Black Duck's main offering, protexIP (IP, as in "intellectual property"), contains a library of open-source programs that software writers frequently incorporate into larger applications.

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Conversely, having realised that they can economise on resources and garner good ideas, proprietary software firms are increasingly taking a liking to open-source programs, albeit mostly at the edges of their offerings.

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The open source movement is campaigning hard to persuade even the largest software companies, like Microsoft, to open up their programs and let everyone look for errors or security problems.

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