+[GPLv2§]2. You may modify your copy or copies of the Program or any
+portion of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1 above,
+provided that you also meet all of these conditions:
+
+
+a) You must cause the modified files to carry prominent notices stating
+that you changed the files and the date of any change.
+
+
+b) You must cause any work that you distribute or publish, that in
+whole or in part contains or is derived from the Program or any
+part thereof, to be licensed as a whole at no charge to all third
+parties under the terms of this License.
+
+
+
+# GPLv3§5(a-c)
+
+
+
+You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+
+a) The work must carry prominent notices stating that you modified it, and
+giving a relevant date.
+
+
+b) The work must carry prominent notices stating that it is released under
+this License and any conditions added under section 7. This requirement
+modifies the requirement in section 4 to "keep intact all notices".
+
+
+c) You must license the entire work, as a whole, under this License to anyone
+who comes into possession of a copy. This License will therefore apply,
+along with any applicable section 7 additional terms, to the whole of the
+work, and all its parts, regardless of how they are packaged. This License
+gives no permission to license the work in any other way, but it does not
+invalidate such permission if you have separately received it.
+
+
+
+# GPLv2§2¶ ante-penultimate & penultimate
+
+
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+
+
+
+# GPLv3 §0 ¶1-5
+
+
+ "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+
+ "The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+
+To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy. The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+
+ A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+
+# Binaries (i.e., Object Code) are Modifications
+
++ Software that the computer understands is different than software humans
+ read.
+
++ There is often a process required to modify (and/or translate) the software
+ from human-readable
+ + This process can be done ahead of time.
+
++ Separation of source and binary was the first way proprietary software
+ companies discovered to subjugate users.
+ + GPL uses the fact that binaries are modifications (which are often
+ distribution) to prevent that subjugation.
+
+# GPLv2 § 3(a-b)
+
+
+
+
[GPLv2§]3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+
+a) Accompany it with the complete corresponding machine-readable
+source code, which must be distributed under the terms of Sections
+1 and 2 above on a medium customarily used for software interchange; or,
+
+
+b) Accompany it with a written offer, valid for at least three
+years, to give any third party, for a charge no more than your
+cost of physically performing source distribution, a complete
+machine-readable copy of the corresponding source code, to be
+distributed under the terms of Sections 1 and 2 above on a medium
+customarily used for software interchange;
+
+
+
+# GPLv3 § 6(a-b)
+
+
+
+[GPLv3 § ] 6. Conveying Non-Source Forms.
+
+
+You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+
+a) Convey the object code in, or embodied in, a physical product
+(including a physical distribution medium), accompanied by the
+Corresponding Source fixed on a durable physical medium
+customarily used for software interchange.
+
+
+b) Convey the object code in, or embodied in, a physical product
+(including a physical distribution medium), accompanied by a
+written offer, valid for at least three years and valid for as
+long as you offer spare parts or customer support for that product
+model, to give anyone who possesses the object code either (1) a
+copy of the Corresponding Source for all the software in the
+product that is covered by this License, on a durable physical
+medium customarily used for software interchange, for a price no
+more than your reasonable cost of physically performing this
+conveying of source, or (2) access to copy the
+Corresponding Source from a network server at no charge.
+
+
+
+# GPLv3 § 1 ¶ 1, 4-6
+
+
+
+The "source code" for a work means the preferred form of the work
+for making modifications to it. "Object code" means any non-source
+form of a work.
+
+
+The "Corresponding Source" for a work in object code form means all the
+source code needed to generate, install, and (for an executable work) run the
+object code and to modify the work, including scripts to control those
+activities. However, it does not include the work's System Libraries, or
+general-purpose tools or generally available free programs which are used
+unmodified in performing those activities but which are not part of the work.
+For example, Corresponding Source includes interface definition files
+associated with source files for the work, and the source code for shared
+libraries and dynamically linked subprograms that the work is specifically
+designed to require, such as by intimate data communication or control flow
+between those subprograms and other parts of the work.
+
+
+The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+
+The Corresponding Source for a work in source code form is that
+same work.
+
+
+
+
+# The GPL is a Complex Topic
+
++ An in-depth seminar on GPL's provisions is a one-day course …
+ + … but the written materials discuss every section in depth.
+
++ Keep in mind: every requirement has a carefully considered purpose to
+ uphold freedom of users.
+
++ Software freedom licenses have a moral perspective.
+ + This is probably the most difficult thing for lawyers to understand.