This is not open source, because this is in the license:

> Additional Information:

> If there is any conflict, the rules in this section are more important than the usual rules of the Apache License.

> - Without a special written agreement, you can't modify the paid features of SwiftWave.

> - Without a special written agreement, you can't share or sell another paid version of SwiftWave.

> - Also, if you change the free features of SwiftWave and want to redistribute, you have to share those changes for free and need to keep the changes open source.