Is that which was caused by something unlawful itself unlawful, and is it considered unlawful to benefit from information or an action if its source or the means of obtaining it was through unlawful means?

There is no harm in accepting a gift made with pirated software, because the prohibition of infringing upon the software is not related to the gift itself. There is no connection between the prohibition of looking at women and working in the same place; work is permissible.