The present invention relates to a securing method for an electronic document, and more specifically, to a securing method for an electronic document written by a plurality of writers. The securing method for an electronic document according to an embodiment of the present invention comprises the following steps of: dividing an electronic document into partial electronic document fragments to correspond to the number of a plurality of writers; and transmitting each of the partial electronic document fragments to each device of the writers one by one such that the partial electronic document fragments are not overlapped. Therefore, no one of the writers is allowed to have the electronic document, and when the electronic document written by the writers is edited, one among the writers cannot open or edit the electronic document by oneself. Accordingly, the securing method for an electronic document of the present invention has an effect of improving security of the electronic document without a password.;COPYRIGHT KIPO 2016
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