The R logo is © 2016 The R Foundation.
You can distribute the logo under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license (CC-BY-SA 4.0) or (at your option) the GNU General Public License version 2 (GPL‑2).
It is available in raster and vector formats:
The CC-BY-SA 4.0 license allows you to share and adapt the logo for any purpose, including commercial use, provided that you give appropriate credit, provide a link to the license, and indicate if any changes were made. It is also one-way compatible with the GNU General Public License version 3 (GPL‑3). However, CC-BY-SA 4.0 is not compatible with GPL‑2. If you wish to incorporate the logo into works licensed under GPL-2 then you must use the GPL-2 license for the logo.
Note that special considerations apply when using the GPL-2 license for the logo or when incorporating it into works licensed under GPL-3 . In particular, the GPL includes the concept of source, which is defined as “the preferred form of the work for making modifications to it”. We consider the vector version of the R logo in SVG format to be the source by this definition.