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					Originally Posted by  jhowell
					 
				 
				What bothers me is the lack of attribution. Making use of other's work and pretending that it is their own. 
			
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 That would be my main beef as well. From a licensing standpoint, the tools don't really specify GPL, MIT, or BSD (not mention that it's pretty hard for anonymous user names to claim any sort of enforceable copyright), so it's unclear whether attribution is even required. 
The bottom line is that it's pretty hard for me to get up in arms about open-source software being exploited for profit when there's no formal entity releasing it under a clear license arrangement. If you want to control it; claim it (as a legal entity) under clear licensing terms.
I wouldn't do such a thing myself (without thanks & attribution), but that's just from a personal principles standpoint.
Epubor's use of Calibre code without attribution and/or making source code available (not to mention for commercial profit) would be a clear violation of Calibre's GPLv3 licensing, but Apprentice Alf and NoDRm are not entities that can claim copyright protection to my knowledge.