Why Licensing Matters for Game Developers
Licensing is the set of rules that determines what you can and cannot do with an asset you did not create. Every font, sprite, sound effect, and music track in your game has a license, whether you have read it or not. Ignoring licensing does not remove the legal obligations. It just means you might discover a problem at the worst possible time, like when your game is featured on a storefront and the original creator notices their work being used outside the license terms.
For indie developers using free assets, licensing anxiety is common and understandable. The terminology is confusing, the legal language is dense, and the consequences of getting it wrong feel disproportionate to the simple act of downloading a free sprite. This guide translates the most common licensing terms into plain language and walks through the practical decisions you need to make when incorporating free assets into a commercial game project.
The good news is that most free asset licenses are designed to be permissive. The creators who release assets for free generally want people to use them. The licenses exist to prevent specific abuses, like someone reselling the raw assets as their own product, not to create traps for developers building games. Understanding the few things each license prohibits lets you use assets confidently without the constant nagging worry that you are doing something wrong.
Creative Commons Licenses Decoded
Creative Commons (CC) licenses are the most common licensing framework for free game assets. They come in several variants, each adding restrictions on top of the base permission to use the work. CC0 is the most permissive: it places the work in the public domain with no restrictions whatsoever. You can use CC0 assets in any project, modify them however you want, and never credit the original creator. For game developers, CC0 is the gold standard of free asset licenses.
CC-BY (Attribution) allows all uses including commercial, but requires you to credit the original creator. The credit does not need to be prominent. A line in your game credits or a text file in your download is typically sufficient. The exact attribution requirements depend on the specific license version, but generally you need to name the creator, identify the license, and provide a link to the original work. CC-BY is very game-developer-friendly. The only burden is maintaining a credits list.
CC-BY-SA (Share-Alike) is where things get complicated. This license allows use and modification, but requires that your derivative work be released under the same CC-BY-SA license. The question of whether a game that uses CC-BY-SA assets counts as a derivative work of those assets is legally ambiguous. Some interpretations suggest your entire game would need to be CC-BY-SA, essentially making it open-source. To avoid this ambiguity, many game developers simply avoid CC-BY-SA assets entirely. CC-BY-NC (Non-Commercial) explicitly prohibits commercial use, which means any game you sell, monetize with ads, or distribute for profit cannot include these assets.
Custom and Proprietary Free Licenses
Many asset creators and platforms use custom licenses instead of Creative Commons. FreePixel uses a custom license that permits all commercial use without attribution and only restricts redistribution of the raw assets as an asset pack. This kind of purpose-built license is often clearer than Creative Commons for game development because it is written specifically for that use case rather than trying to cover all creative fields.
Kenney assets use a CC0-equivalent custom license that places all assets in the public domain. This is as permissive as it gets. Unity Asset Store free assets typically use the Unity Asset Store EULA, which permits use in Unity projects but may restrict use in other engines. Always check whether a platform-specific license limits your engine choice before building your project around those assets.
When you encounter an unfamiliar custom license, look for answers to three specific questions. First, does it allow commercial use? Second, does it require attribution? Third, does it restrict redistribution? If the answers are yes, no, and only raw asset redistribution, the license is developer-friendly and safe for commercial games. If any of these answers are unclear, contact the creator for clarification before using the asset. A brief email asking "Can I use this in a commercial game sold on Steam?" gets a definitive answer that protects you better than any legal interpretation.
What Commercial Use Actually Means
Commercial use means any use that generates revenue, directly or indirectly. Selling a game on Steam for ten dollars is obvious commercial use. A free-to-play game with in-app purchases is commercial use. A free game with advertising is commercial use because the ads generate revenue. Even a free game that promotes a paid service or product could be considered commercial use under strict interpretation. If money flows toward you as a result of the work existing, it is probably commercial.
The gray areas tend to involve games that are free and generate no revenue but have commercial potential. A game jam game that might later become a commercial product exists in a gray area. Generally, the license applies at the time of use, so a non-commercial game jam project using CC-BY-NC assets becomes a problem only if you later commercialize it without removing those assets. If there is any chance your project will become commercial, use assets with commercial-friendly licenses from the start.
Portfolio use, where you include screenshots or gameplay footage of your project in a professional portfolio to attract job offers or clients, is another gray area. Most asset creators consider this acceptable even under non-commercial licenses because the asset itself is not being sold. However, if your portfolio directly generates client revenue, the interpretation becomes murkier. As a general practice, building everything with commercially-licensed assets from the beginning eliminates every gray area and lets you focus on making your game instead of worrying about legal nuances.
Practical License Management for Your Project
Create a license tracking document at the very start of your project and update it every time you add an external asset. For each asset, record the source URL, download date, license type, attribution requirements (if any), and the specific asset files it covers. This document takes five minutes to update per asset and can save you from legal problems, store listing rejections, or takedown requests down the road.
Store the original license text files alongside the assets in your project directory. If a website later changes its license terms, your local copy proves what terms were in effect when you downloaded the asset. This is not paranoia. Asset sites do occasionally change their licensing, and having documentation of the original terms is your protection. A folder structure like assets/external/[source-name]/LICENSE.txt keeps everything organized and auditable.
Before submitting your game to any storefront, do a final license audit. Go through your tracking document and verify that every external asset is accounted for and correctly licensed for commercial distribution on that specific platform. Remove any assets with uncertain licensing. Replace CC-BY-NC assets if your game generates any revenue. Compile your attribution credits for CC-BY assets. This audit is unglamorous work, but it is far better to catch a licensing issue during development than after your game is live and potentially generating a legal complaint.
AI-Generated Assets and Licensing Considerations
AI-generated game assets occupy an evolving legal space. The general consensus as of early 2026 is that purely AI-generated images are not copyrightable in most jurisdictions, which means they cannot receive copyright protection but also means no one else holds copyright over them. For game developers, this is largely positive: there is no copyright holder who could claim infringement when you use AI-generated assets.
When AI-generated assets are distributed through platforms like FreePixel, the platform license governs your usage rights rather than copyright law. The platform has curated, organized, and distributed the assets, and their license defines the terms of use. This is similar to how stock photo sites license photographs: you follow the site license regardless of the underlying copyright status of individual images.
The practical takeaway is straightforward. AI-generated assets from reputable platforms with clear licenses are safe for commercial game development. The legal landscape may continue to evolve, but assets downloaded under a specific license remain governed by that license regardless of future legal changes. Use AI-generated assets confidently, document your license compliance carefully, and stay informed about legal developments without letting uncertainty prevent you from making your game. The developers who ship games today using the tools available today are the ones who build successful careers, not the ones who wait for perfect legal clarity that may never arrive.