...available as described in Section 4(b), you shall promptly modify the LEGAL file in all copies you make available thereafter and shall take other steps (such as notifying appropriate mailing lists or newsgroups) reasonably calculated to inform those who received the Licensed Product from you that new knowledge has been obtained. ii. Contributor APIs. If your Modifications include an application programming interface ("API") and you have knowledge of patent licenses that are reasonably necessary...
--BitTorrent Open Source License, Version 1.0. (Paragraph 37.)