Welcome to MobileRead Pat.
Your question as you can imagine is quite common. The solution involves in removing the DRM from the book and then converting it to Mobi format. There are some legal/moral complications to this which are discussed extensively here if you wish to search and read.
The rules of this board prevent giving direct help in the removing of DRM ... although if you are able to download and read the book in Adobe Digital Edition and you have a working Calibre library, you are almost there.
To continue, Google the phrase "Apprentice Alf Blog" and read the entry on DRM and the Perplexed. Follow his directions.
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