High Quality Content by WIKIPEDIA articles! Software copyright is the relatively recent extension of copyright law to machine-readable software. While many of the legal principles and policy debates concerning software copyright have close parallels in other domains of copyright law, there are a number of distinctive issues that arise with software. This article will primarily focus on topics peculiar to software. Software copyright is commonly used by proprietary software companies to prevent the unauthorized copying of their software. Open source licenses also rely on copyright law to enforce their terms. For instance, copyleft licenses impose a duty on licensees to share their modifications to the copylefted work under some circumstances. No such duty would apply had the software in question been in the public domain.

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