प्रतिदूतापसर्पाभ्यां दृश्यादृश्यैश्च रक्षिभिः ॥ कZ_०१.१६.३५च्द् ॥
pratidūtāpasarpābhyāṃ dṛśyādṛśyaiśca rakṣibhiḥ
By counter-envoys and covert agents, and by guards both visible and invisible, (they should be) protected.
Visible security deters overt threats; invisible security detects plots, monitors interactions, and enables deniable intervention—together reducing both physical and informational risk.