The software license is an agreement stating the terms and conditions of use of computer programs. Using these computer programs, you agree to the terms of the license.
OEM (abbr. Original Equipment Manufacturer) – license for system builders, under such a license can only be purchased with hardware, in the form of pre-installed software, for example, you buy a computer in the store with Windows or Microsoft Office, use the license key on another computer is prohibited by condition of license OEM.
Adware is the Abbreviation for Advertisement and Software, the software distributed for free (without source code), but the author of the program earns revenue by displaying ads in the program interface. Such applications include all known uTorrent. Often, such applications are detected by antiviruses as malicious.
Freeware — Programs that you can use for free, but copyright pred will nalezhat author, so source code is closed.
Open Source (software open source) is an alternative Freeware, which aims to provide free access to software for all. License grants its users the right to legally copy, distribute, analyse, modify and improve, and expand the product.
DEMO is a free copy of the program tothe young girl who has very limited features or time usage, the evaluation version before purchase.
Trial is a type of license for computer software that allows you to use it within a predetermined period of time, usually without limitations. After a specified time only, there is a lock, and the only thing you can do is to buy the program or remove it from the computer.