Provided Calibre is on the same machine as your working Adobe Digital Editions, you should not need to customise the plugin.
The easiest way to tell if DRM has been removed is to try to view the ebook in Calibre. Just highlight the book in Calibre and press view. Calibre will not open the book for reading if it still has DRM. If you can read the book then the copy actually in Calibre is without DRM. This means either Calibre removed the DRM on input or that the file you imported did not actually have DRM. To make sure it is the former and not the latter you need to confirm that the original file you imported had DRM. If it did, Calibre Viewer will not open it. In the Calibre viewer, one of the icons on the side lets you open an ebook file from the file system. Click on this and open either your original epub or the copy in your temp folder. Calibre should not be able to open it and give you a message about DRM.
If you can read the original file in Calibre, you should then continue to open original books in the viewer until you do get one that can't be read because of DRM. You then import this book to Calibre, highlight it and press view. If you can then read it the DRM has been removed from the copy in Calibre.
The convert function is not necessary for what you want to do. This function converts between different EBook formats. For example, you could convert your epub to a mobi or azw3 to read on a Kindle.
I suspect that you have it working perfectly, but the above procedure will let you verify this.
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