Abstract: System and method for the real time editing of PDF documents in web browsers. Using the web browser the user can access a remote server providing PDF services, whereby user can view and/or create PDF documents. If user decides to make edits to the PDF representation shown on their display, only edits and their associated information (such as position within text, background color, font name, font color, etc.) are communicated to server. In response to receiving edits, the server generates an edit block (aka image or sub-image) and sends this back for display atop the PDF representation and within the browser so that user can visualize the modifications that they made. The edit block is intended to overlap areas of the text where user made the modifications. The server embeds changes into the PDF documents and returns the modified PDF document to user when user decides to save the changes.

Abstract: A modular PDF application which allows users to customize their own PDF versions by choosing the features that they need and/or can pay for, thus, reducing the price of such PDF license and an overall footprint of such PDF version on the computer. The PDF application comprises a main application which includes the reader and a variety of optional features that the user may chose from and add to the main application before during or after installing the main application. The main application comprises business logic for running the viewer module and for receiving and running the optional features. The business logic includes inter-dependability rules and functions between the different features to ensure an optimum operability of the installed features in the presence or absence of the other features that they depend on.