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When computing left the university walls and became popular at every home as personal computers, more programmers started to create the code,shared as a part of hobby matters first, and later became professional software sold quite often for enormous price in the comparison to the utility of these programs.
As many of people wanted to share, but not so many to pay the programmers developed the protection preventing from unauthorised copy of the product. There were many of ways to bypass the security code in those early days but the greedy coders became smarter and smarter and developed more and more sophisticated copy protection.
And that is the time in our history when came into the existence crack.
A crack is a program, set of instructions or patch used to remove copy protection from a piece of software or to unlock features from a demo or time-limited trial.
Nowadays writing the crack needs the professional skills and often is comissioned by the group of people, who want to use the special software only for their purposes. The free unlocking programs that anyone can find in thenet are not made by altruists, who say that the information needs to be free. Almost everytime the cracking program while unlocking the needed feature starts a virus or a trojan enabling hackers to take control over the computer.
To make internet and your computer safe never use the cracking programs found over the web.