[android-developers] app distribution best practices

I am nearing the point of releasing my first Android app. I anticipate needing to distribute from a website as well as from Google Play. I know that enabling the install is as simple as providing an HTML link to the .apk file, but I'd like to at least follow best practices with regard to discouraging redistribution.

Given that goal, it would seem important to restrict the type of client that is allowed to initiate the download. Google Play does this, I think.  One step in this direction would be to check the HTTP user-agent header, but this check is circumventable. Does anyone know if Google Play does something more sophisticated, or if a more sophisticated method even exists?

Any other "best practices" suggestions, or "lessons learned" with regard to app distribution would also be most welcome. I understand there is no perfect protection, but I'm hoping to avoid doing anything foolish.

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