diff --git a/epan/dissectors/packet-acn.c b/epan/dissectors/packet-acn.c
index d637385f12..f6290c2c4e 100644
--- a/epan/dissectors/packet-acn.c
+++ b/epan/dissectors/packet-acn.c
@@ -85,6 +85,7 @@ void proto_reg_handoff_acn(void);
 #define ACN_PROTOCOL_ID_BROKER        0x00000009
 #define ACN_PROTOCOL_ID_LLRP          0x0000000A
 #define ACN_PROTOCOL_ID_EPT           0x0000000B
+#define ACN_PROTOCOL_ID_DMX_3         0x50430001
 
 #define ACN_ADDR_NULL                 0
 #define ACN_ADDR_IPV4                 1
@@ -595,6 +596,12 @@ static int hf_acn_dmx_count = -1;
 static int hf_acn_dmx_2_start_code = -1;
 static int hf_acn_dmx_data = -1;
 
+static int hf_acn_postamble_key_fingerprint = -1;
+static int hf_acn_postamble_seq_type = -1;
+static int hf_acn_postamble_seq_hi = -1;
+static int hf_acn_postamble_seq_low = -1;
+static int hf_acn_postamble_message_digest = -1;
+
 /* static int hf_acn_dmx_dmp_vector = -1; */
 
 /* Try heuristic ACN decode */
@@ -752,6 +759,7 @@ static const value_string acn_protocol_id_vals[] = {
   { ACN_PROTOCOL_ID_BROKER, "Broker Protocol" },
   { ACN_PROTOCOL_ID_LLRP,   "Low Level Recovery Protocol" },
   { ACN_PROTOCOL_ID_EPT,    "Extensible Packet Transport Protocol" },
+  { ACN_PROTOCOL_ID_DMX_3,  "Pathway Connectivity Secure DMX Protocol" },
   { 0,       NULL },
 };
 
@@ -2816,6 +2824,13 @@ static const value_string magic_ip_configuration_vals[] = {
   { 0, NULL }
 };
 
+static const value_string security_seq_type_vals[] = {
+  { 0, "Time (ms since epoch)" },
+  { 1, "Volatile" },
+  { 2, "Non-volatile" },
+  { 0, NULL }
+};
+
 static const value_string rdmnet_llrp_vector_vals[] = {
   { RDMNET_LLRP_VECTOR_PROBE_REQUEST, "LLRP probe request" },
   { RDMNET_LLRP_VECTOR_PROBE_REPLY,   "LLRP probe reply" },
@@ -3240,6 +3255,7 @@ is_acn(tvbuff_t *tvb)
   if (is_acn_or_rdmnet_over_udp(tvb, &protocol_id)) {
     if ((protocol_id == ACN_PROTOCOL_ID_DMX) ||
         (protocol_id == ACN_PROTOCOL_ID_DMX_2) ||
+        (protocol_id == ACN_PROTOCOL_ID_DMX_3) ||
         (protocol_id == ACN_PROTOCOL_ID_SDT))
       return TRUE;
   }
@@ -5435,7 +5451,7 @@ dissect_acn_dmx_data_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
   switch (vector) {
     case ACN_DMP_VECTOR_SET_PROPERTY:
       dmx_start_code = tvb_get_ntohs(tvb, data_offset);
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         proto_tree_add_item(pdu_tree, hf_acn_dmx_2_first_property_address, tvb, data_offset, 2, ENC_BIG_ENDIAN);
       } else {
         proto_tree_add_item(pdu_tree, hf_acn_dmx_start_code, tvb, data_offset, 2, ENC_BIG_ENDIAN);
@@ -5447,7 +5463,7 @@ dissect_acn_dmx_data_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
       proto_tree_add_item(pdu_tree, hf_acn_dmx_count, tvb, data_offset, 2, ENC_BIG_ENDIAN);
       data_offset += 2;
 
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         dmx_2_start_code = (guint8)tvb_get_ntohs(tvb, data_offset - 1);
         proto_tree_add_item(pdu_tree, hf_acn_dmx_2_start_code, tvb, data_offset, 1, ENC_BIG_ENDIAN);
         data_offset += 1;
@@ -5485,7 +5501,7 @@ dissect_acn_dmx_data_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
         leading_char = ' ';
       }
       /* add a snippet to info (this may be slow) */
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         info_start_code = dmx_2_start_code;
       }
       else {
@@ -5628,7 +5644,7 @@ dissect_acn_dmx_base_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
   /* process based on vector */
   switch (vector) {
     case ACN_DMP_VECTOR_SET_PROPERTY:
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         proto_tree_add_item(pdu_tree, hf_acn_dmx_source_name, tvb, data_offset, 64, ENC_UTF_8|ENC_NA);
         data_offset += 64;
       } else {
@@ -5640,7 +5656,7 @@ dissect_acn_dmx_base_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
       proto_tree_add_item(pdu_tree, hf_acn_dmx_priority, tvb, data_offset, 1, ENC_BIG_ENDIAN);
       data_offset += 1;
 
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         proto_tree_add_item(pdu_tree, hf_acn_dmx_2_reserved, tvb, data_offset, 2, ENC_BIG_ENDIAN);
         data_offset += 2;
       }
@@ -5649,7 +5665,7 @@ dissect_acn_dmx_base_pdu(guint32 protocol_id, tvbuff_t *tvb, packet_info *pinfo,
       proto_tree_add_item(pdu_tree, hf_acn_dmx_sequence_number, tvb, data_offset, 1, ENC_BIG_ENDIAN);
       data_offset += 1;
 
-      if (protocol_id == ACN_PROTOCOL_ID_DMX_2) {
+      if (protocol_id == ACN_PROTOCOL_ID_DMX_2 || protocol_id == ACN_PROTOCOL_ID_DMX_3) {
         option_flags = tvb_get_guint8(tvb, data_offset);
         pi = proto_tree_add_uint(pdu_tree, hf_acn_dmx_2_options, tvb, data_offset, 1, option_flags);
         flag_tree = proto_item_add_subtree(pi, ett_acn_dmx_2_options);
@@ -7024,6 +7040,7 @@ dissect_acn_root_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int of
   switch (protocol_id) {
     case ACN_PROTOCOL_ID_DMX:
     case ACN_PROTOCOL_ID_DMX_2:
+    case ACN_PROTOCOL_ID_DMX_3:
       if (global_acn_dmx_enable) {
         end_offset = dissect_acn_root_pdu_header(tvb, pinfo, pdu_tree, ti, ": Root DMX", &offset, pdu_flags, pdu_length, &data_offset, &data_length, last_pdu_offsets, 1, &pdu_flvh_length, 1);
 
@@ -7101,6 +7118,7 @@ dissect_acn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
   guint32          old_offset;
   guint32          end_offset;
   acn_pdu_offsets  pdu_offsets = {0,0,0,0,0};
+  guint16          postamble_size;
 
 /*   if (!is_acn(tvb)) { */
 /*     return 0;         */
@@ -7116,17 +7134,31 @@ dissect_acn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
   /* add preamble, postamble and ACN Packet ID */
   proto_tree_add_item(acn_tree, hf_acn_preamble_size, tvb, data_offset, 2, ENC_BIG_ENDIAN);
   data_offset += 2;
+  postamble_size = tvb_get_guint16(tvb, data_offset, ENC_BIG_ENDIAN);
   proto_tree_add_item(acn_tree, hf_acn_postamble_size, tvb, data_offset, 2, ENC_BIG_ENDIAN);
   data_offset += 2;
   proto_tree_add_item(acn_tree, hf_acn_packet_identifier, tvb, data_offset, 12, ENC_UTF_8 | ENC_NA);
   data_offset += 12;
 
-  /* one past the last byte */
+  /* one past the last data byte, not including the postamble */
   end_offset = data_offset + tvb_reported_length_remaining(tvb, data_offset);
-  while (data_offset < end_offset) {
+  while (data_offset < end_offset - postamble_size) {
     old_offset = data_offset;
     data_offset = dissect_acn_root_pdu(tvb, pinfo, acn_tree, data_offset, &pdu_offsets, 1);
-    if (data_offset == old_offset) break;
+    if (data_offset == old_offset) return tvb_reported_length(tvb);
+  }
+  /* one past the last postamble byte */
+  while (data_offset < end_offset) {
+    proto_tree_add_item(acn_tree, hf_acn_postamble_key_fingerprint, tvb, data_offset, 4, ENC_NA);
+    data_offset += 4;
+    proto_tree_add_item(acn_tree, hf_acn_postamble_seq_type, tvb, data_offset, 1, ENC_NA);
+    data_offset += 1;
+    proto_tree_add_item(acn_tree, hf_acn_postamble_seq_hi, tvb, data_offset, 3, ENC_BIG_ENDIAN);
+    data_offset += 3;
+    proto_tree_add_item(acn_tree, hf_acn_postamble_seq_low, tvb, data_offset, 4, ENC_BIG_ENDIAN);
+    data_offset += 4;
+    proto_tree_add_item(acn_tree, hf_acn_postamble_message_digest, tvb, data_offset, 16, ENC_NA);
+    data_offset += 16;
   }
   return tvb_reported_length(tvb);
 }
@@ -7959,6 +7991,42 @@ proto_register_acn(void)
         FT_GUID, BASE_NONE, NULL, 0x0,
         "Reply DCID", HFILL }
     },
+
+    /* Key Fingerprint */
+    { &hf_acn_postamble_key_fingerprint,
+      { "Key Fingerprint", "acn.security.key_fingerprint",
+        FT_BYTES, BASE_NONE, NULL, 0x0,
+        "Security Key Fingerprint", HFILL }
+    },
+
+    /* Sequence type */
+    { &hf_acn_postamble_seq_type,
+      { "Sequence Type", "acn.security.seq_type",
+        FT_UINT8, BASE_DEC, VALS(security_seq_type_vals), 0x0,
+        "Security Sequence Type", HFILL }
+    },
+
+    /* Sequence High */
+    { &hf_acn_postamble_seq_hi,
+      { "Sequence High", "acn.security.seq_hi",
+        FT_UINT24, BASE_HEX, NULL, 0x0,
+        "Security Sequence High", HFILL }
+    },
+
+    /* Sequence Low */
+    { &hf_acn_postamble_seq_low,
+      { "Sequence Low", "acn.security.seq_low",
+        FT_UINT32, BASE_HEX, NULL, 0x0,
+        "Security Sequence Low", HFILL }
+    },
+
+    /* Message Digest */
+    { &hf_acn_postamble_message_digest,
+      { "Message Digest", "acn.security.digest",
+        FT_BYTES, BASE_NONE, NULL, 0x0,
+        "Security Message Digest", HFILL }
+    },
+
   };
 
   static hf_register_info rdmnet_hf[] = {