[QUOTE]You seem to like the word "parasite" a lot. But in truth, the relationship between BSD developers and Sony is commensalism.
Well, they're "parasites" because
1) Someone took their resources to do the job but they're utterly unwilling to reward it.
2) They also would not commit back.
3) They produce DRM-crippled things and making it hard for consumers to become creators and authors. Hence some harm is done.
So in overall for external observer (like me) they just consume something without return and causing harm. Hence more resembling a parasites if we'll try to evaluate whole picture of such activity.
And both DRM and closed source are utterly bad since we can also lose our heritage. Imagine it now: 100 years later humans could fail to view old video. Because DRM scheme was not documented, no sources left to parse data format, etc. It's a really crapy and irresponsible approach to my taste.