There is a bug with some epub-files (and no there is no DRM), with trying to remove ebbeded fonts:
Quote:
Modify ePubs
Logfile for book ID 5212 (Book / Author)
5212
Modifying: /tmp/calibre_1.0.0_tmp_9XrxZj/TPyloO_modify_epub/5212.epub
Parsing xml file: OEBPS/content.opf
Parsing xml file: OEBPS/toc.ncx
Looking for embedded fonts
ERROR - cannot remove embedded fonts from DRM encrypted book
ePub not changed after 0.05 seconds
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