362 Chapter 15 Digital Citizenship Copyright Goodheart-Willcox Co., Inc. Figure 15-2. Goodheart-Willcox Publisher Each type of software has specifi c licensing permissions. Characteristics of Software Types Characteristics Software Type For-Purchase Freeware Shareware Cost • Must be purchased to use • Demo may be available • Never have to pay for it • Free to try • Pay to upgrade to full functionality Features • Full functionality • Full functionality • Limited functionality without upgrade The symbols used to indicate a trademark or service mark are called graphic marks. Some graphic marks can be used without being formally registered, as shown in Figure 15-1. License Agreement A licensing agreement is a contract that gives one party permission to market, produce, or use the product or service owned by another party. The agreement grants a license in return for a fee or royalty payment. When buying software, the purchaser agrees to follow the terms of a license. A license is the legal permission to use a software program. All software has terms of use that explain how and when the software may be used. Figure 15-2 explains the characteristics of different software licensing. Alternative usage rights for software programs are typically covered by the GNU General Public License (GNU GPL). The GNU GPL guarantees all users the freedom to use, study, share, and modify the software. The term open source applies to software that has had its source code made available to the public at no charge. Open-source software can be downloaded and used for free and can be modifi ed and distributed by anyone. However, part or all of the code of open- source software may be owned by an individual or organization. Figure 15-1. Goodheart-Willcox Publisher Graphic marks are symbols that indicate legal protection of intellectual property. Correct Usage of Graphic Marks TM SM ® Trademark, not registered Service mark, not registered Registered trademark