Apple has warned developers of the imminent removal of thousands of mobile games and apps from the Chinese App Store -- the second wave of removals this year. The Wall Street Journal obtained an official Apple memo that was sent earlier this month, warning developers that they needed to submit proof of a Chinese government license on or before December 31, 2020. This is the reemergence of an issue from July, when at least 15,000 games were removed from the Mainland Chinese App Store in a single month. To avoid removal, developers and publishers needed an ISBN (International Standard Book Number) from China's National Press and Publication Administration -- a relatively slow process, which all but guarantees the failure of many companies to comply. In a statement issued to the Wall Street Journal, Apple acknowledged that it receives requests for the removal of apps in various regions.