Trying to Transfer Book to Second Authorized Computer

[Sandmaggie]

I downloaded a school textbook to my main computer, but want to put it on my traveling netbook.  When I copied the book file from My Digital Editions on the main computer to the netbook and then try to open on the netbook, I get the error "Document is not licensed for this device type"

Help please!  I haven't found a reference to this error.

[Guest]

The book in question is most likely restricted to a single computer.  You can confirm this by bring up the info dialog for the book and looking at the permissions.