 yaffs is open source  yaffs is open source admin 28 february 2012 1023pm faheart yaffs is downloadable with a gnu general public licence v2 as at http wwwgnuorg licenses gpl20html you get the source code with all the benefits that brings and of course if you buy a commercial licence you get the source code too but without the encumberance of your responsibilities under the gnu gpl because it s open source you can always see what the code is doing and trace through and having the code means you ll never be in a situation where you are critically dependent on us either from a technical or a business perspective  