License Zero Reciprocal Public License (L0-R)

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Uses with any modification that is not "Open Source" as defined by the Open Source Initiative must be limited to <Grace Period> calendar days. 4. Uses as part of, or in development of, other software that is not "Open Source" as defined by the Open Source Initiative must be limited to <Grace Period> calendar days. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Notes: - I've removed all mention of agent for sale of alternative licenses, as well as the automatic waiver of the copyleft conditions. My motivation was twofold. For one, those features produced considerable comment, concern, and confusion, aside from the main issue of use conditions triggering copyleft. For two, the aim of each can be achieved otherwise, outside the license text. As a result, the proposal is now _exactly_ BSD-2-Clause, plus new conditions 3 and 4. - The copyleft triggers now speak directly in terms of OSD conformance, to catch both source availability and license terms requirements. (The assumption is that L0-R, in some form, will eventually be recognized itself, so L0-R code can clearly incorporate L0-R code.) But that aside, I think the new language goes more directly to intent, and reads more clearly. - I've split the new conditions across two numbered items. This should help clarify that unmodified use alone does not trigger share-alike. - I was tempted to define terms for repeated words and phrases, but held the urge back. BSD-2-Clause doesn't do so, and for this kind of license, stylistically, I think that's probably best. -- Kyle Mitchell, attorney // Oakland // (510) 712 - 0933