Initial.

README.md

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+Lists of available value sets in MD
+============================================
+
+This repository contains a PHP file listing all licenses available to set at
+museum-digital.

src/MDLicensesSet.php

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+<?PHP
+/**
+ * Contains a class of available licenses.
+ */
+
+/**
+ * Class containing static functions for getting available licenses on md.
+ */
+class MDLicensesSet {
+
+    const AVAILABLE_LICENSES = [
+
+        'CC BY-NC-SA'           => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
+        'CC BY-NC-ND'           => 'https://creativecommons.org/licenses/by-nc-nd/4.0/',
+        'CC BY-NC'              => 'https://creativecommons.org/licenses/by-nc/4.0/',
+        'CC BY-ND'              => 'https://creativecommons.org/licenses/by-nd/4.0/',
+        'CC BY-SA'              => 'https://creativecommons.org/licenses/by-sa/4.0/',
+        'CC BY'                 => 'https://creativecommons.org/licenses/by/4.0/',
+        'CC0'                   => 'https://creativecommons.org/publicdomain/zero/1.0/',
+        'RR-F'                  => 'https://www.europeana.eu/rights/rr-f/',
+        'RR-P'                  => 'https://www.europeana.eu/rights/rr-p/',
+        'RR-R'                  => 'https://www.europeana.eu/rights/rr-r/',
+        'Public Domain Mark'    => 'https://creativecommons.org/publicdomain/mark/1.0/',
+        'Orphan Work'           => '',
+
+    ];
+
+    /**
+     * Function for checking the availability of a provided license at
+     * museum-digital.
+     * If the license is available, the corresponding URL is returned. Else, false
+     * is returned.
+     *
+     * @param string $license License to check.
+     *
+     * @return string|boolean
+     */
+    final public static function checkLicenseAvailable(string $license) {
+        if (isset(self::AVAILABLE_LICENSES[$license])) return self::AVAILABLE_LICENSES[$license];
+        return false;
+
+    }
+
+}