[jj2me]

EDIT: ACK! Moderator, please delete this post. This post was originally about Calibre's "Remove books" button removing from the PC, not just the Library, and I thought I lost my original purchased book. But I found the original downloaded files in another folder.

So the procedure for those who use Calibre to convert, but Sony's eBook Library to load, is to make a copy of Calibre's output .lrf file in some other location before invoking Calibre's "Remove books", and load the new .lrf copy into eBook Library.