I think you're misinformed. Downloading per say is not illegal - but downloading copyrighted items IS illegal. The courts uphold that the act of downloading from a site is not illegal - but if you download copyrighted material, you are committing a crime.
And as for your 10 year expiry, you may want to do some more research, as I'm quite sure that's misguided as well:
"The law automatically protects a work that is created and fixed in a tangible
medium of expression on or after January 1, 1978, from the moment of its
creation and gives it a term lasting for the author's life plus an additional 70
years." (US Copyright office)
If your claim was true, any movie over 10 years old could be re-released by any other company? That's just not something that sounds even sort of true.
Copyright infringement is always illegal - whether prosecuted or not, it's clearly an illegal act.