Can't copy text excerpts

Hi,

I have been reading a Java Programming book on Adobe Digital Editions, and until now I have been able to copy excerpts from the book. Particularly code so that I can run the examples in Eclipse. However just now it won't let me copy any more. The right click menu is grayed out and using Ctrl+C doesn't work either. I tried going back to the previous pages to see if maybe I was only allowed to copy from Chapter 1 or something but now I cannot copy text I was previously able to.

I have tried restarting the program and my machine but still the problem persists.

Is it something to do with this (see below)? Am I only allowed to copy text 15 times?