Material licensed under the current version of the license can be used for any purpose, as long as the use meets certain conditions.
All previous authors of the work must be attributed.
All changes to the work must be logged.
All derivative works must be licensed under the same license.
The full text of the license, unmodified invariant sections as defined by the author if any, and any other added warranty disclaimers (such as a general disclaimer alerting readers that the document may not be accurate for example) and copyright notices from previous versions must be maintained.
Technical measures such as DRM may not be used to control or obstruct distribution or editing of the document.
