ReoGrid License Agreement has two versions because of a licensing model change starting with Version 4. In Version 3, ReoGrid was distributed under a free license with certain conditions.
Starting from Version 4, ReoGrid has shifted to a proprietary software license in order to better support commercial use, provide official technical support, and ensure the sustainability of ongoing development.
As a result, License Agreement Ver.4 applies to the new commercial editions, while License Agreement Ver.3 remains available for users of the previous version.