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That is a good question and I have wondered the same thing myself. I agree with rdfry that there is nothing remaining in the epub that identifies the purchaser.
One thing you could do to feel more comfortable is to examine the epub after DRM removal using Sigil (actually, Calibre itself has a tool which also allows you to look at the individual components of the epub/zip file. I can never remember how to find it, however). Or you could just rename the file to filename.zip and open it in a zip utility. Then go through the individual files and do searches on your name or whatever. I think you'll find that there is nothing to worry about.
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