I finally was able to receive a desk copy of one of the textbooks I assigned this semester. It's from Cengage Publishing, and downloaded with no problems. I've only had it for a short while, but so far all of the annotation tools, etc. work as with any other content [Note - I haven't downloaded the Dingo update yet, so I hope all will still be well after I do so.]. For anyone who is using a text from Cengage, or one of its imprints, the individual who I communicated with left these instructions for potentially obtaining a desk copy:

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"You can certainly let your fellow educators know that if they are interested in reviewing a text with the Entourage features on their eDGe, I’ll need the following information.

Name of Professor
Email address
School they are affiliated with
Entourage Device Serial Number
ISBN# of the text (note that ideally they should check the Entourage website first to confirm they have the text on their site)

Let me know if you have any questions."

Audrey Tortolani
Executive Director, Business Integrations
Cengage Learning
20 Channel Center Street
Boston, MA 02210

(o) 617.757.8061 | (e) audrey.tortolani@cengage.com | www.cengage.com

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Hope that's helpful.