Quote:
Originally Posted by RobertDDL
If that is the case with the one I bought I regret to have supported a ripoff artist, but I bought it 2 years ago and hadn't been aware of a free alternative, and $30 had seemed a reasonable enough price. There are two files alfcrypto.dll and alfcrypto64.dll in the program directory, so it seems the program may indeed be Alf-based. It's a standalone tool, though (which I prefer), not a Calibre plugin, so maybe they built their own application around the decryption routine? Still, they should at least have credited the source, if they used it 
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Alf's tools can be used standalone, as well as in the form of Calibre plugins. Look on Alf's site for details. There's also the point that you're probably missing the regular updates to the tools that appear on Alf's site by using your "alternative" version; there have been a fair number of updates to them in the course of the last two years.