A license is the set of restrictions on what you can do with a game.
Source code and binaries (compiled executables) may have different licenses. A source code license restricts the use and availability of code, the binary license restrictes the use and availability of the game. To play a game, you usually only need to be concerned with the binary license. However, if the game is not available on your platform, or you have political objections to closed sourced proprietary software, the code license can also become important.
Usually, if the source code is available, the game is freeware. However, some games may license the art assets separately from the code. Thus, the code may have no cost, but the art assets may require a purchase. The "game license" is taken to be the most restrictive of these licenses.
This is not a legal definition. Many other sites go into exhaustive depths as to the nuances of these different licenses.
The source code is not available to the public. Only pre-compiled binaries are available. This makes the program very difficult to extend or modify. This is usually enforced by a EULA (End User License Agreement), which forbids the reverse-engineering of the executables.
Source code available
The source code is available but you are not allowed to reuse it, even if you release your derived works. Rarely used, since not being allowed to make modifications defeats the sense of releasing the source code.
There are two major types of open-source licenses:
- Permissive licenses, such as the BSD license, allow including the code in a work released under a different license, which can be more restrictive.
- Copyleft licenses, such as the GPL, have provisions that require all derivative works to be released under the same license.
Some authors are willing to release their work into the public domain, which means that no restrictions apply in any case. Very old works (usually 70 years after the death of their author) automatically lose all restrictions.
You must purchase the game before you can play it, and must not share the game with others. Many commercial games provide demos, which conflates Commercial with Shareware. Often the (arguably poor) distinction is made that Commercial has a box in a store shelf, while Shareware is internet only. Almost always closed-source.
Crippleware and demos
You can download and play the game without paying the original author; however, the game is limited in some way. For example, you can only play it for a certain length of time, or only part of the game is available, or some features are missing. To play the full game, you must purchase it. You are usually free to share the shareware version of the game with friends, but CD compilations are sometimes frowned upon. It is suggested that you contact the author before you redistribute in a large scale. Crippleware is often called shareware, because that sounds nicer.
You can download and play the game without paying the original author; however, you are morally obligated to pay the author if you like it enough to keep playing. Sharing and redistributing the game are encouraged.
You can download and play the game without paying the original author. There is no limited time period to play the game and the entire game is available to you. While you can freely give the game to your friends, many freeware authors frown on CD compilations. It is suggested you contact the author if you wish to redistribute in a large scale.
Postcardware and emailware
Freeware license terms apply. If you would like to thank the author for creating and maintaining a game you are encouraged to send him/her a postcard. Emailware is the more modern variant, which asks for the said email to be sent to the author.
Free Cultural Works
In order to find the suitable terminology for the freedom of use with the least restrictive of licenses, the Free Software Definition was interpreted with the help of The Freedom Defined definition. In order to comply with proposed standards, the work must have certain characteristics:
- Freedom to use the work itself.
- Freedom to use the information in the work for any purpose.
- Freedom to share copies of the work for any purpose.
- Freedom to make and share remixes and other derivatives for any purpose.
The Creative Commons License
In the light of Free Cultural Works define, the non-profit Creative Commons organization had put together a set of licensing acts to help authors decide how to share, improve and let others decide how to contribute. The license can either be a Free Cultural Works compliant or a more restrictive one (NC). It is provided as a distinct alternative to "All Rights Reserved" culture. The author(s) can choose to permit:
- Modifications to work itself.
- Commercial uses of his work.
- Having License Jurisdiction or not.
The original work can further be enveloped with CC-BY or BY-SA stamps, or restricted with BY-NC, BY-ND, BY-NC-SA, and BY-NC-ND deeds so they no longer support the arguments with the Freedom Defined (the NC and ND explanations).