Copyright vs Plagiarism

Definitions

Definitions:

Copyright:

"A bundle of intangible rights granted by statute to the author or originator of certain literary or artistic productions, whereby, for a limited period, the exclusive privilege is given to that person (or toany party to whom he or she transfers ownership) to make copies of the same for publication and sale" (Source)

Copyright Infringement:

"Copyright infringement involves any violation of the exclusive rights of the copyright owner. It may be unintentional or intentional." (Source)

Fair Use:

"Fair use is a judicial doctrine that refers to a use of copyrighted material that does not infringe or violate the exclusive rights of the copyright holder. Fair use is an important and well established limitation on the exclusive right of copyright owners. (Source)

Plagiarism:

According to the Merriam-Webster Online Dictionary, to "plagiarize" means:

to steal and pass off (the ideas or words of another) as one's own
to use (another's production) without crediting the source
to commit literary theft
to present as new and original an idea or product derived from an existing source

In other words, plagiarism is an act of fraud. It involves both stealing someone else's work and lying about it afterward. (Source)