 commercial licences commercial licences admin 13 june 2017 939am aleph one as owners of yaffs sell commercial licences for the use of yaffs which do  not  carry the obligations of gpl under the gpl if you distribute your product with yaffs you are required to licence your product under the gpl and make available the full source code for a small charge 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 contributing modifications of yaffs code to the mainline code does not alter its licence statusthe 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 