Historical Rules · 7 August 2020
Rule 702.16d
Official source text from the 7 August 2020 Rules release
A permanent with protection can’t be equipped by Equipment that have the stated quality or fortified by Fortifications that have the stated quality. Such Equipment or Fortifications become unattached from that permanent as a state-based action, but remain on the battlefield. (See rule 704, “State-Based Actions.”)