If the epub file you've bought does not have the correct metadata (even the DRM protected ones), you can edit the metadata yourself:
1) rename the epub file extension to *.zip
2) open this with winzip and look for the *.opf file
3) you can edit this file, which contains the meta data
(all other files are encrypted if it is a DRM protected file)
4) there are fields like <dc:creator ... opf:role"aut"> that contain the Author name
5) put the edited *.opf file back in the zip file
6) rename it back to *.epub
7) and it should open again, but with the new metadata
PS Make sure you keep a copy of the original file, before trying this out.
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