Australian Government Open Source Guide
Market Watch
June 22, 2005
Here is a link to the Australian government open source guide. It is a pretty good overview of different issues related to using open source products, including indemnity/warranty and issues to be aware of when using various open source licenses including the GPL.
Included is a description of the dual-licence approach for open source software vendors:
A number of open source software vendors release products under both an open source licence and a proprietary licence. This approach can work well in situations such as subcomponents or libraries. Releasing software under an appropriate open source licence increases the likelihood of broad adoption without expensive marketing. In such situations, other developers may want to build proprietary technology using the library. They generally need to opt for the version licensed on proprietary terms. Such terms generally include a royalty component, which is part of the original vendor's revenue model.
