License of the meter_reader datasets (meter_det, meter_seg, meter_test) / 表计读数数据集的许可证 #5213

The meter reader example (examples/meter_reader in release/2.1, and
Paddle_Industry_Practice_Sample_Library/meter_reader in awesome-DeepLearning)
links three datasets hosted on bj.bcebos.com: meter_det.tar.gz,
meter_seg.tar.gz and meter_test.tar.gz. The README says the datasets are open
("本案例开放了表计检测数据集、指针和刻度分割数据集"), but neither the archives
nor the README state a license, and the Apache-2.0 license of the repository
covers the files in the repository.

1. Under which license are these three datasets released? Is it Apache-2.0,
   like the repository?
2. May they be used to train a model that is part of a commercial product,
   with attribution and without redistributing the images?

请问 meter_det、meter_seg、meter_test 这三个数据集采用什么许可证？是否允许用于训练
商业产品中的模型（注明出处，不再分发图片）？谢谢！