There was a release in 1993, a complete open source release of all code developed during the 80s at autodesk in 1999, a release around 2003, a windows demo in 2

There was a release in 1993, a complete open source release of all code developed during the 80s at autodesk in 1999, a release around 2003, a windows demo in 2007, and this latest release. There were some intellectual-property-related delays, mostly related to either unfiled patents (wherein the ideas were under trade secret protection until the patent applications were filed) or due to the difficulty of convincing all developers involved to agree to a release. Having too many developers and not getting them to agree to a license or design beforehand bit him in the ass several times.