Abstract: The present invention relates to a system for the preparation of an extended, two layer document, said extended document forms a single package which comprises a text document and a meta-data layer program attached to it, said system comprises a meta-data layer editor, which in turn comprises: (a) a document connector module for receiving a text document, and for parsing the document to document elements; (b) rules editor for defining rules concerning the content of each meta-data layer element, rules concerning to the form of appearance of each meta-data layer element, and action rules concerning conditions for activation of meta-data layer elements, wherein meta-data layer elements correspond to selected document elements of said locked text document; (c) program generator for generating from said rules an intermediate meta-data layer program; and wherein said system further comprises at least one converter for receiving a copy of said locked document and also receiving said intermediate program from said p