 yaffs licences yaffs licences admin 12 june 2017 130pm yaffs is available under the gnu general public licence v2 and under commercial terms for testing and experiment you can grab yaffs under the gpl free of charge right now  from our git repository   and we strongly recommend you also read how yaffs works  the git summary page shows the changes that have been made over time in the base code licenses for yaffs yaffs is the property of aleph one limited yaffs is available free of charge under the terms of the gnu general public license version 2 gnu gpl2 given at  http wwwgnuorg licenses gpl20html see especially sections 3a and 3b these and the following sections describe the obligations placed on those who distribute source and or object code embodying or associated with gpl code and therefore apply to all who use yaffs under gpl  linking yaffs to other software creates a derived work and our interpretation of linking includes dynamic and runtime linking the derived work has the usual gpl obligation to release source code to anyone who asks this remains true if you use yaffs with another or no os commercial licensing aleph one as owners of yaffs sell commercial licences for the use of yaffs which do not carry the obligations of gpl contributing modifications of yaffs code to the mainline code does not alter its licence status commercial yaffs licences are nonexclusive perpetual worldwide royaltyfree and paid for with a single fee for one product a commercial licence entitles you to most further development and improvement of the yaffs code the base price for a licence for a single product is gb 10000 sterling you can find further information about licences in these documents  yaffs under gpl yaffs licensing faq further licensing background and detail sample commercial licence if you have any questions or would like to buy a commercial licence please contact us either at 44 1223 811679 or email sales aleph1couk or see our contacts page  http wwwaleph1couk contact 