Free Licenses

While there are patents that cover OCB, I have decided to freely license my IP for “most” software. Note that the summaries below are non-binding summary of legal documents (clice on each link for the legal document). The parameters of the license are specified in the license document and that document is controlling.

An interesting provision of licenses 1 and 2 is that the license grant to a party terminates if that party sues someone else over their use of OCB. This is a legal scholar’s clever approach for me to try to discourage others from suing you for using OCB.

If you have a use for OCB in mind that is not covered by the above grants but for which you believe that a paid-up license would be inappropriate, please write to me to explain. Otherwise, I will license OCB under fair, reasonable, and non-discriminatory terms. Here is an old patent-assurance letter I wrote for the IEEE promising this. I expect licensees to pay a small, one-time fee. I intend that no solvent company should find licensing to be a significant burden. To inquire about a license other than those above, just send an email to

Acknowledgments. Many thanks to the students and faculty at Harvard’s Berkman Center for Internet & Society. Without their expertise, I would have been clueless about how to do what I wanted to do. Thanks also to Dan Bernstein for a helpful suggestion about expanding the scope of the License 1.

Back to the OCB homepage