Software publishers have implemented increasingly complex methods in an effort to stop unauthorized copying of software. The first software copy protection was applied to software for the Apple II, Atari 800, and Commodore 64 computers. Educational resources for reverse engineering and software cracking are, however, legal and available in the form of Crackme programs. It might be legal to use cracked software in certain circumstances. There have been lawsuits over cracking software. The distribution of cracked copies is illegal in most countries. A nukewar has shown that the protection may not kick in at any point for it to be a valid crack. nfo files that these type of cracks are not allowed for warez scene game releases.

A well-known example of a loader is a trainer used to cheat in games. A loader modifies the startup flow of a program and does not remove the protection but circumvents it. This has the advantage for a cracker to not include a large executable in a release when only a few bytes are changed. A patch is a small computer program that modifies the machine code of another program.

A keygen is a handmade product serial number generator that often offers the ability to generate working serial numbers in your own name. Some of these tools are called keygen, patch, or loader. Software cracking (known as 'breaking' mostly in the 1980s ) is the modification of software to remove or disable features which are considered undesirable by the person cracking the software, especially copy protection features (including protection against the manipulation of software, serial number, hardware key, date checks and disc check) or software annoyances like nag screens and adware.Ī crack refers to the means of achieving, for example a stolen serial number or a tool that performs that act of cracking. ( Learn how and when to remove this template message)

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