It allows users to access the required data / file/ document

                but they can't modify. Only read.

                 The valuable information that we provide is accessible to the user, but one

                 can't modify it. This includes non changing info., non deleting, non adding

                 in all font, format, pics, tables, frames, ...

                 Other forms of protection incase of a website (html files) is the ability of

                 prevent saving by all its means. This includes: (a) prevent stealing java scripts,

                 html codes, (b) copying content within, pics, animations,... (c) prevent saving

                 of the whole file (d) prevent capturing the screen/print screen option , ...