In the 1970s and early 1980s, the software industry began using technical measures ( such as only distributing binary copies of computer programs ) to prevent computer users from being able to study and modify software.

In the 1970s and early 1980s, the software industry began using technical measures ( such as only distributing binary copies of computer programs ) to actually prevent computer users from being able to use reverse engineering techniques to study and customize software they had paid for.

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