Before: [Your Turn] While your opponent has no Digimon with with more digivolution cards than this Digimon, this Digimon gains <Jamming> (This Digimon can't be deleted in battles against Security Digimon.).
After: [Your Turn] While your opponent has no Digimon with with as many or more digivolution cards than this Digimon, this Digimon gains <Jamming> (This Digimon can't be deleted in battles against Security Digimon.).
Read as the errata when playing.