Copy function in Adobe Digital Editions 2

Can you please help with the copy function - I understand its restrictred to 5% but I can't find the 'details' tab that would allow me to see how much I've used and the copy function simply ceased working (and I don't believe I am any where near 5% as I've copied around a half page of an entire book). your help much appreciated.

I actually own a hard copy and I have prescribed the text for a course I'm running and I simply want to avoid a lot of typing up of answers to questions. thanks.