Copyright

The right to use or make copies of a book or musical or artistic composition.

A copyright is an intangible asset that lasts for the life of the creator + 50 years. In the hands of the creator, the value of the copyright is the cost for the legal fees to obtain the copyright. If a copyright is purchased, the value is the amount paid. The purchase price can be amortized over the useful life.

https://accounting.uworld.com/cpa-review/lc/accounting-dictionary/term/copyright/