Is releasing an iOS application ipa without UDID (jailbreaked iPhones only) (of an app not yet in the app store) a good idea? [closed]

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In other words: can someone use that ipa file to upload it to the appstore? And what about an android apk file?

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With an android apk someone could sign it themselves and then release it to the market (the android version of the app store). This is actually how a lot of android malware is published.