Graal uses the OTN licence.<p>It states:<p><i>License Rights
We grant You a revocable, nonexclusive, nontransferable, royalty-free and limited right to (a) use one (1) copy of the binary portions of the Programs and any Supplemental Programs for the sole purpose of internal non-production and non-commercial evaluation and testing of the Programs, including, developing no more than a single prototype of each of Your applications; and (b) if provided by Us at our sole discretion, view the source code portions of the Programs internally for the purposes of evaluation and testing only (collectively, “Authorized Use”).</i><p><i>All rights not expressly granted above are hereby reserved. If You want to use the Oracle Technology for any purpose other than as permitted under this agreement, including but not limited to distribution of the Oracle Technology or the application You develop or any use of the Oracle Technology or the application You develop for Your internal business purposes (other than the Authorized Use), You must obtain a valid Oracle license permitting such use.</i><p><a href="http:&#x2F;&#x2F;www.oracle.com&#x2F;technetwork&#x2F;licenses&#x2F;early-adopter-license-2299792.html" rel="nofollow">http:&#x2F;&#x2F;www.oracle.com&#x2F;technetwork&#x2F;licenses&#x2F;early-adopter-lic...</a>