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In copyright, abandonment is the explicit release of material by a copyright holder into the public domain. In trademark is occurs when a trademark is not used for three or more years, or when it is deliberately discontinued. This is a lack of a bona fide commercial use of a trademark for a certain length of time so that the exclusive rights of use of the trademark are relinquished and another may adopt the mark or use such abandonment as a defense to a claim or infringement, unfair competition, or dilution by a trademark owner. In patent it is a relinquishment by an inventor of the right to secure a patent, in such a way as to constitute a dedication of the invention to public use.

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