diff --git a/.env.sample b/.env.sample
new file mode 100644
index 0000000..78c18d0
--- /dev/null
+++ b/.env.sample
@@ -0,0 +1,2 @@
+java="C:\java8\jre\bin\java.exe"
+closure="C:\closure-compiler\closure-compiler-v20220104.jar"
diff --git a/README.md b/README.md
index 9976d78..ec1b16b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+<div align="center"><img src="logo.png" title="zgapdfsigner"></div>
+
 # ZgaPdfSigner
 A javascript tool to sign a pdf or set protection of a pdf in web browser.  
 And it also can be used in Google Apps Script and nodejs.  
diff --git a/closure.js b/closure.js
new file mode 100644
index 0000000..a30d8ca
--- /dev/null
+++ b/closure.js
@@ -0,0 +1,180 @@
+const m_fs = require("fs");
+const m_path = require("path");
+const m_cp = require("child_process");
+
+/** @const {string} */
+const m_libpath = "lib/";
+/** @const {string} */
+const m_distpath = "dist/_";
+/** @const {Array<string>} */
+const m_targets = ["zgacertsutil.js", "zgapdfcryptor.js", "zgapdfsigner.js", "zgaindex.js"];
+/** @const {Array<string>} */
+const m_dists = [];
+
+/**
+ * @param {string} raw
+ * @return {Uint8Array}
+ */
+function rawToU8arr(raw){
+	/** @type {Uint8Array} */
+	var arr = new Uint8Array(raw.length);
+	for(var i=0; i<raw.length; i++){
+		arr[i] = raw.charCodeAt(i);
+	}
+	return arr;
+}
+/** @const {number} */
+const m_repcode = "*".charCodeAt(0);
+/** @const {Uint8Array} */
+const m_cprbufst = rawToU8arr("//Only for nodejs Start");
+/** @const {number} */
+const m_repidxst = 1;
+/** @const {Uint8Array} */
+const m_cprbufed = rawToU8arr("Only for nodejs End//");
+/** @const {number} */
+const m_repidxed = 19;
+
+/** @type {boolean} */
+var m_debug = false;
+
+/**
+ * @param {Uint8Array} tgtbuf
+ * @param {number} idx
+ * @param {Uint8Array} cprbuf
+ * @return {boolean}
+ */
+function sameBuffer(tgtbuf, idx, cprbuf){
+	for(var i=0; i<cprbuf.length; i++,idx++){
+		if(idx >= tgtbuf.length){
+			return false;
+		}else if(tgtbuf[idx] != cprbuf[i]){
+			return false;
+		}
+	}
+	return true;
+}
+
+/**
+ * @param {string} js
+ */
+function fixjs(js){
+	/** @type {string} */
+	var jspath = m_path.join(__dirname, m_libpath + js);
+	/** @type {Buffer} */
+	var jsbuf = m_fs.readFileSync(jspath);
+	for(var i=0; i<jsbuf.length; i++){
+		if(sameBuffer(jsbuf, i, m_cprbufst)){
+			jsbuf[i + m_repidxst] = m_repcode;
+		}else if(sameBuffer(jsbuf, i, m_cprbufed)){
+			jsbuf[i + m_repidxed] = m_repcode;
+		}
+	}
+
+	jspath = m_distpath + js;
+	m_dists.push(jspath);
+
+	jspath = m_path.join(__dirname, jspath);
+	m_fs.writeFileSync(jspath, jsbuf);
+	if(m_debug){
+		console.log("Output file: " + jspath);
+	}
+}
+/**
+ * @param {string} js
+ */
+function deltmpjs(js){
+	/** @type {string} */
+	var jspath = m_path.join(__dirname, js);
+	m_fs.rmSync(jspath);
+	if(m_debug){
+		console.log("Deleted file: " + jspath);
+	}
+}
+
+/**
+ * @param {envfil}
+ * @return {Object<string, string>}
+ */
+function loadEnv(envfil){
+	/** @type {Object<string, string>} */
+	var retobj = {};
+	/** @type {string} */
+	var envpath = m_path.join(__dirname, envfil);
+	/** @type {Array<string>} */
+	var envs = m_fs.readFileSync(envpath, "utf8").split("\n");
+	envs.forEach(function(/** @type {string} */a_env){
+		a_env = a_env.trimStart();
+		if(a_env.charAt(0) != "#"){
+			var a_idx = a_env.indexOf("=");
+			if(a_idx > 0){
+				retobj[a_env.substring(0, a_idx)] = a_env.substring(a_idx + 1);
+			}
+		}
+	});
+	if(m_debug){
+		console.log("Environment:");
+		console.log(retobj);
+	}
+	return retobj;
+}
+
+function main(){
+	if(process.argv.indexOf("-debug") > 0){
+		m_debug = true;
+	}
+
+	/** @type {Object<string, string>} */
+	var env = loadEnv(".env");
+
+	/** @type {boolean} */
+	var flg = true;
+	if(!env.java){
+		console.error("Can't find java's execution path in .env file.");
+		flg = false;
+	}
+	if(!env.closure){
+		console.error("Can't find closure complier's path in .env file.");
+		flg = false;
+	}
+	if(!flg){
+		return;
+	}
+
+	m_targets.forEach(fixjs);
+
+	/** @type {Array<string>} */
+	var cmd = [env.java];
+	cmd.push("-jar " + env.closure);
+	cmd.push("--charset UTF-8");
+	cmd.push("--compilation_level SIMPLE_OPTIMIZATIONS");
+	cmd.push("--warning_level VERBOSE");
+	cmd.push("--externs closure/google-ext.js");
+	cmd.push("--externs closure/forge-ext.js");
+	cmd.push("--externs closure/pdflib-ext.js");
+	cmd.push("--externs closure/zb-externs.js");
+	m_dists.forEach(function(a_js){
+		cmd.push("--js " + a_js);
+	});
+	cmd.push("--js_output_file dist/zgapdfsigner.min.js");
+	if(m_debug){
+		console.log(cmd.join(" "));
+	}
+
+	console.log("Excuting google closure compiler...\n");
+	m_cp.exec(cmd.join(" "), function(a_err, a_stdout, a_stderr){
+		const a_rex = new RegExp("^" + m_distpath, "g");
+		// if(a_err){
+			// console.log(a_err);
+		// }
+		if(a_stdout){
+			console.log(a_stdout.replaceAll(a_rex, m_libpath));
+		}
+		if(a_stderr){
+			console.log(a_stderr.replaceAll(a_rex, m_libpath));
+		}
+		m_dists.forEach(deltmpjs);
+		console.log("Done");
+	});
+}
+
+main();
diff --git a/closure/zb-externs.js b/closure/zb-externs.js
index 7bd435c..73df217 100644
--- a/closure/zb-externs.js
+++ b/closure/zb-externs.js
@@ -164,6 +164,11 @@ Zga.PdfCryptor = function(encopt){};
  * @return {Promise<PDFLib.PDFDocument>}
  */
 Zga.PdfCryptor.prototype.encryptPdf = function(pdf, ref){};
+/**
+ * @param {number} num
+ * @param {PDFLib.PDFObject} val
+ */
+Zga.PdfCryptor.prototype.encryptObject = function(num, val){};
 /**
  * @constructor
  * @param {Array<forge_cert|forge.asn1|string>=} certs
@@ -198,6 +203,10 @@ Zga.CertsChain.prototype.prepareDSSInf = function(crlOnly){};
  * @param {TsaServiceInfo} inf
  */
 Zga.TsaFetcher = function(inf){};
+/** @type {string} */
+Zga.TsaFetcher.prototype.url;
+/** @type {number} */
+Zga.TsaFetcher.prototype.len;
 /**
  * @param {string=} data
  * @return {Promise<string>}
diff --git a/lib/zgacertsutil.js b/lib/zgacertsutil.js
index 4ad3be1..e392fe4 100644
--- a/lib/zgacertsutil.js
+++ b/lib/zgacertsutil.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * @param {Object<string, *>} z
  */
@@ -877,9 +879,9 @@ z.TsaFetcher = class{
 		this.asnc = forge.asn1.Class;
 		/** @private @lends {forge.asn1.Type} */
 		this.asnt = forge.asn1.Type;
-		/** @private @type {string} */
+		/** @public @type {string} */
 		this.url = inf.url;
-		/** @private @type {number} */
+		/** @public @type {number} */
 		this.len = inf.len ? inf.len : 0;
 		/** @private @type {Object<string, *>|undefined} */
 		this.headers = inf.headers;
diff --git a/lib/zgaindex.js b/lib/zgaindex.js
index 7934726..04703df 100644
--- a/lib/zgaindex.js
+++ b/lib/zgaindex.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * @return {Object<string, *>}
  */
@@ -59,11 +61,17 @@ function genZga(){
 	return z;
 }
 
+//Only for nodejs Start//
 if(typeof exports === "object" && typeof module !== "undefined"){
 	module.exports = genZga();
-}else if(!globalThis.Zga){
-	globalThis.Zga = genZga();
-	supplyZgaCertsChain(globalThis.Zga);
-	supplyZgaCryptor(globalThis.Zga);
-	supplyZgaSigner(globalThis.Zga);
+}else{
+//Only for nodejs End//
+	if(!globalThis.Zga){
+		globalThis.Zga = genZga();
+		supplyZgaCertsChain(globalThis.Zga);
+		supplyZgaCryptor(globalThis.Zga);
+		supplyZgaSigner(globalThis.Zga);
+	}
+//Only for nodejs Start//
 }
+//Only for nodejs End//
diff --git a/lib/zgapdfcryptor.js b/lib/zgapdfcryptor.js
index cb66f32..8ddf9b5 100644
--- a/lib/zgapdfcryptor.js
+++ b/lib/zgapdfcryptor.js
@@ -1,3 +1,5 @@
+'use strict';
+
 // This module was migrated from [TCPDF](http://www.tcpdf.org)
 /**
  * @param {Object<string, *>} z
@@ -428,6 +430,8 @@ z.PdfCryptor = class{
 	 * @return {Promise<PDFLib.PDFDocument>}
 	 */
 	async encryptPdf(pdf, ref){
+		/** @const {z.PdfCryptor} */
+		const _this = this;
 		/** @type {PDFLib.PDFDocument} */
 		var pdfdoc = await z.loadPdf(pdf);
 		if(pdfdoc === pdf && !ref){
@@ -437,45 +441,10 @@ z.PdfCryptor = class{
 		/** @type {PDFLib.PDFContext} */
 		var pdfcont = pdfdoc.context;
 		/** @type {PDFLib.PDFObject} */
-		var trobj = this.prepareEncrypt(pdfcont);
+		var trobj = _this.prepareEncrypt(pdfcont);
 
-		/**
-		 * @param {number} a_num
-		 * @param {PDFLib.PDFObject} a_val
-		 */
-		var func = function(a_num, a_val){
-			if(a_val instanceof PDFLib.PDFContentStream){
-				/** @type {Uint8Array} */
-				var a_dat = a_val.contentsCache.access();
-				if(a_dat){
-					a_val.contentsCache.value = this.encryptU8arr(a_num, a_dat);
-				}
-			}else if(a_val instanceof PDFLib.PDFStream){
-				if(a_val.contents){
-					a_val.contents = this.encryptU8arr(a_num, a_val.contents);
-				}
-			}else if(a_val instanceof PDFLib.PDFHexString){
-				if(a_val.value){
-					a_val.value = this.encryptHexstr(a_num, a_val.value);
-				}
-			}else if(a_val instanceof PDFLib.PDFString){
-				if(a_val.value){
-					a_val.value = z.Crypto._escape(this._encrypt_data(a_num, a_val.value));
-				}
-			}
-			if(a_val.dict instanceof Map){
-				/** @type {Iterator} */
-				var a_es = a_val.dict.entries();
-				/** @type {IIterableResult<PdfObjEntry>} */
-				var a_res = a_es.next();
-				while(!a_res.done){
-					func(a_num, a_res.value[1]);
-					a_res = a_es.next();
-				}
-			}
-		}.bind(this);
 		pdfcont.enumerateIndirectObjects().forEach(function(/** @type {PdfObjEntry} */a_arr){
-			func(a_arr[0].objectNumber, a_arr[1]);
+			_this.encryptObject(a_arr[0].objectNumber, a_arr[1]);
 		});
 
 		if(ref){
@@ -488,6 +457,43 @@ z.PdfCryptor = class{
 		return pdfdoc;
 	}
 
+	/**
+	 * @public
+	 * @param {number} num
+	 * @param {PDFLib.PDFObject} val
+	 */
+	encryptObject(num, val){
+		if(val instanceof PDFLib.PDFContentStream){
+			/** @type {Uint8Array} */
+			var dat = val.contentsCache.access();
+			if(dat){
+				val.contentsCache.value = this.encryptU8arr(num, dat);
+			}
+		}else if(val instanceof PDFLib.PDFStream){
+			if(val.contents){
+				val.contents = this.encryptU8arr(num, val.contents);
+			}
+		}else if(val instanceof PDFLib.PDFHexString){
+			if(val.value){
+				val.value = this.encryptHexstr(num, val.value);
+			}
+		}else if(val instanceof PDFLib.PDFString){
+			if(val.value){
+				val.value = z.Crypto._escape(this._encrypt_data(num, val.value));
+			}
+		}
+		if(val.dict instanceof Map){
+			/** @type {Iterator} */
+			var es = val.dict.entries();
+			/** @type {IIterableResult<PdfObjEntry>} */
+			var res = es.next();
+			while(!res.done){
+				this.encryptObject(num, res.value[1]);
+				res = es.next();
+			}
+		}
+	}
+
 	/**
 	 * Prepare for encryption and create the object for saving in trailer.
 	 *
@@ -955,6 +961,8 @@ z.PdfCryptor = class{
 
 }
 
+//Only for nodejs Start//
 if(typeof exports === "object" && typeof module !== "undefined"){
 	module.exports = supplyZgaCryptor;
 }
+//Only for nodejs End//
diff --git a/lib/zgapdfsigner.js b/lib/zgapdfsigner.js
index bee9cdb..d88b464 100644
--- a/lib/zgapdfsigner.js
+++ b/lib/zgapdfsigner.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * @param {Object<string, *>} z
  */
@@ -215,6 +217,8 @@ z.PdfSigner = class{
 	constructor(signopt){
 		/** @public @type {Zga.TsaFetcher} */
 		this.tsaFetcher = null;
+		/** @public @type {Zga.PdfCryptor} */
+		this.cyptr = null;
 
 		/** @private @const {string} */
 		this.DEFAULT_BYTE_RANGE_PLACEHOLDER = "**********";
@@ -226,8 +230,6 @@ z.PdfSigner = class{
 		this.privateKey = null;
 		/** @type {Zga.CertsChain} */
 		this.cchain = null;
-		/** @private @type {?TsaServiceInfo} */
-		this.tsainf = null;
 		/** @private @type {string} */
 		this.signature = "";
 		/** @private @type {number} */
@@ -250,35 +252,38 @@ z.PdfSigner = class{
 		if(!(globalThis.forge || forge)){
 			throw new Error("node-forge is not imported.");
 		}
+		/** @type {?TsaServiceInfo} */
+		var tsainf = null;
 		if(signopt.signdate){
 			if(typeof signopt.signdate == "string"){
-				this.tsainf = {
+				tsainf = {
 					url: signopt.signdate,
 				};
 			}else if(signopt.signdate.url){
-				this.tsainf = /** @type {TsaServiceInfo} */(Object.assign({}, signopt.signdate));
+				tsainf = /** @type {TsaServiceInfo} */(Object.assign({}, signopt.signdate));
 			}
 		}
-		if(this.tsainf){
+		if(tsainf){
 			if(!z.urlFetch){
 				throw new Error("Because of the CORS security restrictions, signing with TSA is not supported in web browser.");
 			}
-			if(z.TSAURLS[this.tsainf.url]){
-				Object.assign(this.tsainf, z.TSAURLS[this.tsainf.url]);
-			}else if(!(new RegExp("^https?://")).test(this.tsainf.url)){
-				throw new Error("Unknown tsa data. " + JSON.stringify(this.tsainf));
+			if(z.TSAURLS[tsainf.url]){
+				Object.assign(tsainf, z.TSAURLS[tsainf.url]);
+			}else if(!(new RegExp("^https?://")).test(tsainf.url)){
+				throw new Error("Unknown tsa data. " + JSON.stringify(tsainf));
 			}
-			if(!this.tsainf.len){
-				this.tsainf.len = 16000;
+			if(!tsainf.len){
+				tsainf.len = 16000;
 			}
+			this.tsaFetcher = new z.TsaFetcher(/** @type {TsaServiceInfo} */(tsainf));
 		}
 		if(signopt.ltv && !z.urlFetch){
 			throw new Error("Because of the CORS security restrictions, signing with LTV is not supported in web browser.");
 		}
-		if(signopt.permission == 1 && signopt.ltv){
-			z.log("To enable LTV we need to append informations after signing, this will destroy the signature if full DocMDP protection is set. (Sign with permission = 1)");
-			throw new Error("When set full DocMDP protection, LTV can't be enabled.");
-		}
+		// if(signopt.permission == 1 && signopt.ltv){
+			// z.log("To enable LTV we need to append informations after signing, this will destroy the signature if full DocMDP protection is set. (Sign with permission = 1)");
+			// throw new Error("When set full DocMDP protection, LTV can't be enabled.");
+		// }
 	}
 
 	/**
@@ -302,7 +307,7 @@ z.PdfSigner = class{
 			if(Array.isArray(pdf)){
 				_this.oriU8pdf = new Uint8Array(pdf);
 			}else{
-				_this.oriU8pdf = PDFLib.toUint8Array(/** @type {(ArrayBuffer|Uint8Array|string)} */(pdf));
+				_this.oriU8pdf = PDFLib.toUint8Array(/** @type {ArrayBuffer|Uint8Array|string} */(pdf));
 			}
 			pdfdoc = await PDFLib.PDFDocument.load(_this.oriU8pdf);
 		}
@@ -338,7 +343,7 @@ z.PdfSigner = class{
 				}
 			}
 			z.fixCertAttributes(cert);
-		}else if(_this.tsainf){
+		}else if(_this.tsaFetcher){
 			z.log("No certificate is specified, so only add a document timestamp.")
 		}else{
 			throw new Error("Nothing to do because no certificate nor tsa is specified.");
@@ -346,9 +351,24 @@ z.PdfSigner = class{
 
 		/** @type {boolean} *///append mode or not
 		var apmode = _this.addSignHolder(pdfdoc);
-		await pdfdoc.flush();
 		z.log("A signature holder has been added to the pdf.");
 
+		if(_this.opt.permission == 1 && (_this.opt.ltv == 1 || _this.opt.ltv == 2)){
+			if(!_this.cchain){
+				// Query a timestamp from tsa with dummy string to obtain the certificates.
+				await _this.queryTsa("dummy");
+			}
+			/** @type {PDFLib.PDFDocument} */
+			var dmydoc = await _this.addDss(pdfdoc);
+			if(dmydoc){
+				z.log("In order to enable LTV, DSS informations has been added to the pdf.");
+			}
+			// Clear ltv
+			_this.opt.ltv = 0;
+		}else{
+			await pdfdoc.flush();
+		}
+
 		if(apmode){
 			if(_this.oriU8pdf){
 				z.log("The pdf has been signed already, so we add a new signature to it.");
@@ -381,8 +401,8 @@ z.PdfSigner = class{
 					}
 				}
 				/** @type {Zga.PdfCryptor} */
-				var cypt = new z.PdfCryptor(cypopt);
-				await cypt.encryptPdf(pdfdoc, encref);
+				_this.cyptr = new z.PdfCryptor(cypopt);
+				await _this.cyptr.encryptPdf(pdfdoc, encref);
 				z.log("Pdf data has been encrypted.");
 			}
 		}
@@ -408,22 +428,11 @@ z.PdfSigner = class{
 			throw new Error("Failed to sign the pdf.");
 		}
 
-		if(_this.opt.ltv == 1 || _this.opt.ltv == 2){
-			cchain = _this.cchain ? _this.cchain : _this.tsaFetcher.getCertsChain();
-			if(cchain.isSelfSignedCert()){
-				z.log("No need to enable LTV because the certificate is a self signed one.");
-			}else{
-				/** @type {boolean} */
-				var crlOnly = (_this.opt.ltv == 2);
-				_this.oriU8pdf = ret;
-				pdfdoc = await PDFLib.PDFDocument.load(_this.oriU8pdf, {ignoreEncryption: true});
-				ret = await _this.applyLTV(pdfdoc, cchain, crlOnly);
-				if(ret){
-					z.log("LTV has been enabled.");
-				}else{
-					throw new Error("Failed to enable the LTV.");
-				}
-			}
+		pdfdoc = await _this.addDss(ret);
+		if(pdfdoc){
+			await _this.findChangedObjects(pdfdoc, true);
+			ret = _this.appendIncrement(pdfdoc);
+			z.log("LTV has been enabled.");
 		}
 
 		return ret;
@@ -465,6 +474,9 @@ z.PdfSigner = class{
 				/** @type {PDFLib.PDFObject} */
 				var a_obj = oriPdfdoc.context.lookup(a_ele[0]);
 				if(!(a_obj && _this.isamePdfObject(a_ele[1], a_obj))){
+					if(_this.cyptr){
+						_this.cyptr.encryptObject(a_ele[0].objectNumber, a_ele[1]);
+					}
 					_this.apobjs.push(a_ele);
 				}
 			}
@@ -720,7 +732,7 @@ z.PdfSigner = class{
 
 		/** @type {Date} */
 		var signdate = new Date();
-		if(_this.opt.signdate instanceof Date && !_this.tsainf){
+		if(_this.opt.signdate instanceof Date && !_this.tsaFetcher){
 			signdate = _this.opt.signdate;
 		}
 
@@ -731,7 +743,7 @@ z.PdfSigner = class{
 		bytrng.push(PDFLib.PDFName.of(_this.DEFAULT_BYTE_RANGE_PLACEHOLDER));
 		bytrng.push(PDFLib.PDFName.of(_this.DEFAULT_BYTE_RANGE_PLACEHOLDER));
 
-		_this.siglen = /** @type {number} */(_this.tsainf ? _this.tsainf.len : 3322);
+		_this.siglen = /** @type {number} */(_this.tsaFetcher ? _this.tsaFetcher.len : 3322);
 		_this.sigContents = PDFLib.PDFHexString.of("0".repeat(_this.siglen));
 
 		/** @type {Object<string, *>} */
@@ -803,7 +815,11 @@ z.PdfSigner = class{
 		var ans = page.node.Annots();
 		if(!ans){
 			ans = new PDFLib.PDFArray(pdfcont);
-			page.node.set(PDFLib.PDFName.Annots, pdfcont.register(ans));
+			// if(docMdp){
+				page.node.set(PDFLib.PDFName.Annots, ans);
+			// }else{
+				// page.node.set(PDFLib.PDFName.Annots, pdfcont.register(ans));
+			// }
 		}
 		ans.push(widgetDictRef);
 
@@ -922,7 +938,7 @@ z.PdfSigner = class{
 		if(_this.cchain){
 			/** @type {Date} */
 			var signdate = new Date();
-			if(_this.opt.signdate instanceof Date && !_this.tsainf){
+			if(_this.opt.signdate instanceof Date && !_this.tsaFetcher){
 				signdate = _this.opt.signdate;
 			}
 
@@ -959,7 +975,7 @@ z.PdfSigner = class{
 			// Sign in detached mode.
 			p7.sign({"detached": true});
 
-			if(_this.tsainf){
+			if(_this.tsaFetcher){
 				/** @type {forge.asn1} */
 				var tsatoken = await _this.queryTsa(p7.signers[0].signature, true);
 				p7.signerInfos[0].value.push(tsatoken);
@@ -1001,7 +1017,6 @@ z.PdfSigner = class{
 	async queryTsa(data, forP7){
 		/** @const {z.PdfSigner} */
 		const _this = this;
-		_this.tsaFetcher = new z.TsaFetcher(/** @type {TsaServiceInfo} */(_this.tsainf));
 		/** @type {?string} */
 		var err = await _this.tsaFetcher.queryTsa(data);
 		if(err){
@@ -1009,42 +1024,44 @@ z.PdfSigner = class{
 		}else{
 			/** @type {forge.asn1} */
 			var asn1 = _this.tsaFetcher.getToken(forP7);
-			z.log("Timestamp from " + _this.tsainf.url + " has been obtained.");
+			z.log("Timestamp from " + _this.tsaFetcher.url + " has been obtained.");
 			return asn1;
 		}
 	}
 
 	/**
-	 * @public
-	 * @param {PDFLib.PDFDocument} pdfdoc
-	 * @param {Zga.CertsChain} chain
-	 * @param {boolean=} crlOnly
-	 * @return {Promise<Uint8Array>}
+	 * @private
+	 * @param {PDFLib.PDFDocument|Uint8Array} pdf
+	 * @return {Promise<PDFLib.PDFDocument>}
 	 */
-	async applyLTV(pdfdoc, chain, crlOnly){
+	async addDss(pdf){
 		/** @const {z.PdfSigner} */
 		const _this = this;
+		if(_this.opt.ltv != 1 && _this.opt.ltv != 2){
+			return null;
+		}
+		/** @type {Zga.CertsChain} */
+		var cchain = _this.cchain ? _this.cchain : _this.tsaFetcher.getCertsChain();
+		if(cchain.isSelfSignedCert()){
+			z.log("No need to enable LTV because the certificate is a self signed one.");
+			return null;
+		}
+		/** @type {boolean} */
+		var crlOnly = (_this.opt.ltv == 2);
 		/** @type {?DSSInfo} */
-		var dssinf = await chain.prepareDSSInf(crlOnly);
+		var dssinf = await cchain.prepareDSSInf(crlOnly);
 		if(!dssinf){
 			return null;
 		}
-		if(!_this.addDss(pdfdoc, _this.signature, dssinf)){
-			return null;
-		}
-		await pdfdoc.flush();
-		await _this.findChangedObjects(pdfdoc, true);
-		return _this.appendIncrement(pdfdoc);
-	}
 
-	/**
-	 * @private
-	 * @param {PDFLib.PDFDocument} pdfdoc
-	 * @param {string} sig signature
-	 * @param {DSSInfo=} dssinf
-	 * @return {boolean}
-	 */
-	addDss(pdfdoc, sig, dssinf){
+		/** @type {PDFLib.PDFDocument} */
+		var pdfdoc = null;
+		if(pdf.addPage){
+			pdfdoc = /** @type {PDFLib.PDFDocument} */(pdf);
+		}else{
+			_this.oriU8pdf = /** @type {Uint8Array} */(pdf);
+			pdfdoc = await PDFLib.PDFDocument.load(_this.oriU8pdf, {ignoreEncryption: true});
+		}
 		/** @type {PDFLib.PDFContext} */
 		var pdfcont = pdfdoc.context;
 		/** @type {Array<PDFLib.PDFRef>} */
@@ -1073,7 +1090,7 @@ z.PdfSigner = class{
 
 		if(!(ocspRefs || crlRefs)){
 			// Nothing to do.
-			return false;
+			return null;
 		}
 
 		if(dssinf && dssinf.certs && dssinf.certs.length > 0){
@@ -1087,11 +1104,14 @@ z.PdfSigner = class{
 			});
 		}
 
-		/** @type {forge.md.digest} */
-		var md = forge.md.sha1.create();
-		md.update(sig);
 		/** @type {string} */
-		var sighex = md.digest().toHex().toUpperCase();
+		var sighex = "";
+		if(_this.signature){
+			/** @type {forge.md.digest} */
+			var md = forge.md.sha1.create();
+			md.update(_this.signature);
+			sighex = md.digest().toHex().toUpperCase();
+		}
 
 		var dss = /** @type {PDFLib.PDFDict} */(pdfdoc.catalog.lookupMaybe(PDFLib.PDFName.of("DSS"), PDFLib.PDFDict));
 		/** @type {PDFLib.PDFArray} */
@@ -1103,9 +1123,12 @@ z.PdfSigner = class{
 		/** @type {PDFLib.PDFDict} */
 		var vri = null;
 		/** @type {Object<string, *>} */
-		var vriObj = {
-			TU: PDFLib.PDFString.fromDate(new Date()),
-		};
+		var vriObj = null;
+		if(sighex){
+			vriObj = {
+				TU: PDFLib.PDFString.fromDate(new Date()),
+			};
+		}
 		/** @type {PDFLib.PDFArray} */
 		var sigcertsarr = null;
 		/** @type {PDFLib.PDFArray} */
@@ -1122,47 +1145,63 @@ z.PdfSigner = class{
 			pdfdoc.catalog.set(PDFLib.PDFName.of("DSS"), pdfcont.register(dss));
 		}
 		if(certRefs){
-			sigcertsarr = new PDFLib.PDFArray(pdfcont);
-			vriObj["Cert"] = sigcertsarr;
+			if(vriObj){
+				sigcertsarr = new PDFLib.PDFArray(pdfcont);
+				vriObj["Cert"] = sigcertsarr;
+			}
 			if(!certsarr){
 				certsarr = new PDFLib.PDFArray(pdfcont);
 				dss.set(PDFLib.PDFName.of("Certs"), pdfcont.register(certsarr));
 			}
 			certRefs.forEach(function(/** @type {PDFLib.PDFRef} */a_ref){
-				sigcertsarr.push(a_ref);
+				if(sigcertsarr){
+					sigcertsarr.push(a_ref);
+				}
 				certsarr.push(a_ref);
 			});
 		}
 		if(ocspRefs){
-			sigocpsarr = new PDFLib.PDFArray(pdfcont);
-			vriObj["OCSP"] = sigocpsarr;
+			if(vriObj){
+				sigocpsarr = new PDFLib.PDFArray(pdfcont);
+				vriObj["OCSP"] = sigocpsarr;
+			}
 			if(!ocpsarr){
 				ocpsarr = new PDFLib.PDFArray(pdfcont);
 				dss.set(PDFLib.PDFName.of("OCSPs"), pdfcont.register(ocpsarr));
 			}
 			ocspRefs.forEach(function(/** @type {PDFLib.PDFRef} */a_ref){
-				sigocpsarr.push(a_ref);
+				if(sigocpsarr){
+					sigocpsarr.push(a_ref);
+				}
 				ocpsarr.push(a_ref);
 			});
 		}
 		if(crlRefs){
-			sigcrlsarr = new PDFLib.PDFArray(pdfcont);
-			vriObj["CRL"] = sigcrlsarr;
+			if(vriObj){
+				sigcrlsarr = new PDFLib.PDFArray(pdfcont);
+				vriObj["CRL"] = sigcrlsarr;
+			}
 			if(!crlsarr){
 				crlsarr = new PDFLib.PDFArray(pdfcont);
 				dss.set(PDFLib.PDFName.of("CRLs"), pdfcont.register(crlsarr));
 			}
 			crlRefs.forEach(function(/** @type {PDFLib.PDFRef} */a_ref){
-				sigcrlsarr.push(a_ref);
+				if(sigcrlsarr){
+					sigcrlsarr.push(a_ref);
+				}
 				crlsarr.push(a_ref);
 			});
 		}
-		if(!vri){
-			vri = /** @type {PDFLib.PDFDict} */(pdfcont.obj({}));
-			dss.set(PDFLib.PDFName.of("VRI"), pdfcont.register(vri));
+		if(sighex && vriObj){
+			if(!vri){
+				vri = /** @type {PDFLib.PDFDict} */(pdfcont.obj({}));
+				dss.set(PDFLib.PDFName.of("VRI"), pdfcont.register(vri));
+			}
+			vri.set(PDFLib.PDFName.of(sighex), pdfcont.register(pdfcont.obj(vriObj)));
 		}
-		vri.set(PDFLib.PDFName.of(sighex), pdfcont.register(pdfcont.obj(vriObj)));
-		return true;
+		await pdfdoc.flush();
+
+		return pdfdoc;
 	}
 };
 
diff --git a/logo.png b/logo.png
new file mode 100644
index 0000000..8c1f296
Binary files /dev/null and b/logo.png differ
diff --git a/package.json b/package.json
index 116f098..a610319 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "zgapdfsigner",
   "version": "2.3.0",
+  "author": "zboris12",
   "description": "A javascript tool to sign a pdf or set protection to a pdf in web browser, Google Apps Script and nodejs.",
   "homepage": "https://github.com/zboris12/zgapdfsigner",
   "private": false,
@@ -26,7 +27,8 @@
     "TSA"
   ],
   "scripts": {
-    "testsign": "node test4node.js"
+    "build": "node closure.js",
+    "test": "node test4node.js"
   },
   "dependencies": {
     "pdf-lib": "1.17.1",
diff --git a/test4node.js b/test4node.js
index 3e7b5d3..a5ba99c 100644
--- a/test4node.js
+++ b/test4node.js
@@ -4,6 +4,111 @@ const Zga = require("./lib/zganode.js");
 
 const workpath = "test/";
 
+/**
+ * @param {string} pdfPath
+ * @param {string} pfxPath
+ * @param {string} ps
+ * @param {number} perm
+ * @param {string=} imgPath
+ * @return {Promise<string>} output path
+ */
+async function sign_protect(pdfPath, pfxPath, ps, perm, imgPath){
+	/** @type {Buffer} */
+	var pdf = m_fs.readFileSync(pdfPath);
+	/** @type {Buffer} */
+	var pfx = m_fs.readFileSync(pfxPath);
+	/** @type {Buffer} */
+	var img = null;
+	/** @type {string} */
+	var imgType = "";
+
+	if(perm == 1){
+		console.log("\nTest signing pdf with full protection. (permission 1 and password encryption)");
+	}else{
+		console.log("\nTest signing pdf with permission "+perm);
+	}
+
+	if(imgPath){
+		img = m_fs.readFileSync(imgPath);
+		imgType = m_path.extname(imgPath).slice(1);
+	}
+	/** @type {SignOption} */
+	var sopt = {
+		p12cert: pfx,
+		pwd: ps,
+		permission: perm,
+		signdate: "1",
+		reason: "I have a test reason "+perm+".",
+		location: "I am on the earth "+perm+".",
+		contact: "zga"+perm+"@zga.com",
+		ltv: 1,
+		debug: true,
+	};
+	if(img){
+		sopt.drawinf = {
+			area: {
+				x: 25, // left
+				y: 150, // top
+				w: 60,
+				h: 60,
+			},
+			imgData: img,
+			imgType: imgType,
+		};
+	}
+
+	/** @type {EncryptOption} */
+	var eopt = undefined;
+	if(perm == 1){
+		eopt = {
+			mode: Zga.Crypto.Mode.AES_256,
+			permissions: ["copy", "copy-extract", "print-high"],
+			userpwd: "123",
+		};
+	}
+
+	/** @type {Zga.PdfSigner} */
+	var ser = new Zga.PdfSigner(sopt);
+	/** @type {Uint8Array} */
+	var u8dat = await ser.sign(pdf, eopt);
+	if(u8dat){
+		/** @type {string} */
+		var outPath = m_path.join(__dirname, workpath+"test_perm"+perm+".pdf");
+		m_fs.writeFileSync(outPath, u8dat);
+		console.log("Output file: " + outPath);
+	}
+	return outPath;
+}
+
+/**
+ * @param {string} pdfPath
+ * @return {Promise<string>} output path
+ */
+async function addtsa(pdfPath){
+	console.log("\nTest signing pdf by a timestamp.");
+
+	/** @type {Buffer} */
+	var pdf = m_fs.readFileSync(pdfPath);
+	/** @type {SignOption} */
+	var sopt = {
+		signdate: "2",
+		reason: "I have a test reason tsa.",
+		location: "I am on the earth tsa.",
+		contact: "zgatsa@zga.com",
+		ltv: 1,
+		debug: true,
+	};
+	/** @type {Zga.PdfSigner} */
+	var ser = new Zga.PdfSigner(sopt);
+	/** @type {Uint8Array} */
+	var u8dat = await ser.sign(pdf);
+	/** @type {string} */
+	var outPath = m_path.join(__dirname, workpath+"test_tsa.pdf");
+	m_fs.writeFileSync(outPath, u8dat);
+	console.log("Output file: " + outPath);
+	return outPath;
+}
+
 async function main(){
 	/** @type {string} */
 	var pdfPath = m_path.join(__dirname, workpath+"_test.pdf");
@@ -26,101 +131,15 @@ async function main(){
 		pfxPath = "";
 	}
 
-	/** @type {Buffer} */
-	var pdf = m_fs.readFileSync(pdfPath);
-	/** @type {Buffer} */
-	var pfx = null;
 	if(pfxPath){
-		pfx = m_fs.readFileSync(pfxPath);
-	}
-	/** @type {Buffer} */
-	var img = null;
-	/** @type {string} */
-	var imgType = "";
-	if(imgPath){
-		img = m_fs.readFileSync(imgPath);
-		imgType = m_path.extname(imgPath).slice(1);
+		await sign_protect(pdfPath, pfxPath, ps, 1, imgPath);
+		pdfPath = await sign_protect(pdfPath, pfxPath, ps, 2, imgPath);
+		await addtsa(pdfPath);
+	}else{
+		await addtsa(pdfPath);
 	}
 
-	/** @type {SignOption} */
-	var sopt = null;
-	if(pdf){
-		sopt = {
-			p12cert: pfx,
-			pwd: ps,
-			// permission: pfx ? 2 : 0,
-			signdate: "1",
-			reason: "I have a test reason.",
-			location: "I am on the earth.",
-			contact: "zga@zga.com",
-			ltv: 1,
-			debug: true,
-		};
-		if(img){
-			sopt.drawinf = {
-				area: {
-					x: 25, // left
-					y: 150, // top
-					w: 60,
-					h: 60,
-				},
-//				pageidx: 2,
-				imgData: img,
-				imgType: imgType,
-			};
-		}
-	}
-
-	/** @type {EncryptOption} */
-	var eopt = undefined;
-	eopt = {
-		mode: Zga.Crypto.Mode.AES_256,
-		permissions: ["copy", "copy-extract", "print-high"],
-		userpwd: "123",
-	};
-	// eopt.pubkeys = [];
-
-	/** @type {Uint8Array} */
-	var u8dat = null;
-	if(sopt){
-		/** @type {Zga.PdfSigner} */
-		var ser = new Zga.PdfSigner(sopt);
-		u8dat = await ser.sign(pdf, eopt);
-	}
-
-	if(u8dat){
-		/** @type {string} */
-		var outPath = m_path.join(__dirname, workpath+"test_signed.pdf");
-		m_fs.writeFileSync(outPath, u8dat);
-		console.log("Output file: " + outPath);
-	}
 	console.log("Done");
 }
 
-async function main2(){
-	/** @type {string} */
-	var pdfPath = m_path.join(__dirname, workpath+"test_signed.pdf");
-	/** @type {Buffer} */
-	var pdf = m_fs.readFileSync(pdfPath);
-	/** @type {SignOption} */
-	var sopt = {
-		signdate: "2",
-		reason: "I have a test reason.",
-		location: "I am on the earth.",
-		contact: "zga@zga.com",
-		ltv: 1,
-		debug: true,
-	};
-	/** @type {Zga.PdfSigner} */
-	var ser = new Zga.PdfSigner(sopt);
-	/** @type {Uint8Array} */
-	var u8dat = await ser.sign(pdf);
-	/** @type {string} */
-	var outPath = m_path.join(__dirname, workpath+"test_signed_tsa.pdf");
-	m_fs.writeFileSync(outPath, u8dat);
-	console.log("Output file: " + outPath);
-	return;
-}
-
 main();
-// main2();