Protection Circles & Other Circle magic

[Warshield73]

I am sure this is out there but once these are created can any mage activate them or is it only the mage that has created it?

[Franko Tyrador]

Duration: Permanent until destroyed or deactivated by the circle maker. Once activated, the magic circle remains functioning indefinitely; all components are magically kept fresh. This means anybody who knows how, can enter the circle and use it, unless it's "sealed."
To use an active circle of any kind, the user must know the power words and pump in five P.P.E. points. These simple requirements mean
even a person without magic knowledge can use an active circle provided he or she has proper instructions and five P.P.E. points available
to him/her. The desire to use the circle is enough to focus and allow the release of the P.P.E.

pg 138, core book

[Warshield73]

Thank you. I was specifically looking at the Rifts spell but I looked all over the fantasy book for it including that page but I must have missed it. I read the fantasy books a fair bit but when I do it is mainly for lore and history so I'm not as good at finding information in those books.

[Marcethus]

IIRC there are some Circles that have a duration and then when that duration expires they can be reactivated by anyone that has the PPE to activate the circle.