protection period (of copyright)
Legal term referring to the duration of copyright protection. Often used in contexts discussing intellectual property law.
The copyright protection period is 70 years after the author's death.
著作権 is the copyright itself, while 保護期間 specifies the duration of that protection.
Compound of 保護 (protection) and 期間 (period). A straightforward legal term with no obscure historical derivation.