Showing pdf contents in browser not using adobe acrobat etc

[mapleleaf]

I need to set up a method for a user to be able to upload a pdf that should then be readable in the browser but I want to make it work a bit like Google Patents. Basically the rest of the users shouldn't be able to grab the content. It should be read only so as not to be passed around for free.

It looks like Google is scanning each page and then running it through a reader to get the text. It then also seems to find the position of all the text so it can search the image for particular words and highlight them(cool js).

 

Any way has anyone seen a php/ js version of this concept that I can get some hints from?

Actually any language is ok if it works well.

 

Tx