There are many logos and trademarks in the United States that are not protected by copyright because they are below the threshold of originality required for copyright protection. There are some cases that even logos and trademarks that have been judged to be copyrighted in foreign countries have also been judged not to be copyrighted in the United States. However, some logos and trademarks are copyrighted in the United States. See COM:CRT/United States#Threshold of originality for more information.
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.