# more than 120 year after birth plus 100 year copyright duration
**Wikidata**: [Q87353251](https://www.wikidata.org/wiki/Q87353251)  
**Source**: https://4ort.xyz/entity/more-than-120-year-after-birth-plus-100-year-copyright-duration

## Summary
“More than 120 year after birth plus 100 year copyright duration” is a heuristic used to help determine the copyright status of a creator. It uses a duration value of 120 years, qualified by the “life sign of author,” and is referenced as a method for assessing whether a creator’s works may still be under copyright.

## Key Facts
- “More than 120 year after birth plus 100 year copyright duration” is an instance of a **heuristic for determination of copyright status of a creator**.
- It is described as a **heuristic used to determine copyright status of a creator**.
- The heuristic includes a **duration** with an amount of **120** and unit **year**.
- The duration is qualified with **P2210: “life sign of author.”**
- It is listed as **related** to the class “heuristic for determination of copyright status of a creator” (described as a reference method for copyright-status determination).

## FAQs
### Q: What is “more than 120 year after birth plus 100 year copyright duration” used for?
A: It is used as a heuristic to help determine the copyright status of a creator. The heuristic provides a duration-based rule (120 years) with a qualifier tied to the author’s “life sign.”

### Q: What does the “120 years” refer to in this heuristic?
A: The structured properties specify a duration of 120 years. This duration is qualified by “life sign of author,” indicating the rule is applied in relation to an author life-related signal.

### Q: Is this an official law or a rule of thumb?
A: The source material classifies it as a heuristic for determining copyright status of a creator. That indicates it is used as a practical determination method rather than being presented here as a statute.

### Q: How is this heuristic categorized?
A: It is categorized as an instance of “heuristic for determination of copyright status of a creator.” This places it within a set of reference heuristics used for copyright-status assessment.

## Why It Matters
This heuristic matters because it provides a structured, repeatable way to reason about a creator’s likely copyright status when complete legal or biographical information may be unavailable. By expressing the rule as a duration (120 years) and attaching a qualifier (“life sign of author”), it supports consistent decision-making in workflows that need a quick, explainable assessment—such as cataloging, rights clearance triage, or metadata enrichment. Its value is in standardization: it frames copyright-status determination as a defined heuristic rather than an ad hoc judgment, which can improve transparency and comparability across systems or datasets. Because it is explicitly modeled as an instance of a broader class of copyright-status heuristics, it can also be used alongside other heuristics as part of a layered approach to rights assessment, where multiple signals are evaluated to reduce uncertainty.

## Notable For
- Being explicitly modeled as a **heuristic** (not a work, person, or legal code) for copyright-status determination.
- Using a **120-year** duration as its core quantitative parameter.
- Including a specific qualifier: **“life sign of author” (P2210)**.
- Being directly tied to the broader reference class **“heuristic for determination of copyright status of a creator.”**

## Body
### Definition and Classification
- Entity type: heuristic.
- Instance of: **heuristic for determination of copyright status of a creator**.
- Purpose: used to determine the copyright status of a creator.

### Structured Parameters
- Duration:
  - Amount: **120**
  - Unit: **year**
- Qualifier:
  - **P2210: “life sign of author”**

### Relationship to Other Knowledge
- Related to:
  - **heuristic for determination of copyright status of a creator** (a reference class of heuristics used to determine copyright status of a creator).