diff --git a/src/CopyrighFixer/CopyrighFixer/owner.cpp b/src/CopyrighFixer/CopyrighFixer/owner.cpp
index dd8a233..208b49d 100644
--- a/src/CopyrighFixer/CopyrighFixer/owner.cpp
+++ b/src/CopyrighFixer/CopyrighFixer/owner.cpp
@@ -28,4 +28,30 @@ const int &Owner::getTimePoint() const {
     return _timePoint;
 }
 
+void Owner::fromjson(const QJsonObject &objJs) {
+    if (objJs.contains("name") && objJs.value("name").isString()) {
+         _name = objJs.value("name").toString();
+    }
+
+    if (objJs.contains("timePoint")) {
+        _timePoint = objJs.value("timePoint").toInt();
+    }
+}
+
+const QJsonObject &Owner::toJson(QJsonObject &objJs) const {
+
+    objJs["name"] = _name;
+    objJs["timePoint"] = _timePoint;
+
+    return objJs;
+}
+
+bool Owner::isValid() const {
+    if (_name.size() != 0 && _timePoint > 0) {
+        return true;
+    }
+
+    return false;
+}
+
 };
diff --git a/src/CopyrighFixer/CopyrighFixer/owner.h b/src/CopyrighFixer/CopyrighFixer/owner.h
index 8f8a3f1..14f6fa8 100644
--- a/src/CopyrighFixer/CopyrighFixer/owner.h
+++ b/src/CopyrighFixer/CopyrighFixer/owner.h
@@ -10,6 +10,7 @@
 
 #include "CopyrighFixer_global.h"
 #include <QString>
+#include <QJsonObject>
 
 namespace CopyrighFixer{
 
@@ -36,17 +37,36 @@ public:
      * @brief setTimeRange A method that allows you to set the time interval for using a file.
      * @param interval This is a string value indicating the  date of ownership of the file.
      */
-    void setTimePoint(const QString &interval);
+    void setTimePoint(const int &interval);
 
     /**
      * @brief getTimeRange The method changes the timestamp of the usage.
      * @return the time interval when the file was modified
      */
-    const QString& getTimePoint() const;
+    const int& getTimePoint() const;
+
+    /**
+     * @brief fromjson Reads data from json file.
+     * @param objJs It's object json that contains information about the owner.
+     */
+    void fromjson(const QJsonObject &objJs);
+
+    /**
+     * @brief toJson This method that converts object Owner to json object.
+     * @param objJs It's object json - container.
+     * @return Returns a json object with owner a information.
+     */
+    const QJsonObject &toJson(QJsonObject &objJs) const;
+
+    /**
+     * @brief isValid Checks if an object is initialized.
+     * @return Returns true if object is initialized.
+     */
+    bool isValid() const;
 
 private:
-    QString _name;
-    int _timePoint;
+    QString _name = "";
+    int _timePoint = 1;
 
 };
 
diff --git a/src/CopyrighFixer/CopyrighFixer/sign.cpp b/src/CopyrighFixer/CopyrighFixer/sign.cpp
index cbddd22..9664e77 100644
--- a/src/CopyrighFixer/CopyrighFixer/sign.cpp
+++ b/src/CopyrighFixer/CopyrighFixer/sign.cpp
@@ -12,7 +12,6 @@
 #include <QFileInfo>
 #include <QJsonArray>
 #include <QJsonValue>
-#include <QJsonObject>
 #include <QByteArray>
 #include <QJsonDocument>
 
@@ -57,8 +56,7 @@ bool Signature::fromJson(const QString &pathToFile) {
             return false;
         }
 
-        QByteArray byteSignFile;
-        byteSignFile = file.readAll();
+        QByteArray byteSignFile(file.readAll());
         file.close();
 
         QJsonDocument jsDoc(QJsonDocument::fromJson(byteSignFile));
@@ -77,18 +75,18 @@ bool Signature::fromJson(const QString &pathToFile) {
             return false;
         }
 
-        _licenseTitle = jsObj["license"].toString();
-        _customMessage = jsObj["licenseText"].toString();
-
-        Owner OwnObj;
-        QMap<int, Owner> ownMap;
-
-//        _ownersMap = jsObj["ownersList"]
-
-
+        Owner ownObj;
+        QJsonArray ownLst(jsObj.value("ownersList").toArray());
+        for (auto itemLst = ownLst.cbegin(); itemLst != ownLst.end(); ++itemLst) {
+            ownObj.fromjson(itemLst->toObject());
+            _ownersMap.insert(itemLst->toObject().value("timePoint").toInt(), ownObj);
+        }
 
+        _licenseTitle = jsObj.value("license").toString();
+        _customMessage = jsObj.value("licenseText").toString();
 
         return true;
+
     } else {
         return false;
     }
@@ -97,9 +95,14 @@ bool Signature::fromJson(const QString &pathToFile) {
 
 bool Signature::toJson(QString &pathToFile) const {
 
+    QFileInfo checkFile(pathToFile);
+    if (checkFile.exists() && checkFile.isFile()) {
+        QFile::remove(pathToFile);
+    }
+
+
     QJsonArray lstObjown;
     QJsonObject objOwner;
-
     for (auto obj = _ownersMap.cbegin(); obj != _ownersMap.end(); ++obj) {
         objOwner["timePoint"] = obj.value().getTimePoint();
         objOwner["name"] = obj.value().getOwnerName();
@@ -124,7 +127,19 @@ bool Signature::toJson(QString &pathToFile) const {
     saveFile.write(jsonDoc);
     saveFile.close();
 
-    return 1;
+    return true;
+}
+
+bool Signature::isValid() const {
+    if (_licenseTitle.size() != 0 || _customMessage != 0) {
+        return true;
+    }
+
+    if (_ownersMap.cbegin().key() > 0 && _ownersMap.cbegin().value().isValid()) {
+        return true;
+    }
+
+    return false;
 }
 
 }
diff --git a/src/CopyrighFixer/CopyrighFixer/sign.h b/src/CopyrighFixer/CopyrighFixer/sign.h
index 9c429ca..92ef0a2 100644
--- a/src/CopyrighFixer/CopyrighFixer/sign.h
+++ b/src/CopyrighFixer/CopyrighFixer/sign.h
@@ -70,10 +70,17 @@ public:
      */
     bool toJson(QString &pathToFile) const;
 
+    /**
+     * @brief isValid Checks if an object is initialized.
+     * @return Returns true if object is initialized.
+     */
+    bool isValid() const;
+
 private:
     QMap<int, Owner> _ownersMap;
-    QString _licenseTitle;
-    QString _customMessage;
+    QString _licenseTitle = "";
+    QString _customMessage = "";
+
 };
 
 }
diff --git a/tests/units/signtest.cpp b/tests/units/signtest.cpp
index 1a558c4..f6acc49 100644
--- a/tests/units/signtest.cpp
+++ b/tests/units/signtest.cpp
@@ -21,8 +21,23 @@ void SignTest::test() {
 }
 
 void SignTest::testJsonObj() {
-    CopyrighFixer::Signature sign_fromJson;
-    CopyrighFixer::Signature sign_toJson;
+    QString filename = "signature.json";
 
-    QVERIFY(sign_fromJson.fromJson() == sign_toJson.toJson());
+    CopyrighFixer::Owner ownerObj;
+    ownerObj.setName("QuasarApp");
+    ownerObj.setTimePoint(QDateTime::currentMSecsSinceEpoch());
+
+    QMap<int, CopyrighFixer::Owner> OwnerMap;
+    OwnerMap.insert(ownerObj.getTimePoint(), ownerObj);
+
+    CopyrighFixer::Signature sign_toJson;
+    sign_toJson.setLicenseTitle("Copyright (C) 2020-2021 QuasarApp.");
+    sign_toJson.setMessage("Distributed under the lgplv3 software license, see the accompany.");
+    sign_toJson.setMapOwners(OwnerMap);
+    sign_toJson.toJson(filename);
+
+    CopyrighFixer::Signature sign_fromJson;
+    sign_fromJson.fromJson(filename);
+
+    QVERIFY(sign_fromJson.isValid() == sign_toJson.isValid());
 }