The open source versions of Rainbond ('Rainbond' for short) are licensed under the GPLv3 License.
Private individuals or Legal Entities are allowed to use Rainbond for free, as long as they do not distribute (internally or externally, free or charge) it in any ways.
Once private individuals or Legal Entities copy or modify Rainbond source code in any ways, the modified version and copies will fall under the GPLv3 License.
For any non-GPL usage of Rainbond, one or multiple Commercial Licenses authorized by Goodrain Co., Ltd. must be obtained first.