>The case of a leaker getting her hands on 2 copies is however highly unlikely.
I'm not so sure about that. Some groups used to have a general practice of always getting at least two distinct copies from a supplier to avoid burning sources. And I doubt they just averaged either, but detected discrepancies and manually eliminated potential areas of interest. A few releases of cracked software were even actually compiled afresh from source, or were object code before a wrapper protection was added. Some suppliers were developers themselves, who weren't always seeing eye-to-eye with their publishers.
Of course, perhaps the 'race' to be first has all but eliminated this from modern practice. I couldn't say.
I'm not so sure about that. Some groups used to have a general practice of always getting at least two distinct copies from a supplier to avoid burning sources. And I doubt they just averaged either, but detected discrepancies and manually eliminated potential areas of interest. A few releases of cracked software were even actually compiled afresh from source, or were object code before a wrapper protection was added. Some suppliers were developers themselves, who weren't always seeing eye-to-eye with their publishers.
Of course, perhaps the 'race' to be first has all but eliminated this from modern practice. I couldn't say.