Buying movies, series shows online is basically the moving trend in the entertainment industry.
Many apps, live stream services have made this possible.
To maximize user engagement, Google Play Movies and TV Store will be upgrade its movies/shows (in SD or HD) to 4K, free of charge.
To enjoy this service, users must have purchased the film in one of the aforementioned lower resolutions (either HD or SD) and, more importantly, there needs to be an equivalent 4K version on the Google Play Store.
The upgrade offer is also only available to folks living in the US and Canada for now.
There is no firm announcement on when this upgrade could come to other territories.