Is it a mortal sin to buy pirated DVD films?

Assuming that the other required circumstances are present, is it a serious enough sin to buy pirated DVD films to be considered mortal?

Assuming it is, is it a mortal sin of omission to not inform a close relative (i.e. a parent) that purchasing such pirated DVD films is a mortal sin?

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**Recommended Reading:
*]Is Downloading Music a sin?
*]How do you know when you have committed a mortal sin?

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