If someone lawfully downloads something on the internet that is not
protected and sells it, and another person calls him a thief, or infringes
upon his right to sell that item, then the person who is harmed is the
seller - who in turn has a cause of action against the accuser for libel and
interference with the right to sell.

Be careful when accusing someone of being a thief, or they may take your
money from you.

Colin K7FM