That is really pretty useless if you ask me. People usually will not share a download by letting others log into their account. So what are you exactly trying to stop? If people want to share it they will, this just sounds like alot of needless work. And all you really are doing is stopping your users from being able to download from multiple machines, it will not prevent them from installing on multiple machines either.
And you would need to write browser extensions that your users would have to install on their machines in order to do this, again alot of work for something that seems completely useless.
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