diff -r ffa851df0825 -r 2fb8b9db1c86 symbian-qemu-0.9.1-12/dtc-trunk/README.license --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/symbian-qemu-0.9.1-12/dtc-trunk/README.license Fri Jul 31 15:01:17 2009 +0100 @@ -0,0 +1,56 @@ +Licensing and contribution policy of dtc and libfdt +=================================================== + +This dtc package contains two pieces of software: dtc itself, and +libfdt which comprises the files in the libfdt/ subdirectory. These +two pieces of software, although closely related, are quite distinct. +dtc does not incoporate or rely on libfdt for its operation, nor vice +versa. It is important that these two pieces of software have +different license conditions. + +As the copyright banners in each source file attest, dtc is licensed +under the GNU GPL. The full text of the GPL can be found in the file +entitled 'GPL' which should be included in this package. dtc code, +therefore, may not be incorporated into works which do not have a GPL +compatible license. + +libfdt, however, is GPL/BSD dual-licensed. That is, it may be used +either under the terms of the GPL, or under the terms of the 2-clause +BSD license (aka the ISC license). The full terms of that license are +given in the copyright banners of each of the libfdt source files. +This is, in practice, equivalent to being BSD licensed, since the +terms of the BSD license are strictly more permissive than the GPL. + +I made the decision to license libfdt in this way because I want to +encourage widespread and correct usage of flattened device trees, +including by proprietary or otherwise GPL-incompatible firmware or +tools. Allowing libfdt to be used under the terms of the BSD license +makes that it easier for vendors or authors of such software to do so. + +This does mean that libfdt code could be "stolen" - say, included in a +proprietary fimware and extended without contributing those extensions +back to the libfdt mainline. While I hope that doesn't happen, I +believe the goal of allowing libfdt to be widely used is more +important than avoiding that. libfdt is quite small, and hardly +rocket science; so the incentive for such impolite behaviour is small, +and the inconvenience caused therby is not dire. + +Licenses such as the LGPL which would allow code to be used in non-GPL +software, but also require contributions to be returned were +considered. However, libfdt is designed to be used in firmwares and +other environments with unusual technical constraints. It's difficult +to anticipate all possible changes which might be needed to meld +libfdt into such environments and so difficult to suitably word a +license that puts the boundary between what is and isn't permitted in +the intended place. Again, I judged encouraging widespread use of +libfdt by keeping the license terms simple and familiar to be the more +important goal. + +**IMPORTANT** It's intended that all of libfdt as released remain +permissively licensed this way. Therefore only contributions which +are released under these terms can be merged into the libfdt mainline. + + +David Gibson +(principal original author of dtc and libfdt) +2 November 2007