A perpetual usufruct is thus forbidden and "perpetual" might mean a long, but finite period, such as 99 years.

There have been legislative proposals to make it possible to convert perpetual usufruct into freehold ownership.

Following this, in September 1909, the Pruskie Kolegium Szkolne was written into the perpetual usufruct books at Rydzyna as the new owners of the Fundacja.

Perpetual usufruct (right of perpetual usufruct, RPU) is the English-language term often used by Polish lawyers to describe the Polish version of public ground lease.