This is a cautionary tale for preservationists. My current preservation project is still not open because we are very slowly reviewing the code to make sure we don't accidentally include any IP when we open the source code. The real things that get you are similar to what happened here: codecs, graphics libraries, and a really big one to look out for is fonts. It'd be great if there was a scanner that could detect this stuff, but unfortunately, the scanning tools out there tend to go the other way like Black Duck: they detect open source code, not closed source.
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