diff --git a/h5p.classes.php b/h5p.classes.php
index 2661a43..32aeb38 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -310,12 +310,14 @@ interface H5PFrameworkInterface {
    *
    * @param int $libraryId
    *   Library identifier
+   * @param boolean $skipContent
+   *   Flag to indicate if content usage should be skipped
    * @return array
    *   Associative array containing:
    *   - content: Number of content using the library
    *   - libraries: Number of libraries depending on the library
    */
-  public function getLibraryUsage($libraryId);
+  public function getLibraryUsage($libraryId, $skipContent = FALSE);
 
   /**
    * Loads a library
@@ -2456,10 +2458,6 @@ class H5PCore {
       // Failed retrieving uuid
       if (!$registration) {
         $errorMessage = $this->h5pF->t('Site could not be registered with the hub. Please contact your site administrator.');
-        H5PCore::ajaxError(
-          $errorMessage,
-          'SITE_REGISTRATION_FAILED'
-        );
         $this->h5pF->setErrorMessage($errorMessage);
         $this->h5pF->setErrorMessage(
           $this->h5pF->t('The H5P Hub has been disabled until this problem can be resolved. You may still upload libraries through the "H5P Libraries" page.')
@@ -2506,7 +2504,7 @@ class H5PCore {
 
     // No data received
     if (!$result || empty($result)) {
-      return;
+      return FALSE;
     }
 
     // Handle libraries metadata
@@ -2975,16 +2973,18 @@ class H5PCore {
   public static function returnBytes($val) {
     $val  = trim($val);
     $last = strtolower($val[strlen($val) - 1]);
+    $bytes = (int) $val;
+
     switch ($last) {
       case 'g':
-        $val *= 1024;
+        $bytes *= 1024;
       case 'm':
-        $val *= 1024;
+        $bytes *= 1024;
       case 'k':
-        $val *= 1024;
+        $bytes *= 1024;
     }
 
-    return $val;
+    return $bytes;
   }
 
   /**
@@ -3009,6 +3009,67 @@ class H5PCore {
 
     return $can;
   }
+
+  /**
+   * Provide localization for the Core JS
+   * @return array
+   */
+  public function getLocalization() {
+    return array(
+      'fullscreen' => $this->h5pF->t('Fullscreen'),
+      'disableFullscreen' => $this->h5pF->t('Disable fullscreen'),
+      'download' => $this->h5pF->t('Download'),
+      'copyrights' => $this->h5pF->t('Rights of use'),
+      'embed' => $this->h5pF->t('Embed'),
+      'size' => $this->h5pF->t('Size'),
+      'showAdvanced' => $this->h5pF->t('Show advanced'),
+      'hideAdvanced' => $this->h5pF->t('Hide advanced'),
+      'advancedHelp' => $this->h5pF->t('Include this script on your website if you want dynamic sizing of the embedded content:'),
+      'copyrightInformation' => $this->h5pF->t('Rights of use'),
+      'close' => $this->h5pF->t('Close'),
+      'title' => $this->h5pF->t('Title'),
+      'author' => $this->h5pF->t('Author'),
+      'year' => $this->h5pF->t('Year'),
+      'source' => $this->h5pF->t('Source'),
+      'license' => $this->h5pF->t('License'),
+      'thumbnail' => $this->h5pF->t('Thumbnail'),
+      'noCopyrights' => $this->h5pF->t('No copyright information available for this content.'),
+      'downloadDescription' => $this->h5pF->t('Download this content as a H5P file.'),
+      'copyrightsDescription' => $this->h5pF->t('View copyright information for this content.'),
+      'embedDescription' => $this->h5pF->t('View the embed code for this content.'),
+      'h5pDescription' => $this->h5pF->t('Visit H5P.org to check out more cool content.'),
+      'contentChanged' => $this->h5pF->t('This content has changed since you last used it.'),
+      'startingOver' => $this->h5pF->t("You'll be starting over."),
+      'by' => $this->h5pF->t('by'),
+      'showMore' => $this->h5pF->t('Show more'),
+      'showLess' => $this->h5pF->t('Show less'),
+      'subLevel' => $this->h5pF->t('Sublevel'),
+      'confirmDialogHeader' => $this->h5pF->t('Confirm action'),
+      'confirmDialogBody' => $this->h5pF->t('Please confirm that you wish to proceed. This action is not reversible.'),
+      'cancelLabel' => $this->h5pF->t('Cancel'),
+      'confirmLabel' => $this->h5pF->t('Confirm'),
+      'licenseU' => $this->h5pF->t('Undisclosed'),
+      'licenseCCBY' => $this->h5pF->t('Attribution'),
+      'licenseCCBYSA' => $this->h5pF->t('Attribution-ShareAlike'),
+      'licenseCCBYND' => $this->h5pF->t('Attribution-NoDerivs'),
+      'licenseCCBYNC' => $this->h5pF->t('Attribution-NonCommercial'),
+      'licenseCCBYNCSA' => $this->h5pF->t('Attribution-NonCommercial-ShareAlike'),
+      'licenseCCBYNCND' => $this->h5pF->t('Attribution-NonCommercial-NoDerivs'),
+      'licenseCC40' => $this->h5pF->t('4.0 International'),
+      'licenseCC30' => $this->h5pF->t('3.0 Unported'),
+      'licenseCC25' => $this->h5pF->t('2.5 Generic'),
+      'licenseCC20' => $this->h5pF->t('2.0 Generic'),
+      'licenseCC10' => $this->h5pF->t('1.0 Generic'),
+      'licenseGPL' => $this->h5pF->t('General Public License'),
+      'licenseV3' => $this->h5pF->t('Version 3'),
+      'licenseV2' => $this->h5pF->t('Version 2'),
+      'licenseV1' => $this->h5pF->t('Version 1'),
+      'licensePD' => $this->h5pF->t('Public Domain'),
+      'licenseCC010' => $this->h5pF->t('CC0 1.0 Universal (CC0 1.0) Public Domain Dedication'),
+      'licensePDM' => $this->h5pF->t('Public Domain Mark'),
+      'licenseC' => $this->h5pF->t('Copyright')
+    );
+  }
 }
 
 /**
@@ -3930,6 +3991,29 @@ class H5PContentValidator {
     static $semantics;
 
     if ($semantics === NULL) {
+      $cc_versions = array(
+        (object) array(
+          'value' => '4.0',
+          'label' => $this->h5pF->t('4.0 International')
+        ),
+        (object) array(
+          'value' => '3.0',
+          'label' => $this->h5pF->t('3.0 Unported')
+        ),
+        (object) array(
+          'value' => '2.5',
+          'label' => $this->h5pF->t('2.5 Generic')
+        ),
+        (object) array(
+          'value' => '2.0',
+          'label' => $this->h5pF->t('2.0 Generic')
+        ),
+        (object) array(
+          'value' => '1.0',
+          'label' => $this->h5pF->t('1.0 Generic')
+        )
+      );
+
       $semantics = (object) array(
         'name' => 'copyright',
         'type' => 'group',
@@ -3979,49 +4063,81 @@ class H5PContentValidator {
               ),
               (object) array(
                 'value' => 'CC BY',
-                'label' => $this->h5pF->t('Attribution 4.0')
+                'label' => $this->h5pF->t('Attribution'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'CC BY-SA',
-                'label' => $this->h5pF->t('Attribution-ShareAlike 4.0')
+                'label' => $this->h5pF->t('Attribution-ShareAlike'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'CC BY-ND',
-                'label' => $this->h5pF->t('Attribution-NoDerivs 4.0')
+                'label' => $this->h5pF->t('Attribution-NoDerivs'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'CC BY-NC',
-                'label' => $this->h5pF->t('Attribution-NonCommercial 4.0')
+                'label' => $this->h5pF->t('Attribution-NonCommercial'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'CC BY-NC-SA',
-                'label' => $this->h5pF->t('Attribution-NonCommercial-ShareAlike 4.0')
+                'label' => $this->h5pF->t('Attribution-NonCommercial-ShareAlike'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'CC BY-NC-ND',
-                'label' => $this->h5pF->t('Attribution-NonCommercial-NoDerivs 4.0')
+                'label' => $this->h5pF->t('Attribution-NonCommercial-NoDerivs'),
+                'versions' => $cc_versions
               ),
               (object) array(
                 'value' => 'GNU GPL',
-                'label' => $this->h5pF->t('General Public License v3')
+                'label' => $this->h5pF->t('General Public License'),
+                'versions' => array(
+                  (object) array(
+                    'value' => 'v3',
+                    'label' => $this->h5pF->t('Version 3')
+                  ),
+                  (object) array(
+                    'value' => 'v2',
+                    'label' => $this->h5pF->t('Version 2')
+                  ),
+                  (object) array(
+                    'value' => 'v1',
+                    'label' => $this->h5pF->t('Version 1')
+                  )
+                )
               ),
               (object) array(
                 'value' => 'PD',
-                'label' => $this->h5pF->t('Public Domain')
-              ),
-              (object) array(
-                'value' => 'ODC PDDL',
-                'label' => $this->h5pF->t('Public Domain Dedication and Licence')
-              ),
-              (object) array(
-                'value' => 'CC PDM',
-                'label' => $this->h5pF->t('Public Domain Mark')
+                'label' => $this->h5pF->t('Public Domain'),
+                'versions' => array(
+                  (object) array(
+                    'value' => '-',
+                    'label' => '-'
+                  ),
+                  (object) array(
+                    'value' => 'CC0 1.0',
+                    'label' => $this->h5pF->t('CC0 1.0 Universal')
+                  ),
+                  (object) array(
+                    'value' => 'CC PDM',
+                    'label' => $this->h5pF->t('Public Domain Mark')
+                  )
+                )
               ),
               (object) array(
                 'value' => 'C',
                 'label' => $this->h5pF->t('Copyright')
               )
             )
+          ),
+          (object) array(
+            'name' => 'version',
+            'type' => 'select',
+            'label' => $this->h5pF->t('License Version'),
+            'options' => array()
           )
         )
       );
diff --git a/js/h5p.js b/js/h5p.js
index 26bd5f2..d68ed00 100644
--- a/js/h5p.js
+++ b/js/h5p.js
@@ -1234,16 +1234,65 @@ H5P.MediaCopyright = function (copyright, labels, order, extraFields) {
   };
 
   /**
-   * Get humanized value for field.
+   * Get humanized value for the license field.
    *
    * @private
-   * @param {string} fieldName
-   * @param {string} value
+   * @param {string} license
+   * @param {string} [version]
    * @returns {string}
    */
-  var humanizeValue = function (fieldName, value) {
-    if (fieldName === 'license') {
-      return H5P.copyrightLicenses[value];
+  var humanizeLicense = function (license, version) {
+    var copyrightLicense = H5P.copyrightLicenses[license];
+
+    // Build license string
+    var value = '';
+    if (!(license === 'PD' && version)) {
+      // Add license label
+      value += (copyrightLicense.hasOwnProperty('label') ? copyrightLicense.label : copyrightLicense);
+    }
+
+    // Check for version info
+    var versionInfo;
+    if (version && copyrightLicense.versions[version]) {
+      versionInfo = copyrightLicense.versions[version];
+    }
+
+    if (versionInfo) {
+      // Add license version
+      if (value) {
+        value += ' ';
+      }
+      value += (versionInfo.hasOwnProperty('label') ? versionInfo.label : versionInfo);
+    }
+
+    // Add link if specified
+    var link;
+    if (copyrightLicense.hasOwnProperty('link')) {
+      link = copyrightLicense.link.replace(':version', copyrightLicense.linkVersions ? copyrightLicense.linkVersions[version] : version);
+    }
+    else if (versionInfo && copyrightLicense.hasOwnProperty('link')) {
+      link = versionInfo.link
+    }
+    if (link) {
+      value = '<a href="' + link + '" target="_blank">' + value + '</a>';
+    }
+
+    // Generate parenthesis
+    var parenthesis = '';
+    if (license !== 'PD' && license !== 'C') {
+      parenthesis += license;
+    }
+    if (version && version !== 'CC0 1.0') {
+      if (parenthesis && license !== 'GNU GPL') {
+        parenthesis += ' ';
+      }
+      parenthesis += version;
+    }
+    if (parenthesis) {
+      value += ' (' + parenthesis + ')';
+    }
+    if (license === 'C') {
+      value += ' &copy;';
     }
 
     return value;
@@ -1265,7 +1314,11 @@ H5P.MediaCopyright = function (copyright, labels, order, extraFields) {
     for (var i = 0; i < order.length; i++) {
       var fieldName = order[i];
       if (copyright[fieldName] !== undefined) {
-        list.add(new H5P.Field(getLabel(fieldName), humanizeValue(fieldName, copyright[fieldName])));
+        var humanValue = copyright[fieldName];
+        if (fieldName === 'license') {
+          humanValue = humanizeLicense(copyright.license, copyright.version);
+        }
+        list.add(new H5P.Field(getLabel(fieldName), humanValue));
       }
     }
   }
@@ -1288,7 +1341,7 @@ H5P.MediaCopyright = function (copyright, labels, order, extraFields) {
   this.undisclosed = function () {
     if (list.size() === 1) {
       var field = list.get(0);
-      if (field.getLabel() === getLabel('license') && field.getValue() === humanizeValue('license', 'U')) {
+      if (field.getLabel() === getLabel('license') && field.getValue() === humanizeLicense('U')) {
         return true;
       }
     }
@@ -1320,26 +1373,6 @@ H5P.MediaCopyright = function (copyright, labels, order, extraFields) {
   };
 };
 
-/**
- * Maps copyright license codes to their human readable counterpart.
- *
- * @type {Object}
- */
-H5P.copyrightLicenses = {
-  'U': 'Undisclosed',
-  'CC BY': '<a href="http://creativecommons.org/licenses/by/4.0/legalcode" target="_blank">Attribution 4.0</a>',
-  'CC BY-SA': '<a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode" target="_blank">Attribution-ShareAlike 4.0</a>',
-  'CC BY-ND': '<a href="https://creativecommons.org/licenses/by-nd/4.0/legalcode" target="_blank">Attribution-NoDerivs 4.0</a>',
-  'CC BY-NC': '<a href="https://creativecommons.org/licenses/by-nc/4.0/legalcode" target="_blank">Attribution-NonCommercial 4.0</a>',
-  'CC BY-NC-SA': '<a href="https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode" target="_blank">Attribution-NonCommercial-ShareAlike 4.0</a>',
-  'CC BY-NC-ND': '<a href="https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode" target="_blank">Attribution-NonCommercial-NoDerivs 4.0</a>',
-  'GNU GPL': '<a href="http://www.gnu.org/licenses/gpl-3.0-standalone.html" target="_blank">General Public License v3</a>',
-  'PD': 'Public Domain',
-  'ODC PDDL': '<a href="http://opendatacommons.org/licenses/pddl/1.0/" target="_blank">Public Domain Dedication and Licence</a>',
-  'CC PDM': 'Public Domain Mark',
-  'C': 'Copyright'
-};
-
 /**
  * A simple and elegant class for creating thumbnails of images.
  *
@@ -1978,6 +2011,83 @@ H5P.createTitle = function (rawTitle, maxLength) {
   // Init H5P when page is fully loadded
   $(document).ready(function () {
 
+    var ccVersions = {
+      '4.0': H5P.t('licenseCC40'),
+      '3.0': H5P.t('licenseCC30'),
+      '2.5': H5P.t('licenseCC25'),
+      '2.0': H5P.t('licenseCC20'),
+      '1.0': H5P.t('licenseCC10'),
+    };
+
+    /**
+     * Maps copyright license codes to their human readable counterpart.
+     *
+     * @type {Object}
+     */
+    H5P.copyrightLicenses = {
+      'U': H5P.t('licenseU'),
+      'CC BY': {
+        label: H5P.t('licenseCCBY'),
+        link: 'http://creativecommons.org/licenses/by/:version/legalcode',
+        versions: ccVersions
+      },
+      'CC BY-SA': {
+        label: H5P.t('licenseCCBYSA'),
+        link: 'http://creativecommons.org/licenses/by-sa/:version/legalcode',
+        versions: ccVersions
+      },
+      'CC BY-ND': {
+        label: H5P.t('licenseCCBYND'),
+        link: 'http://creativecommons.org/licenses/by-nd/:version/legalcode',
+        versions: ccVersions
+      },
+      'CC BY-NC': {
+        label: H5P.t('licenseCCBYNC'),
+        link: 'http://creativecommons.org/licenses/by-nc/:version/legalcode',
+        versions: ccVersions
+      },
+      'CC BY-NC-SA': {
+        label: H5P.t('licenseCCBYNCSA'),
+        link: 'http://creativecommons.org/licenses/by-nc-sa/:version/legalcode',
+        versions: ccVersions
+      },
+      'CC BY-NC-ND': {
+        label: H5P.t('licenseCCBYNCND'),
+        link: 'http://creativecommons.org/licenses/by-nc-nd/:version/legalcode',
+        versions: ccVersions
+      },
+      'GNU GPL': {
+        label: H5P.t('licenseGPL'),
+        link: 'http://www.gnu.org/licenses/gpl-:version-standalone.html',
+        linkVersions: {
+          'v3': '3.0',
+          'v2': '2.0',
+          'v1': '1.0'
+        },
+        versions: {
+          'v3': H5P.t('licenseV3'),
+          'v2': H5P.t('licenseV2'),
+          'v1': H5P.t('licenseV1')
+        }
+      },
+      'PD': {
+        label: H5P.t('licensePD'),
+        versions: {
+          'CC0 1.0': {
+            label: H5P.t('licenseCC010'),
+            link: 'https://creativecommons.org/publicdomain/zero/1.0/'
+          },
+          'CC PDM': {
+            label: H5P.t('licensePDM'),
+            link: 'https://creativecommons.org/publicdomain/mark/1.0/'
+          }
+        }
+      },
+      'ODC PDDL': '<a href="http://opendatacommons.org/licenses/pddl/1.0/" target="_blank">Public Domain Dedication and Licence</a>',
+      'CC PDM': H5P.t('licensePDM'),
+      'C': H5P.t('licenseC'),
+    };
+
     /**
      * Indicates if H5P is embedded on an external page using iframe.
      * @member {boolean} H5P.externalEmbed