I always thought the two words are synonyms. (That belief somehow survived decades of philosophical reading, media, and more than a few moral/political philosophy courses.) Here in Australia,
liberty sounds like a USA word. We talk of
civil liberties etc, but not
liberty on its own like that. That sounds 18th C and/or estadounidense.
Your distinction sounds like (what I learnt as) Berlin's negative and positive liberty:
"Negative liberty is the absence of obstacles, barriers or constraints. One has negative liberty to the extent that actions are available to one in this negative sense. Positive liberty is the possibility of acting — or the fact of acting — in such a way as to take control of one's life and realize one's fundamental purposes. While negative liberty is usually attributed to individual agents, positive liberty is sometimes attributed to collectivities, or to individuals considered primarily as members of given collectivities."
"The idea of distinguishing between a negative and a positive sense of the term ‘liberty’ goes back at least to Kant, and was examined and defended in depth by Isaiah Berlin in the 1950s and ’60s."
https://plato.stanford.edu/entries/liberty-positive-negative...
That article goes on:
"Many authors prefer to talk of positive and negative freedom. This is only a difference of style, and the terms ‘liberty’ and ‘freedom’ are normally used interchangeably by political and social philosophers. Although some attempts have been made to distinguish between liberty and freedom (Pitkin 1988; Williams 2001; Dworkin 2011), generally speaking these have not caught on."
Ah that's what I thought!
Also, referring to your other comment, if a "despot can do whatever he wants to you or to your family", like disappear you in the night, and it's not a loss of security, I'm not sure what you mean by 'security'.