Originally Posted by Jellby
Author names have a "file-as" attribute that should be set to "Last-name, First-name".
Regarding DRM'd files, I believe those have each file in the zip encrypted separately, that means you can probably extract the (encrypted) files as with any other epub. With some luck, only the book contents will be encrypted and not the OPF file (metadata). If this is the case, you can edit the metadata and re-zip the file.
Unless the names are Asian or Hungarian... in which case their natural form is "Last-name First-name" and the comma is arguably unnecessary (if not downright inappropriate... by virtue of suggesting the normal name order to be Western name order).