Although most trial software products are only time-limited, some also have function limitations. After that trial period (usually 15 to 90 days), the user can decide whether to buy the software or not. The trial software allows the user to evaluate the software for a limited time. Demonstrations are not usually time-limited (like Trial software), but functionality is limited.

In some cases, all features are disabled until the license is purchased. Demoĭemo programs have a limited functionality free, but charges for an advanced feature set or removal of ads from the program interface. In some cases, ads may be displayed to users. Basically, the product is offered Free to Play (Freemium) and the user can decide whether he wants to pay money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game. This license is commonly used for video games and that allows users to download and play the game for free. There are many different open source licenses, but all must comply with the definition of open source – in short: the software is free to use, modify and share. Programs published under this license may be used free of charge for personal and commercial purposes. Open source software is software with source code that anyone can review, modify, or improve. Free products can be used free of charge for both personal and professional (commercial) use. Free programs can be downloaded for free and without any time limits.

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