diff --git a/init.lua b/init.lua
index 0dec9e5..dc7d733 100644
--- a/init.lua
+++ b/init.lua
@@ -44,6 +44,27 @@ else
 	dofile(worldpath.."/moretrees_settings.txt")
 end
 
+-- Boilerplate to support localized strings if intllib mod is installed.
+
+local S
+if moretrees.intllib_modpath then
+    dofile(moretrees.intllib_modpath.."/intllib.lua")
+    S = intllib.Getter(minetest.get_current_modname())
+else
+    S = function ( s ) return s end
+end
+moretrees.gettext = S
+
+-- infinite stacks checking
+
+if minetest.get_modpath("unified_inventory") or not minetest.setting_getbool("creative_mode") then
+	moretrees.expect_infinite_stacks = false
+else
+	moretrees.expect_infinite_stacks = true
+end
+
+-- tables, load other files
+
 moretrees.cutting_tools = {
 	"default:axe_bronze",
 	"default:axe_diamond",
@@ -56,6 +77,7 @@ moretrees.cutting_tools = {
 	"titanium:axe",
 }
 
+dofile(modpath.."/ownership.lua")
 dofile(modpath.."/tree_models.lua")
 dofile(modpath.."/node_defs.lua")
 dofile(modpath.."/biome_defs.lua")
diff --git a/node_defs.lua b/node_defs.lua
index 897a3c7..a4f1346 100644
--- a/node_defs.lua
+++ b/node_defs.lua
@@ -40,6 +40,14 @@ for i in ipairs(moretrees.treelist) do
 			is_ground_content = true,
 			groups = {tree=1,snappy=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
 			sounds = default.node_sound_wood_defaults(),
+			on_place = function(itemstack, placer, pointed_thing)
+				local keys=placer:get_player_control()
+				local pos = pointed_thing.under
+				if not moretrees:node_is_owned(pos, placer) then
+					minetest.rotate_and_place(itemstack, placer, pointed_thing,
+						moretrees.expect_infinite_stacks, { invert_wall = keys.sneak })
+				end
+			end
 		})
 
 		minetest.register_node("moretrees:"..treename.."_planks", {
@@ -378,6 +386,14 @@ minetest.register_node("moretrees:rubber_tree_trunk_empty", {
 	groups = {tree=1,snappy=1,choppy=2,oddly_breakable_by_hand=1,flammable=2},
 	sounds = default.node_sound_wood_defaults(),
 	paramtype2 = "facedir",
+	on_place = function(itemstack, placer, pointed_thing)
+		local keys=placer:get_player_control()
+		local pos = pointed_thing.under
+		if not moretrees:node_is_owned(pos, placer) then
+			minetest.rotate_and_place(itemstack, placer, pointed_thing,
+				moretrees.expect_infinite_stacks, { invert_wall = keys.sneak })
+		end
+	end
 })
 
 minetest.register_abm({
diff --git a/ownership.lua b/ownership.lua
new file mode 100644
index 0000000..e075888
--- /dev/null
+++ b/ownership.lua
@@ -0,0 +1,35 @@
+
+local S = moretrees.gettext
+
+function moretrees:node_is_owned(pos, placer)
+	local ownername = false
+	if type(IsPlayerNodeOwner) == "function" then					-- node_ownership mod
+		if HasOwner(pos, placer) then						-- returns true if the node is owned
+			if not IsPlayerNodeOwner(pos, placer:get_player_name()) then
+				if type(getLastOwner) == "function" then		-- ...is an old version
+					ownername = getLastOwner(pos)
+				elseif type(GetNodeOwnerName) == "function" then	-- ...is a recent version
+					ownername = GetNodeOwnerName(pos)
+				else
+					ownername = S("someone")
+				end
+			end
+		end
+
+	elseif type(isprotect)=="function" then 					-- glomie's protection mod
+		if not isprotect(5, pos, placer) then
+			ownername = S("someone")
+		end
+	elseif type(protector)=="table" and type(protector.can_dig)=="function" then 					-- Zeg9's protection mod
+		if not protector.can_dig(5, pos, placer) then
+			ownername = S("someone")
+		end
+	end
+
+	if ownername ~= false then
+		minetest.chat_send_player( placer:get_player_name(), S("Sorry, %s owns that spot."):format(ownername) )
+		return true
+	else
+		return false
+	end
+end