There are many groups exploring variations of the strict OSS model. They include individuals who are supportive of the OSS model, but who need some kind of financial reward for their work, and organizations who want to reap the benefits of the OSS model, but are concerned that OSS is a little too open for their lawyers and stockholders. Some organizations attempt to create alternative licenses[15,16,17] but these have almost universally met with severe criticism and mistrust[18,19,20,13,21]. Besides the plethora of free for non-profit licenses, some projects have explored a different approach: dual licensing. By coupling a copyleft license together with a commercial license, these projects enable anyone to purchase the right to distribute non-OSS derivative works, while still maintaining the rights of redistribution, derived works, and no discrimination for OSS use. The Berkeley DB[22] project uses this approach. As more companies take an active interest in the OSS development model, there will be continued discussion over how to achieve the best of both worlds.