VARIOUS PRODUCT OF OS
There may be limited period of time after which the software will disable itself.
Closed-source programs are owned by someone (or some organization) and distributed through a variety of retail channels including the owner's website.
Example: Windows, Mac OS, IOsS, Windows 7,8,10, Windows Server 2008, Windows Server 2004
Open-source software (OSS) is computer software with its source code made available with a license in which the copyright holder provides the right to study, change and distribute the software to software to anyone and for any purpose.
Example: Linux, Unix, Symbian, Android, Ubuntu, Mandriva, K-Buntu, Red Hat.