I'm looking for a word that denotes the fact that something cannot be taken away (or deprived of) once it is acquired (like an experience) as in:
Your experiences cannot be taken away from you, man, they stay with you forever.
I was thinking of something along the lines of: "experiences, as a rule, are indivestable so much unlike rights and dignities", but only in a more modern non-obsolete kind of way (very few people in my control group actually knew what "indivestable" meant). I need this stuff for an ad, meaning it must be easily understood by both the young and the old, the bright and the dim, the rich and the poor, well, you catch my drift, right.
I am in need of a word that says that once you acquire something, through investing time and effort, it is yours forever, no matter what it just cannot be taken away from you. It is not granted to you by anyone, and it is something you must "take" to have.