Garry's Mod Anti Prop Kill Script

function AntiPropPushPickup( userid, ent )
    if ent:GetClass() == "prop_physics" then
        ent:SetCollisionGroup( COLLISION_GROUP_WEAPON )
        local r,g,b,a = ent:GetColor();
        ent:SetColor(r,g,b,180)
    end
end
hook.Add( "PhysgunPickup", "AntiPropPushPickup", AntiPropPushPickup )

function AntiPropPushDrop( pl, ent )
    if ent:GetClass() == "prop_physics" then
        ent:GetPhysicsObject():SetVelocity( Vector(0,0,0) )
        ent:GetPhysicsObject():AddAngleVelocity(ent:GetPhysicsObject():GetAngleVelocity( )*-1)
        ent:SetCollisionGroup( COLLISION_GROUP_NONE )
        local r,g,b,a = ent:GetColor();
        ent:SetColor(r,g,b,255)
    end
end
hook.Add("PhysgunDrop", "AntiPropPushDrop", AntiPropPushDrop);

function AntiPropPushFreezing(weapon, physobj, ent, ply)
    if ent:GetClass() == "prop_physics" then
        local rad = ent:BoundingRadius()*1.3
        local inside = false
        for k, ply in pairs(player.GetAll()) do
            if (ply:GetPos():Distance(ent:LocalToWorld(ent:OBBCenter())) < rad) then
                inside = true
            end
        end
        for k, ply in pairs(player.GetAll()) do
            local pos = ply:GetPos() + Vector(0,0,64)
            if (pos:Distance(ent:LocalToWorld(ent:OBBCenter())) < rad) then
                inside = true
            end
        end

        if inside then
            ent:SetCollisionGroup( COLLISION_GROUP_WEAPON )
            local r,g,b,a = ent:GetColor();
            ent:SetColor(r,g,b,100)
        else
            ent:SetCollisionGroup( COLLISION_GROUP_NONE )
            local r,g,b,a = ent:GetColor();
            ent:SetColor(r,g,b,255)
        end
    end
end
hook.Add("OnPhysgunFreeze", "AntiPropPushFreezing", AntiPropPushFreezing)

function AntiPropKill(victim, attacker)
    if(not attacker:IsPlayer()) then
        if (attacker:GetClass() == "prop_physics") then
        return false
        end
    end
end

hook.Add( "PlayerShouldTakeDamage", "AntiPropKill", AntiPropKill)

hook.Add("PhysgunDrop", "AntiPP", function(ply, ent)
    ent:SetCollisionGroup(COLLISION_GROUP_WORLD) --Collide with world only
    ent:SetColor(255,255,255,180) --Opacify it so it's transparent
    timer.Simple(1, function()
        ent:SetCollisionGroup(COLLISION_GROUP_NONE) --Reset collision
        ent:SetColor(255,255,255,255) --Reset opacity
    end)
end)