
Jus ad rem is a Latin term of the civil law, meaning `a right to a thing:` that is, a right exercisable by one person over a particular article of property in virtue of a contract or obligation incurred by another person in respect to it and which is enforceable only against or through such other person. It is thus distinguished from jus in re w.....
Found on
http://en.wikipedia.org/wiki/Jus_ad_rem

This phrase is applied to designate the right a man has in relation to a thing; it is not the right in the thing itself, but only against the person who has contracted to deliver it. It is a mere imperfect or inchoate right. This phrase is nearly equivalent to chose in action.
Found on
http://www.lectlaw.com/def/j052.htm
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