diff --git a/README.md b/README.md
index c4c39fd..cf04024 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ git clone https://github.com/realmicu/minetest-micupack.git micupack
   Devices for interacting with SaferLua Controller from TechPack mod:
 
   - Memory Copier - portable dongle to transfer code between SL Controllers in much simpler
-    and faster way than copying it with text books
+    and faster way than copying it with text books; can be write-protected
   - Memory Programmer - improved Memory Copier, with read/write protection to prevent
     accidental memory loss and code injection functionality (works like original Programmer
     but for SL Controllers); it allows to replace special marker in init() section
diff --git a/slprogtools/init.lua b/slprogtools/init.lua
index 03157a6..a3fc91e 100644
--- a/slprogtools/init.lua
+++ b/slprogtools/init.lua
@@ -155,6 +155,7 @@ local function formspec_copier(tool, tubelib_id)
 	local init_flag = tool_meta:get_int("init_flag") ~= 0
 	local loop_flag = tool_meta:get_int("loop_flag") ~= 0
 	local note_flag = tool_meta:get_int("note_flag") ~= 0
+	local ro_flag = tool_meta:get_int("ro_flag") ~= 0
 	local init_len = string.len(tool_meta:get_string("init_code"))
 	local loop_len = string.len(tool_meta:get_string("loop_code"))
 	local note_len = string.len(tool_meta:get_string("note_text"))
@@ -168,12 +169,14 @@ local function formspec_copier(tool, tubelib_id)
 	"checkbox[0.5,1.5;init_flag;include " .. msg_M .. "init()" .. msg_W ..
 		" code (size: " .. tostring(init_len) .. ");" ..
 		tostring(init_flag) .. "]" ..
-	"checkbox[0.5,2.25;loop_flag;include " .. msg_M .. "loop()" .. msg_W ..
+	"checkbox[0.5,2;loop_flag;include " .. msg_M .. "loop()" .. msg_W ..
 		" code (size: " .. tostring(loop_len) .. ");" ..
 		tostring(loop_flag) .. "]" ..
-	"checkbox[0.5,3;note_flag;include " .. msg_M .. "notes" .. msg_W ..
+	"checkbox[0.5,2.5;note_flag;include " .. msg_M .. "notes" .. msg_W ..
 		" text (size: " .. tostring(note_len) .. ");" ..
 		tostring(note_flag) .. "]" ..
+	"checkbox[0.5,3;ro_flag;read only (archive mode);" ..
+		tostring(ro_flag) .. "]" ..
 	"button_exit[5,0.75;1.5,1;clear;Clear]" ..
 	"button_exit[5,1.5;1.5,1;download;Download]" ..
 	"button_exit[5,2.25;1.5,1;upload;Upload]" ..
@@ -312,6 +315,10 @@ local function init_metadata_copier(player, tool)
 	local tool_meta = tool:get_meta()
 	local tool_upd = false
 	local metatable = tool_meta:to_table()
+	if not metatable.fields["ro_flag"] then
+		tool_meta:set_int("ro_flag", 0)
+		tool_upd = true
+	end
 	if not metatable.fields["init_flag"] then
 		tool_meta:set_int("init_flag", 1)
 		tool_upd = true
@@ -350,10 +357,6 @@ local function init_metadata_programmer(player, tool)
 		tool_meta:set_int("wo_flag", 0)
 		tool_upd = true
 	end
-	if not metatable.fields["ro_flag"] then
-		tool_meta:set_int("ro_flag", 0)
-		tool_upd = true
-	end
 	if not metatable.fields["prog_mark"] then
 		tool_meta:set_string("prog_mark", def_marker)
 		tool_upd = true
@@ -461,20 +464,20 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	end
 	if fields.clear or fields.download or fields.upload then
 		-- copier window or memory tab buttons
-		-- (this must work also for copier which has no RW flags)
+		-- (this must work also for copier which has no WO flag)
 		local ro_flag = tool_meta:get_int("ro_flag") == 1
 		local wo_flag = tool_meta:get_int("wo_flag") == 1
 		if (fields.clear or fields.download) and ro_flag then
 			play_beep_err(player_name)
 			minetest.chat_send_player(player_name,
 				msg_Y .. "[" .. label .. "] " .. msg_R ..
-				"Device memory is write-protected! (see security tab)")
+				"Device memory is write-protected!")
 			return true
 		elseif fields.upload and wo_flag then
 			play_beep_err(player_name)
 			minetest.chat_send_player(player_name,
 				msg_Y .. "[" .. label .. "] " .. msg_R ..
-				"Device memory is read-protected! (see security tab)")
+				"Device memory is read-protected!")
 			return true
 		end
 		local init_flag = tool_meta:get_int("init_flag") ~= 0