Who Owns My Data?

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We, as physicians, have had our data taken from us, used against us, and used to sell to us for years.  I have had drug reps show me my prescription habits in certain medication classes!   This was info bought by the pharmaceutical company from a pharmacy.  I know that the future of “Big Data” means every one and their uncle is taking information about me and my care of patients and playing with it.  They are then selling it or using it to screw me (insurance companies) or for a myriad of other reasons I probably don’t know about.  The question is, who owns my data?  I don’t remember signing off on anything.   I don’t remember allowing the EMR system to give my stuff away.  Does anyone out there know the answer to this question?  Because if we, as doctors, still own it then why are we giving it away?