How to remove a DRM from a purchased book

How to remove a DRM from a purchased book

 

I recently purchased a book fromGoogle Play, using calibre . It came with a blue question mark, but I did not worry as the purchase was acceted.
The point is, I can always call it up on calibre, but I can not
copy it in my E-book. As I did not buy it for myself this is a problem.
They will not refund the money either.They tell me to complain to
calibre.. If I copy my calibre to a notebook of the person who is
the receiver of the book, would it work.?

Any suggestions would be welcome.

Klaus