From 2948b1cda8888d18857a831e68d4e08d4b463c13 Mon Sep 17 00:00:00 2001
From: Artem Los <artem@artemlos.net>
Date: Fri, 1 Feb 2019 10:56:02 +0100
Subject: [PATCH] Add the option to specify how old a license file can be to be
 valid (#12)

* Add the option to specify how old a license file can be to be valid

* Update docs and example
---
 .idea/workspace.xml                           | 161 +++++++++---------
 README.md                                     |  30 +++-
 example-app/src/Main.java                     |  20 ++-
 pom.xml                                       |   2 +-
 .../io/cryptolens/models/ActivateModel.java   |  16 ++
 .../java/io/cryptolens/models/LicenseKey.java |  26 ++-
 6 files changed, 167 insertions(+), 88 deletions(-)

diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 05d3222..0b033fe 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -7,7 +7,6 @@
   <component name="ChangeListManager">
     <list default="true" id="43b2cfd6-9146-4b1c-a0ca-55301d2b7477" name="Default Changelist" comment="">
       <change beforePath="$PROJECT_DIR$/example-app/src/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/example-app/src/Main.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/target/" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
@@ -20,25 +19,27 @@
     <session id="-1658630974">
       <usages-collector id="statistics.lifecycle.project">
         <counts>
+          <entry key="project.closed" value="1" />
           <entry key="project.open.time.0" value="1" />
           <entry key="project.open.time.10" value="1" />
-          <entry key="project.open.time.11" value="1" />
+          <entry key="project.open.time.11" value="2" />
           <entry key="project.open.time.13" value="1" />
           <entry key="project.open.time.2" value="2" />
-          <entry key="project.opened" value="6" />
+          <entry key="project.open.time.9" value="1" />
+          <entry key="project.opened" value="8" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.open">
         <counts>
           <entry key="CLASS" value="1" />
-          <entry key="JAVA" value="44" />
-          <entry key="XML" value="4" />
+          <entry key="JAVA" value="45" />
+          <entry key="XML" value="5" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.edit">
         <counts>
-          <entry key="JAVA" value="6880" />
-          <entry key="XML" value="85" />
+          <entry key="JAVA" value="7231" />
+          <entry key="XML" value="86" />
         </counts>
       </usages-collector>
     </session>
@@ -46,22 +47,19 @@
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Helpers.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/BasicResult.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="73">
-              <caret line="17" column="11" selection-start-line="17" selection-start-column="11" selection-end-line="17" selection-end-column="11" />
-              <folding>
-                <element signature="imports" expanded="true" />
-              </folding>
+            <state relative-caret-position="85">
+              <caret line="5" column="30" selection-start-line="5" selection-start-column="30" selection-end-line="5" selection-end-column="30" />
             </state>
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/internal/HelperMethods.java">
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/test/java/io/cryptolens/KeyTest.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="600">
-              <caret line="43" column="39" selection-start-line="43" selection-start-column="39" selection-end-line="43" selection-end-column="39" />
+            <state relative-caret-position="379">
+              <caret line="44" column="37" selection-start-line="44" selection-start-column="37" selection-end-line="44" selection-end-column="37" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -70,19 +68,10 @@
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/BasicResult.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="85">
-              <caret line="5" column="30" selection-start-line="5" selection-start-column="30" selection-end-line="5" selection-end-column="30" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/test/java/io/cryptolens/KeyTest.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Key.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="362">
-              <caret line="56" column="59" selection-start-line="56" selection-start-column="59" selection-end-line="56" selection-end-column="59" />
+            <state relative-caret-position="425">
+              <caret line="25" column="79" lean-forward="true" selection-start-line="25" selection-start-column="79" selection-end-line="25" selection-end-column="79" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -102,8 +91,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateModel.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="816">
-              <caret line="48" column="5" selection-start-line="48" selection-start-column="5" selection-end-line="48" selection-end-column="5" />
+            <state relative-caret-position="549">
+              <caret line="67" column="36" selection-start-line="67" selection-start-column="36" selection-end-line="67" selection-end-column="36" />
             </state>
           </provider>
         </entry>
@@ -117,11 +106,11 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="427">
-              <caret line="78" column="83" selection-start-line="78" selection-start-column="83" selection-end-line="78" selection-end-column="83" />
+            <state relative-caret-position="209">
+              <caret line="69" column="115" selection-start-line="69" selection-start-column="88" selection-end-line="69" selection-end-column="115" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -129,11 +118,20 @@
           </provider>
         </entry>
       </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/pom.xml">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="561">
+              <caret line="33" selection-start-line="33" selection-end-line="33" />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/DataObject.java">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="68">
-              <caret line="4" column="23" lean-forward="true" selection-start-line="4" selection-start-column="23" selection-end-line="4" selection-end-column="23" />
+              <caret line="4" column="23" selection-start-line="4" selection-start-column="23" selection-end-line="4" selection-end-column="23" />
             </state>
           </provider>
         </entry>
@@ -174,12 +172,10 @@
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/Cryptolens.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/Key.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/Helpers.java" />
-        <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateModel.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateResult.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/BasicResult.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/internal/HelperMethods.java" />
         <option value="$PROJECT_DIR$/src/test/java/io/cryptolens/AppTest.java" />
-        <option value="$PROJECT_DIR$/pom.xml" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Key.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Helpers.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/Customer.java" />
@@ -187,6 +183,8 @@
         <option value="$PROJECT_DIR$/src/test/java/io/cryptolens/KeyTest.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivatedMachine.java" />
         <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java" />
+        <option value="$PROJECT_DIR$/pom.xml" />
+        <option value="$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateModel.java" />
       </list>
     </option>
   </component>
@@ -197,7 +195,7 @@
       </MavenImportingSettings>
     </option>
   </component>
-  <component name="ProjectFrameBounds" extendedState="7">
+  <component name="ProjectFrameBounds" extendedState="6">
     <option name="x" value="-7" />
     <option name="width" value="1546" />
     <option name="height" value="830" />
@@ -307,8 +305,8 @@
           <select />
         </subPane>
       </pane>
-      <pane id="PackagesPane" />
       <pane id="Scope" />
+      <pane id="PackagesPane" />
     </panes>
   </component>
   <component name="PropertiesComponent">
@@ -460,10 +458,9 @@
     </todo-panel>
   </component>
   <component name="ToolWindowManager">
-    <frame x="-8" y="-8" width="1936" height="1056" extended-state="7" />
-    <editor active="true" />
+    <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
     <layout>
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.18443497" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.14978679" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Designer" order="2" />
       <window_info id="Favorites" order="3" side_tool="true" />
@@ -558,13 +555,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/pom.xml">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="102">
-          <caret line="6" column="14" selection-start-line="6" selection-start-column="14" selection-end-line="6" selection-end-column="14" />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/Cryptolens.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="17">
@@ -572,61 +562,71 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Key.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Helpers.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="714">
-          <caret line="42" selection-start-line="42" selection-end-line="42" />
+        <state relative-caret-position="136">
+          <caret line="17" column="11" selection-start-line="17" selection-start-column="11" selection-end-line="17" selection-end-column="11" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Helpers.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/internal/HelperMethods.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="73">
-          <caret line="17" column="11" selection-start-line="17" selection-start-column="11" selection-end-line="17" selection-end-column="11" />
+        <state relative-caret-position="578">
+          <caret line="43" column="39" selection-start-line="43" selection-start-column="39" selection-end-line="43" selection-end-column="39" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/DataObject.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/BasicResult.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="68">
-          <caret line="4" column="23" lean-forward="true" selection-start-line="4" selection-start-column="23" selection-end-line="4" selection-end-column="23" />
+        <state relative-caret-position="85">
+          <caret line="5" column="30" selection-start-line="5" selection-start-column="30" selection-end-line="5" selection-end-column="30" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/internal/HelperMethods.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateResult.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="600">
-          <caret line="43" column="39" selection-start-line="43" selection-start-column="39" selection-end-line="43" selection-end-column="39" />
+        <state relative-caret-position="85">
+          <caret line="5" column="28" selection-start-line="5" selection-start-column="28" selection-end-line="5" selection-end-column="28" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/methods/Key.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="425">
+          <caret line="25" column="79" lean-forward="true" selection-start-line="25" selection-start-column="79" selection-end-line="25" selection-end-column="79" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivatedMachine.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="85">
-          <caret line="5" column="24" selection-start-line="5" selection-start-column="24" selection-end-line="5" selection-end-column="24" />
+        <state relative-caret-position="209">
+          <caret line="69" column="115" selection-start-line="69" selection-start-column="88" selection-end-line="69" selection-end-column="115" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateModel.java">
+    <entry file="file://$PROJECT_DIR$/pom.xml">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="816">
-          <caret line="48" column="5" selection-start-line="48" selection-start-column="5" selection-end-line="48" selection-end-column="5" />
+        <state relative-caret-position="561">
+          <caret line="33" selection-start-line="33" selection-end-line="33" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateResult.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/DataObject.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="85">
-          <caret line="5" column="28" selection-start-line="5" selection-start-column="28" selection-end-line="5" selection-end-column="28" />
+        <state relative-caret-position="68">
+          <caret line="4" column="23" selection-start-line="4" selection-start-column="23" selection-end-line="4" selection-end-column="23" />
         </state>
       </provider>
     </entry>
@@ -637,27 +637,24 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/BasicResult.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivateModel.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="85">
-          <caret line="5" column="30" selection-start-line="5" selection-start-column="30" selection-end-line="5" selection-end-column="30" />
+        <state relative-caret-position="549">
+          <caret line="67" column="36" selection-start-line="67" selection-start-column="36" selection-end-line="67" selection-end-column="36" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/io/cryptolens/KeyTest.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/ActivatedMachine.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="362">
-          <caret line="56" column="59" selection-start-line="56" selection-start-column="59" selection-end-line="56" selection-end-column="59" />
-          <folding>
-            <element signature="imports" expanded="true" />
-          </folding>
+        <state relative-caret-position="85">
+          <caret line="5" column="24" selection-start-line="5" selection-start-column="24" selection-end-line="5" selection-end-column="24" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/io/cryptolens/models/LicenseKey.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/cryptolens/KeyTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="427">
-          <caret line="78" column="83" selection-start-line="78" selection-start-column="83" selection-end-line="78" selection-end-column="83" />
+        <state relative-caret-position="379">
+          <caret line="44" column="37" selection-start-line="44" selection-start-column="37" selection-end-line="44" selection-end-column="37" />
           <folding>
             <element signature="imports" expanded="true" />
           </folding>
diff --git a/README.md b/README.md
index 5dd0fa2..84c7eea 100644
--- a/README.md
+++ b/README.md
@@ -53,4 +53,32 @@ When loading it back, we can use the code below:
 
 ```java
 LicenseKey newLicense = LicenseKey.LoadFromString(RSAPubKey, licenseString);
-```
\ No newline at end of file
+```
+
+If you want to make sure that the license file is not too old, you can specify the maximum number of days as shown below (after 30 days, this method will return null).
+```java
+LicenseKey newLicense = LicenseKey.LoadFromString(RSAPubKey, licenseString, 30);
+```
+
+### Floating licenses
+[Floating licenses](https://help.cryptolens.io/licensing-models/floating) can be enabled by passing a floatingTimeInterval to the `ActivateModel`. Optionally, you can also allow customers to exceed the bound by specifying the maxOverdraft.
+
+The code below has a floatingTimeInterval of 300 seconds and maxOverdraft set to 1. To support floating licenses with overdraft, the call to `Helpers.IsOnRightMachine(license, true, true)` needs two boolean flags to be set to true.
+
+```java
+import io.cryptolens.methods.*;
+import io.cryptolens.models.*;
+
+public static void main(String args[]) {
+    String RSAPubKey = "<RSAKeyValue><Modulus>sGbvxwdlDbqFXOMlVUnAF5ew0t0WpPW7rFpI5jHQOFkht/326dvh7t74RYeMpjy357NljouhpTLA3a6idnn4j6c3jmPWBkjZndGsPL4Bqm+fwE48nKpGPjkj4q/yzT4tHXBTyvaBjA8bVoCTnu+LiC4XEaLZRThGzIn5KQXKCigg6tQRy0GXE13XYFVz/x1mjFbT9/7dS8p85n8BuwlY5JvuBIQkKhuCNFfrUxBWyu87CFnXWjIupCD2VO/GbxaCvzrRjLZjAngLCMtZbYBALksqGPgTUN7ZM24XbPWyLtKPaXF2i4XRR9u6eTj5BfnLbKAU5PIVfjIS+vNYYogteQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
+    String auth = "WyIyNjA5IiwiaWE5b0VFT3Q2eDlNR2FvbHBHK2VOYUZ4bzNjT3h5UkNrMCtiYnhPRSJd";
+
+    LicenseKey license = Key.Activate(auth, RSAPubKey, new ActivateModel(3349, "MTMPW-VZERP-JZVNZ-SCPZM", Helpers.GetMachineCode(), 300, 1));
+    if (license == null || !Helpers.IsOnRightMachine(license, true, true)) {
+        System.out.println("The license does not work.");
+    } else {
+        System.out.println("The license is valid!");
+        System.out.println("It will expire: " + license.Expires);
+    }
+}
+```
diff --git a/example-app/src/Main.java b/example-app/src/Main.java
index faf1ae1..fac9f54 100644
--- a/example-app/src/Main.java
+++ b/example-app/src/Main.java
@@ -4,13 +4,12 @@
 public class Main {
 
     public static void main(String[] args) {
+
         String RSAPubKey = "<RSAKeyValue><Modulus>sGbvxwdlDbqFXOMlVUnAF5ew0t0WpPW7rFpI5jHQOFkht/326dvh7t74RYeMpjy357NljouhpTLA3a6idnn4j6c3jmPWBkjZndGsPL4Bqm+fwE48nKpGPjkj4q/yzT4tHXBTyvaBjA8bVoCTnu+LiC4XEaLZRThGzIn5KQXKCigg6tQRy0GXE13XYFVz/x1mjFbT9/7dS8p85n8BuwlY5JvuBIQkKhuCNFfrUxBWyu87CFnXWjIupCD2VO/GbxaCvzrRjLZjAngLCMtZbYBALksqGPgTUN7ZM24XbPWyLtKPaXF2i4XRR9u6eTj5BfnLbKAU5PIVfjIS+vNYYogteQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
         String auth = "WyIyNjA5IiwiaWE5b0VFT3Q2eDlNR2FvbHBHK2VOYUZ4bzNjT3h5UkNrMCtiYnhPRSJd";
 
         LicenseKey license = Key.Activate(auth, RSAPubKey, new ActivateModel(3349, "ICVLD-VVSZR-ZTICT-YKGXL", Helpers.GetMachineCode()));
 
-        System.out.println(license);
-
         if (license == null || !Helpers.IsOnRightMachine(license)) {
             System.out.println("The license does not work.");
         } else {
@@ -20,9 +19,24 @@ public static void main(String[] args) {
 
             // Saving and loading a license (for offline use)
             String licenseString = license.SaveAsString();
-                LicenseKey newLicense = LicenseKey.LoadFromString(RSAPubKey, licenseString);
+            LicenseKey newLicense = LicenseKey.LoadFromString(RSAPubKey, licenseString, 1);
 
             System.out.println(newLicense.Expires);
         }
+
+    }
+
+    public static void main2() {
+        String RSAPubKey = "<RSAKeyValue><Modulus>sGbvxwdlDbqFXOMlVUnAF5ew0t0WpPW7rFpI5jHQOFkht/326dvh7t74RYeMpjy357NljouhpTLA3a6idnn4j6c3jmPWBkjZndGsPL4Bqm+fwE48nKpGPjkj4q/yzT4tHXBTyvaBjA8bVoCTnu+LiC4XEaLZRThGzIn5KQXKCigg6tQRy0GXE13XYFVz/x1mjFbT9/7dS8p85n8BuwlY5JvuBIQkKhuCNFfrUxBWyu87CFnXWjIupCD2VO/GbxaCvzrRjLZjAngLCMtZbYBALksqGPgTUN7ZM24XbPWyLtKPaXF2i4XRR9u6eTj5BfnLbKAU5PIVfjIS+vNYYogteQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
+        String auth = "WyIyNjA5IiwiaWE5b0VFT3Q2eDlNR2FvbHBHK2VOYUZ4bzNjT3h5UkNrMCtiYnhPRSJd";
+
+        LicenseKey license = Key.Activate(auth, RSAPubKey, new ActivateModel(3349, "MTMPW-VZERP-JZVNZ-SCPZM", Helpers.GetMachineCode(),300, 1 ));
+
+        if (license == null || !Helpers.IsOnRightMachine(license, true, true)) {
+            System.out.println("The license does not work.");
+        } else {
+            System.out.println("The license is valid!");
+            System.out.println("It will expire: " + license.Expires);
+        }
     }
 }
diff --git a/pom.xml b/pom.xml
index 5e690e9..0c8f372 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>io.cryptolens</groupId>
   <artifactId>cryptolens</artifactId>
   <packaging>jar</packaging>
-  <version>1.4</version>
+  <version>1.5</version>
   <name>cryptolens</name>
   <description>A client api to access Cryptolens Licensing API.</description>
   <url>https://github.com/cryptolens/cryptolens-java</url>
diff --git a/src/main/java/io/cryptolens/models/ActivateModel.java b/src/main/java/io/cryptolens/models/ActivateModel.java
index e91f9f9..5cbd8bb 100644
--- a/src/main/java/io/cryptolens/models/ActivateModel.java
+++ b/src/main/java/io/cryptolens/models/ActivateModel.java
@@ -52,6 +52,22 @@ public ActivateModel(int productId, String key, String machineCode) {
         Key = key;
         MachineCode = machineCode;
     }
+
+    public ActivateModel(int productId, String key, String machineCode, int floatingTimeInterval) {
+        ProductId = productId;
+        Key = key;
+        MachineCode = machineCode;
+        FloatingTimeInterval = floatingTimeInterval;
+    }
+
+    public ActivateModel(int productId, String key, String machineCode, int floatingTimeInterval, int maxOverdraft) {
+        ProductId = productId;
+        Key = key;
+        MachineCode = machineCode;
+        FloatingTimeInterval = floatingTimeInterval;
+        MaxOverdraft = maxOverdraft;
+    }
+
     public ActivateModel(int productId, String key, String machineCode, int fieldsToReturn, boolean metadata, int floatingTimeInterval, int maxOverdraft) {
         ProductId = productId;
         Key = key;
diff --git a/src/main/java/io/cryptolens/models/LicenseKey.java b/src/main/java/io/cryptolens/models/LicenseKey.java
index 50981b2..ae6de5c 100644
--- a/src/main/java/io/cryptolens/models/LicenseKey.java
+++ b/src/main/java/io/cryptolens/models/LicenseKey.java
@@ -46,14 +46,28 @@ public String SaveAsString() {
         return RawResponse;
     }
 
+
     /**
      * Load a license string (created with @see SaveAsString) into a license object.
      * Note, signature verification will be performed under the hood.
      * @param RSAPubKey Your RSA Public Key, which can be found <a href="https://app.cryptolens.io/docs/api/v3/QuickStart">here</a>.
      * @param licenseString The license key object stored as a string.
-     * @return A new license key object or null (if an error has occurred).
      */
     public static LicenseKey LoadFromString(String RSAPubKey, String licenseString) {
+        return LoadFromString(RSAPubKey, licenseString, -1);
+    }
+
+    /**
+     * Load a license string (created with @see SaveAsString) into a license object.
+     * Note, signature verification will be performed under the hood.
+     * @param RSAPubKey Your RSA Public Key, which can be found <a href="https://app.cryptolens.io/docs/api/v3/QuickStart">here</a>.
+     * @param licenseString The license key object stored as a string.
+     * @param signatureExpirationInterval If the license key was signed, this method
+     *                                    will check so that no more than "signatureExpirationInterval"
+     *                                    days have passed since the last activation.
+     * @return A new license key object or null (if an error has occurred).
+     */
+    public static LicenseKey LoadFromString(String RSAPubKey, String licenseString, int signatureExpirationInterval) {
 
         ActivateResult result = new Gson().fromJson(licenseString, ActivateResult.class);
 
@@ -82,6 +96,16 @@ public static LicenseKey LoadFromString(String RSAPubKey, String licenseString)
         LicenseKey license = new Gson().fromJson(s, LicenseKey.class);
         license.RawResponse = licenseString;
 
+        if(signatureExpirationInterval > 0) {
+            long unixTime = System.currentTimeMillis() / 1000L;
+
+            if(license.SignDate + 0x15180*signatureExpirationInterval < unixTime) {
+                // the license file has expired.
+                System.err.println("The license file has expired.");
+                return  null;
+            }
+        }
+
         return license;
     }
 }