Licenses are permanently attached to your account and cannot be easily transferred, though they can sometimes be shared via Steam Family Sharing under specific conditions.
A new notice in the Steam checkout cart explicitly states that you are purchasing a license rather than owning the product outright.
When you "buy" a digital product, you are granted a non-transferable license to use it.
Recent updates to the Steam interface clarify exactly what happens when you "buy" a game:
Programma - Buysteam Skachat
Licenses are permanently attached to your account and cannot be easily transferred, though they can sometimes be shared via Steam Family Sharing under specific conditions.
A new notice in the Steam checkout cart explicitly states that you are purchasing a license rather than owning the product outright. programma buysteam skachat