What is the difference between plagiarism and collusion?

Plagiarism is the deliberate use of a copyrighted work passed off as your own work - so a book or a song that is copied from another author or artist and published under your own name without credit to the original copyright owner is 'plagiarised'.

Collusion is when two or more people cooperate to perform a crime or other misdeed, so if the publisher of a book helps you to plagiarise itthen they are colluding in the crime. A collusion can also be referred to as a conspiracy but (under the law) a conspiracy ends when the act is committed whereas a collusion implies an on-going

agreement - usually to keep the act secret.