Conditions customized for each purchase. i can do?

[daicon]

Is there any way to add customizable acceptance conditions?

That is to say,

For every purchase , conditions are customized for each user and for that purchase.

For instance....

blablablablabla
Buy Product X for UsernameX ..
bla
BLA bla

I explain?

[GJC Web Design]

I explain?

nope.. clear as mud I'm afraid...