Executing the software is generally considered making a copy. ... So, downloading and running copyrighted software where you don't have a license to do so is copyright infringement and thus is not permitted under U.S. law. Cracked software is available on the Internet. That does not mean it is legal.
The people who pirate these games or softwares need a way through which you can use these applications without paying for them, so what they generally do is that they decrypt the copyright protection installed on the software and then reverse engineer it which leads to a crack or many times a key generator (mostly ...
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