Originally Posted by DiapDealer
For the files downloaded to actual eink devices, yes they're "movable." But not so for files downloaded to K4PC/Mac.
It's an easy mistake to make.
(but important enough for people to take note of, I think)
And if your K4PC deregisters itself, the previous downloaded DRM books will not open. They all have to be redownloaded.
I found this out after K4PC 1.7.0 came out last year. 700 books I had to redownload due to a temp file cleaner program I had used for years wasn't compatible with the new version of K4PC. Now my Archive is close 3000 so I backup everything to Calibre!