Are the ebooks watermark-free?

I can't seem to easily find if your ebooks, which I'm happy to see are DRM-free, are also watermark-free. If it matters, more specifically me and the missus might be interested in Schneier's Liars and Outliers as epub. I'm somewhat wary about purchasing files whose leakage may result in potentially huge liability, though, as I'm pretty sure Schneier could appreciate...

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