They are a great TTS engine, and please support their efforts in making quality text to speech software. They have been extremely helpful, and bar none the best company I have had the pleasure to deal with in context to text to speech software.
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to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.