.
Compress PDF
Reduce a PDF's file size by cleaning up unused objects and metadata.