A colleague approached me this morning with an interesting question that I realized I didn't know how to answer. How are open source projects in the library community dancing around technologies that may have been patented by vendors? We were particularly wondering about this in light of open source ILS projects, like Kuali OLE, Koha, and Evergreen. I know OLE is still in the early stages, but did the folks who created Koha and Evergreen ever run into any problems in this area? Have library vendors historically pursued patents for their systems and solutions?