By Definition:
Copyright- the exclusive legal right, given to an originator or an assignee to print, publish, perform, film, or record literary, artistic, or musical material, and to authorize others to do the same.
Intellectual Property- a work or invention that is the result of creativity, such as a manuscript or a design, to which one has rights and for which one may apply for a patent, copyright, trademark, etc.
Public Domain- the state of belonging or being available to the public as a whole, and therefore not subject to copyright.
Many times these ideas overlap. If something is “common knowledge” say for instance that Dorthy from the Wizard of Oz wears a gingham dress then can gingham on any Dorothy character be intellectual property or copyrighted? If someone wants to play Dorothy in a video or make a movie about er do they have to get permission to wear gingham.
In Beyonce’s Countdown video she uses a lot of cultural movie and dance references. Though it did appear to many that she copied an entire dance routine the question is was she allowed to do that? Can someone patent or put a copyright on a dance move? Many people struggle with the idea that an “idea” could be copyrighted. Have all ideas or concepts or inventions be thought of or made before in some sort of fashion?
Personally I believe that Beyonce’s video is public domain. Do I think she should have given credit to the choreographer; sure I do. But all in all cultural references are something that many people can spot so they become common knowledge.