See the entire entry for dāṯ, dāṯā n.f./m. law

Dan6:9 :כְּעַן מַלְכָּא תְּקִים אֱסָרָא : now then the King should establish a prohibition

See the entire entry for kˁn adv. now

Dan6:9 :תְּקִים אֱסָרָא וְתִרְשֻם כְּתָבָא דִּי לָא לְהַשְנָיָה : you should establish a prohibition and write down a decree which is not to be violated

See the entire entry for šny vb. to be different