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A public domain license essentially means that a work is not protected by copyright or other intellectual property laws, allowing anyone to use, modify, and distribute it freely. This status can arise naturally when copyright expires or through an explicit dedication to the public domain. There are also licenses, like CC0, that aim to achieve a similar effect, particularly in jurisdictions where formally dedicating a work to the public domain is not possible.

Here's a more detailed explanation:

What is the Public Domain?
- The public domain consists of creative works that are not protected by copyright or other intellectual property rights.

- This can happen when copyright on a work expires, or when the creator explicitly waives their rights to the work.

- No permission or license is needed to use a work in the public domain.

Public Domain Equivalent Licenses
- Some jurisdictions don't allow creators to formally dedicate their work to the public domain, so public domain-equivalent licenses are used.
- These licenses grant the public the same broad rights as a work in the public domain.
- Creative Commons CC0 is a popular example, waiving all copyright and related rights.

Key Characteristics of Public Domain Works:
- Free to Use: No permission or fee is needed to use public domain works.
- Can be Modified: You can change or adapt a public domain work.
- Can be Distributed: Public domain works can be shared freely.
- Can be Commercialized: You can use public domain works for commercial purposes.

Examples of Public Domain Works:
- Works with expired copyrights, like some older writings and musical scores.
- Works explicitly dedicated to the public domain through licenses like CC0.

In essence, a public domain license or the status of a work in the public domain means it is freely available for anyone to use without restriction, promoting open access and reuse of creative and intellectual works.

A Creative Commons (CC) license allows creators to share their work with specific permissions, enabling others to copy, distribute, and build upon it, while still retaining copyright. Essentially, it provides a standardized way for creators to grant permissions for reuse and adaptation of their work under copyright law.

Here's a more detailed explanation:

Copyright Retention:
Unlike relinquishing copyright, a CC license allows the creator to maintain ownership of their work while simultaneously granting specific permissions for its use.

Flexible Permissions:
Creators can choose from a range of CC licenses, each offering different levels of permission. These licenses can dictate whether the work can be used commercially, if derivative works are allowed, and if attribution is required.

Standardized Licensing:
Creative Commons provides a set of standardized licenses that are legally sound and widely recognized, simplifying the process of sharing and reusing works.

Attribution:
Most CC licenses require attribution, meaning that users must credit the original creator when using the work.

Examples:
Platforms like YouTube allow creators to apply a Creative Commons Attribution license to their videos, enabling others to reuse the content with attribution.

Types of Licenses:
There are several different CC licenses, each with its own set of conditions. Some common conditions include:

- Attribution (BY): Requires users to give credit to the original creator.
- ShareAlike (SA): Requires derivative works to be shared under the same license.
- NonCommercial (NC): Restricts the use of the work to non-commercial purposes.
- NoDerivatives (ND): Prohibits the creation of derivative works.

An extended license is an additional agreement to the standard royalty-free (RF) license that allows you to use stock photos in ways that would normally be prohibited by the standard license.

Are intended for use in news articles, blogs, and other non-commercial, informational content.
Cannot be used for commercial purposes or advertising.
Often feature recognizable people or brands.
May show a brand, a trademarked logo or product, a public personality, or recognizable people without a signed release or with limited releases.
Require a licensing agreement and may only be licensed for a set use of time.

Pay once, use many times without additional fees.

Rights-Managed (RM): Specific, limited use of copyrighted material.