Software License Types Explained

Most paid software, from Microsoft Office to Adobe apps, uses a proprietary commercial license. You are buying the right to use the software under specific conditions, not the software itself. The source code stays closed, and you typically cannot copy, modify, redistribute, or reverse-engineer it.

These licenses come in flavors: a one-time perpetual license for a specific version, or a subscription that grants access only while you keep paying. The fine print, found in the End User License Agreement (EULA), spells out how many devices you can install on and what counts as misuse.

These three are easy to confuse but legally distinct:

• Freeware is free to use indefinitely, but the source code is usually closed and you cannot modify or sell it. Many utilities and reader apps are freeware.
• Shareware lets you try the software, often with limited features or nagging reminders, with the expectation that you will pay to unlock the full version.
• Free trial software gives you the full product for a limited time, after which it stops working or reverts to a limited mode until you buy a license.

The key point: free to download does not always mean free to keep using.

Open source means the source code is publicly available and you can study, modify, and share it, subject to the license terms. There are two broad families. Permissive licenses such as MIT, Apache 2.0, and BSD let you do almost anything, including using the code in closed commercial products, as long as you keep the copyright notice.

Copyleft licenses, most famously the GNU GPL, are stricter. If you distribute software built on GPL code, you generally must release your changes under the same license. This is why companies pay close attention to which open-source license a library uses before building it into a product.

A small number of works are placed in the public domain or released under permissive Creative Commons terms, meaning the author has waived most or all rights. Tools released under licenses like the Unlicense or CC0 can be used freely with no attribution required. This is common for code snippets, fonts, and creative assets rather than full applications.

Creative Commons licenses are more common for media, images, and documentation than for software, and they come in variations that may require attribution or forbid commercial use. Always check which CC variant applies before reusing an asset.

For everyday personal use, the practical takeaway is simple: a free trial will expire, freeware is yours to keep but not to resell, and open source gives you the most freedom. For business use the stakes are higher, because using a 'free for personal use' app at work or shipping GPL code in a closed product can create real legal exposure.

Whenever you download software from this site or anywhere else, the license tells you your rights. Skimming the type of license takes seconds and prevents expensive misunderstandings down the line.