If you want to get into philosophy behind rights/liberties, look for Jeremy Bentham's writings on Government.
[blockquote]Benth.: FRG Ch. 5 Foot. 2 Para. 2/10 p. 494
1. That may be said to be my duty to do (understand political duty) which you (or some other person or persons) have a right to have me made to do. I then have a DUTY towards you: you have a RIGHT as against me.
Benth.: FRG Ch. 5 Foot. 2 Para. 3/10 p. 495
2. What you have a right to have me made to do (understand a political right) is that which I am liable, according to law, upon a requisition made on your behalf, to be punished for not doing.
Benth.: FRG Ch. 5 Foot. 2 Para. 4/10 p. 495
3. I say punished: for without the notion of punishment (that is of pain annexed to an act, and accruing on a certain account, and from a certain source) no notion can we have of either right or duty.[/blockquote]
And, of course, there's Hobbes's Leviathan, which defines just about everything, though perhaps not in a way useful to your argument. Of particular relevance to rights are the ultra-famous chapters 13-16.
Locke talks about rights (second treatise on govt, chapter 9), but got most (well, many) of his ideas from Hobbes.
For 20th century rights and liberties, try
Isaiah Berlin - "Two Concepts of Liberty" (1958)
Wesley Newcomb Hohfeld - "Fundamental Legal Conceptions" (1918)
Here's some professor's outline of Hohfeld's structure of rights (found on the web somewhere):
I have a right -> You have a duty
My right/power is your duty/liability to respect my claim
If I have a privilege (suspended duty), you suffer a derogation (suspended right)
My privilege is a suspension of your right.
If I have a power, you have a liability.
My power is an ability to change your social/legal/moral status.
If I have an immunity, you have a disability (suspended power).
My immunity is a protection against your power.
The prof then gives a statement incorporating all of these:
"Human rights of the innocent not to be bombed sometimes suffer derogations due to the privilege of the military to exercise its power exposing us to the liability of being indebted to it for giving us immunity against the attacks of the enemy thus forced to operate under a disability."
It should be obvious that Hohfeld is just expanding on Bentham (and maybe prior theorists, I'm not sure).