Intellectual property rights is the legal right to property owned by a content creator, and often protected through the use of a trademark or copyright. This content is the creator's intellectual property.
Intellectual property is an umbrella term covering patents, trademarks and copyrights.
Intellectual property rights are specific abilities, granted by law to rights holders, for the control of...
It varies from country to country. In the US, works created by officers or employees of the federal government in the course of their duties are not protected by copyright; the government can have...
Typically there would be a written agreement between the artist and the entity to which they are surrendering their rights. See the article linked below for an example.