Note
The particle で functions as a means or method marker here, indicating the manner or state of the document. It is used to ask if being in the form of a copy is acceptable or sufficient for the purpose at hand.
Breakdown of kono syorui ha kopii de ii desu ka?
ですdesu
to be
はha
topic particle
かka
question particle
このkono
this ... adnominal
いいii
good
書類syorui
(official) document
でde
method/means particle
コピーkopii
copy
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