As an alternative to my "use Calibre" advice above, note that mobi2mobi (from MobiPerl) can remove the clipping limit (EXTH record type 401) entirely (like Calibre) or change its value. It can do this even if your AZW file has DRM. It does not remove the rest of the DRM, but it does remove/edit the limit. I don't know what effect this has if you have existing clippings and highlights, because the .mbp file might get automatically deleted if the AZW file is replaced.
|