Here is a scenario I've come across:
A college student who owns a lot of music CDs lives with their family during holidays. Their father and several other family members saves all or most of the hardcopy music in the house onto their computers. The father says this is legal because the music is staying within the family.
It seems a bit iffy to me. Technically the father is receiving something he hasn't paid for, although it seems a bit odd to say he should buy his own copy of music that can already be heard in his house for several months a year. It makes sense to me that he can save the hardcopies that belong to other members of the family who reside there 24/7, as in his wife, but otherwise, when is it legal?