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Explain the difference between copyright on Public Domain, Shareware, Freeware and Commercial software?

Please do some research on the net !! I will pick a best answer !!

Public Comments

1. http://en.wikipedia.org/wiki/Public_Domain http://en.wikipedia.org/wiki/Shareware http://en.wikipedia.org/wiki/Freeware http://en.wikipedia.org/wiki/Commercial_software#Commercial Wikipedia is your friend. Please visit your friends. ;-)
2. If you need web research you are better off doing it yourself. It takes a lot of time to do good research, and the results would be too big to post here. Basically anything copyrighted requires at least a licence fee paid to the owner. Any form of freeware or public open source material is generally allowed use without fees, but distributing may be prohibited. Commercial software is only allowed use by the person buying the software, and only for the number of copies they have bought licences for. This is a very basic overview, the actual laws are extremely complex.
3. Public Domain: copyright has been relinquished by owner, therefore containing no copyright. Shareware: Covered by copyright and is commercial software. To use this program purchase is required to have a license for the program. Purchasers are allowed to distribute copies of the software (without license). Freeware: Covered by copyright but can be distributed for free as long as it is not for profit. Commercial: Most software purchased is commercial, when purchasing this software you are purchasing a license. The company that created the product owns the product and the products copyright.
4. A public domain work is a creative work that is not protected by copyright and which may be freely used by everyone. Shareware:Software that is available on a free limited trial basis. Freeware:Freeware is computer software that is available for use at no cost or for an optional fee Commercial software:Commercial software is computer software that is produced for sale or that serves commercial purposes