You can use emWin with any open source license that does not require the source code of emWin to also be released and licensed under the same open source license terms. For example, the modified GPL license for FreeRTOS explicitly adds an exception that any linked libraries are excluded from the open source license terms. Unmodified GPL licenses do not have this exception, so the free emWin could not be used with an unmodified GPL license. The increasingly popular BSD-style licenses place no restrictions on any other parts of the firmware that might be linked in with the BSD-licensed code. BSD-licensed code can be used with emWin because there are no requirements to release the emWin source and place it under similar license terms. Please refer to the license agreement for specific details.
