When I first download a secure epub from Waterstones I open it with Digital Editions first. Then I import it to Calibre in the same way as any other file. Although it sounds a little bit complicated it was really easy.
I haven't used Books on Board so I don't know if it works in the same way - I'm not sure if Secure Adobe format is pdf or epub, so I don't know if you need to open it with Digital Editions first, sorry. I'm sure someone who has used BoB or another site will be able to give you more information.
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