Thanks for forwarding.
Jayanta Nath, 30/08/2015 00:50:
Any how can it be implemented in Proofread extension?
With manual copy and paste only, as far as I can see. I don't think
Google Drive has any API to extract text from uploaded files, though
someone should check
https://developers.google.com/google-apps/realtime/drive better than I
just did.
Note that Google terms of use are very restrictive.
Nemo