A "licensed program" means any program or other work distributed under this License. The "Program" refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either modified or unmodified. Throughout this License, the term "modification" includes, without limitation, translation and extension. A "covered work" means either the Program or any work based on the Program. Each licensee is addressed as "you".
To "propagate" a work means doing anything with it that requires permission under applicable copyright law, other than executing it on a computer or making private modifications. This includes copying, distribution (with or without modification), sublicensing, and in some countries other activities as well.