The Cop Block website states (at the bottom of every page) that all of its content are licensed under the Creative Commons Attribution-ShareAlike 3.0 License unless otherwise stated. There is no mention of the logo being an exception.
Licensing
Please note: This image was originally uploaded to Wikimedia Commons licensed as noted. The copyright holder has since changed the licensing to be more restrictive. Creative Commons licenses are non-revocable. See the Creative Commons FAQ on revoking licensing.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.