I use Calibre plus a Kobo Aura One. I had a dreadful shock today when I realised that the Kobo was telling me that all my recent downloads couldn't be opened because they were DRM'd. I went back to the Calibre advice page, updated Calibre, then updated my DRM removal. Everything now works.
I'm not a hi-tech person, and therefore I feel a tremendous sense of achievement.
But it's Kovid that really deserves the thanks: thank you for supplying really clear instructions that even an idiot with a Ph.D can understand!
