Under which licenses does Letters come? Ludwika Slowikowska March 15, 2018 10:19 Updated Follow Letters is distributed under commercial license. For details on the Letters commercial license please contact us. Related articles Where can I find the Letters pricing? How does one integrate Letters into their application? What is Letters? What is the technology behind Letters? Under which licenses do CKEditor 5 Collaboration Features come? Comments 0 comments Please sign in to leave a comment.