1 & 3 are done for you by windows.
it content indexes my docs by default so a word search of that finds words in books in calibre library which is within my docs, by default. ( that's in Win 7 - Xp may be less smart )
windows file attributes lets you control who has write / delete access to what files..
i expect other OS have similar facilities, seems pointless to want to dup. them within calibre itself.
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