As per the report, several lines of code in the Play Movies app explicitly state that “movies belonging to you have been upgraded to 4K.” Additionally, there is said to be no link to any pricing related to this update, suggesting the fact that the upgradation might be free of charge and there is reportedly one line of code mentioning the same. It should be noted that the free upgrade to 4k or the highest available quality might only be rolled out for movies that are purchased in HD and not for the SD versions, as per the code.