[sinkspur]

You're thinking of a "celebret."

A celebret is a testimonial given to a priest when traveling that he is in good standing, with the accompanying request that he be permitted to say Mass. Diocesan priests receive these from their bishops; religious from their superiors; Eastern Rite clerics, traveling through Latin jurisdictions, from the Congregation for the Oriental Church. The date on them should be recent.

Your information is incorrect. Chapels cannot be set up outside the jurisdiction of the local bishop, and priests cannot licitly celebrate Mass in them without the permission of the local bishop.

[Canticle_of_Deborah]

You're thinking of a "celebret."

Okay.

This priest received his from Rome. The local bishop can't touch him.