June 23, 2009. Amazon Technologies received a US patent for obtaining customer reviews of purchased items. US 7,552,068. What's the secret for getting customer reviews? Very simple: ask!
And, while you are asking for feedback, don't forget to recommend something else that the customer might like to buy.
A critical hole in the claim, though. If the content is streamed, you might know in real time when the user completes or stops watching the video, so there is no need for estimation of the evaluation time. Based on that, a simple workaround can be constructed to avoid infringing this patent.
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