Distinguish between previews and licenced os

Jun 18, 2015
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Iam using L730 and using windows insider I had installed gdr 2 update but the battery was draining quickly so I went to Nokia care and asked them to switch back to the latest os available on L730.They said that gd2 is now available on it and gave me the device after the re installation.But I have a serious doubt about this.Is gd2 for L730 has been officially released? And how to distinguish between previews and licenced os?
 

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