A method for processing document data by a data processing system includes storing a first electronic file containing document data which represents a document which can be displayed for a user; converting the first file into third electronic files which, in combination, contain document data of the first file representing at least one portion of the document; and providing the third files for retrieval, for displaying the at least one portion of the document by a user. According to the method, the document may be “fragmented” before being provided for display by the user.