We have been discussing under https://issues.apache.org/jira/browse/LUCENENET-380 the possibility of bringing Sharpen into our repo under a db4o Opensource Compatibility License (dOCL) license. Here are the basics of what we have been discussing.
Versant allows db4o products to be licensed three different ways as discussed on the following website http://www.db4o.com/about/company/legalpolicies/docl.aspx. It seemed to me that it may be possible that the ASF could come to an agreement with Versant and under a db4o Opensource Compatibility License (dOCL) allow a Sharpen variant in our repository. The other option is to create a fork under the GPL license and maintain it outside of ASF. Scott