Some devices are designed to deny users access to install or run modified versions of the software inside them, although the manufacturer can do so.
Propagation includes copying, distribution (with or without modification), making available to the public, and in some countries other activities as well.
To “convey” a work means any kind of propagation that enables other parties to make or receive copies.
If the interface presents a list of user commands or options, such as a menu, a prominent item in the list meets this criterion.
The “source code” for a work means the preferred form of the work for making modifications to it. A “Standard Interface” means an interface that either is an official standard defined by a recognized standards body, or, in the case of interfaces specified for a particular programming language, one that is widely used among developers working in that language.
We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. When we speak of free software, we are referring to freedom, not price.
Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.The systematic pattern of such abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable.Therefore, we have designed this version of the GPL to prohibit the practice for those products.For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software.For both users' and authors' sake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.