Copyright and license

• GNU stamp — based on the official GNU Head logo originally created by Etienne Suvasa and re-drawn by Peter Gerwinski; available under the same terms.
• Alternative GNU stamp — available under the same license as the Alternative GNU Head.
• Free as in “freedom” — based on the official GNU Head logo; available under the GNU Free Documentation License.
• GNU Emacs stamp — based on the GNU Emacs logo, created by Luis Fernandes and vectorised by Dmitry Dzhus. The vector version of the logo is available under the GNU General Public License, either version 2 or any later version.
• GPLv3 stamp — based on the original GNU GPLv3 button and available under the same terms.
• GNU Hurd stamp — based on the original Hurd Metafont Logo designed by Stephen McCamant, and available under the same license.
• GNU Post — created from scratch by Tomasz W. Kozłowski; the image is in the public domain.
• FSF Airmail — based on the official Free Software Foundation logo created by Li Jiang, and available under the GNU General Public License, either version 2 or any later version.
• GNU postcard — based on Victor Siame's vector version of “The Dynamic Duo: The Gnu and the Penguin in flight,” and available under the same license.
• GNU postcard (back) — created by Tomasz; the elements are trivial and it falls in the public domain, but because it embeds the GNU Emacs image under GPL, it is distributed as a whole under the GNU General Public License, either version 2 or any later version.