diff --git a/convert-protection-text.php b/convert-protection-text.php
new file mode 100644
index 0000000..053eff7
--- /dev/null
+++ b/convert-protection-text.php
@@ -0,0 +1,135 @@
+<?php
+
+/*
+Plugin Name: Convert Protection Text
+Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
+Description: A brief description of the Plugin.
+Version: 1.0
+Author: nobu
+Author URI: http://URI_Of_The_Plugin_Author
+License: A "Slug" license name e.g. GPL2
+*/
+
+class CNV_Protection_Text {
+
+	const ALERT_TEXT = 'このコンテンツはパスワードで保護されています。閲覧するには以下にパスワードを入力してください。';
+	const BTN_LABEL = 'パスワード';
+	const BTN_TEXT = '確定';
+
+	public function __construct() {
+		add_action( 'admin_menu', array( $this, 'add_pages' ) );
+		add_filter( 'protected_title_format', array( $this, 'edit_protected_word' ) );
+		add_filter( 'the_password_form', array( $this, 'my_password_form' ) );
+	}
+
+	public function add_pages() {
+		add_menu_page( 'アクセス権限ページ設定', 'アクセス権限ページ設定', 'level_8', __FILE__, array(
+			$this,
+			'show_text_option_page'
+		), '', 90 );
+	}
+
+	public function show_text_option_page() {
+		//$_POST['_cnv_protect_options'])があったら保存
+		if ( isset( $_POST['_cnv_protect_options'] ) ) {
+			check_admin_referer( 'cnv_options' );
+			$opt = $_POST['_cnv_protect_options'];
+			update_option( '_cnv_protect_options', $opt );
+			?>
+			<div class="updated fade"><p><strong>設定を保存しました</strong></p></div><?php
+		}
+		?>
+		<div class="wrap">
+			<div id="icon-options-general" class="icon32"><br/></div>
+			<h2>アクセス権限ページ設定</h2>
+			<form action="" method="post">
+				<?php
+				wp_nonce_field( 'cnv_options' );
+				$opt        = get_option( '_cnv_protect_options' );
+				$show_radio = $opt['flag'] ?? 1;
+				$show_text  = $opt['text'] ?? self::ALERT_TEXT;
+				$show_label = $opt['label'] ?? self::BTN_LABEL;
+				$show_btn   = $opt['btn'] ?? self::BTN_TEXT;
+				?>
+				<table class="form-table">
+					<tr valign="top">
+						<th scope="row"><label for="inputtext">保護中</label></th>
+						<td>
+							<?php if ( $show_radio == 2 ) : ?>
+								<label>
+									<input type="radio" name="_cnv_protect_options[flag]" value="1">表示
+								</label>
+								<label>
+									<input type="radio" name="_cnv_protect_options[flag]" value="2" checked>非表示
+								</label>
+							<?php elseif ( $show_radio == 1 ): ?>
+								<label>
+									<input type="radio" name="_cnv_protect_options[flag]" value="1" checked>表示
+								</label>
+								<label>
+									<input type="radio" name="_cnv_protect_options[flag]" value="2">非表示
+								</label>
+							<?php endif; ?>
+						</td>
+					</tr>
+					<tr valign="top">
+						<th scope="row">メッセージ</th>
+						<td>
+                            <textarea name="_cnv_protect_options[text]" rows="4"
+                                      cols="60"><?php echo $show_text; ?></textarea>
+						</td>
+					</tr>
+					<tr valign="top">
+						<th scope="row">ボタンラベル</th>
+						<td>
+							<input type="text" name="_cnv_protect_options[label]" value="<?php echo $show_label; ?>">
+						</td>
+					</tr>
+					<tr valign="top">
+						<th scope="row">ボタン名</th>
+						<td>
+							<input type="text" name="_cnv_protect_options[btn]" value="<?php echo $show_btn; ?>">
+						</td>
+					</tr>
+				</table>
+				<p class="submit"><input type="submit" name="Submit" class="button-primary" value="変更を保存"/></p>
+			</form>
+			<!-- /.wrap --></div>
+		<?php
+	}
+
+	public function edit_protected_word( $text ) {
+		$opt = get_option( '_cnv_protect_options' );
+		if ( isset( $opt['flag'] ) && $opt['flag'] == 2 ) {
+			return '%s';
+		}
+
+		return $text;
+	}
+
+	//パスワード保護時のメッセージ
+	public function my_password_form( $form_text ): string {
+		$opt = get_option( '_cnv_protect_options' );
+		if ( isset( $opt['text'] ) && ! empty( $opt['text'] ) ) {
+			$alert_text = $opt['text'];
+		} else {
+			$alert_text = self::ALERT_TEXT;
+		}
+		if ( isset( $opt['label'] ) && ! empty( $opt['label'] ) ) {
+			$btn_label = $opt['label'] . ' : ';
+		} else {
+			$btn_label = self::BTN_LABEL . ' : ';
+		}
+		if ( isset( $opt['btn'] ) && ! empty( $opt['btn'] ) ) {
+			$btn_text = $opt['btn'];
+		} else {
+			$btn_text = self::BTN_TEXT;
+		}
+
+		return '<form action="' . home_url() . '/wp-login.php?action=postpass" class="post-password-form" method="post">
+<p>' . nl2br( $alert_text ) . '</p>
+<p><label for="pwbox">' . $btn_label . '<input name="post_password" id="pwbox" type="password" size="20"></label> <input type="submit" name="Submit" value="' . $btn_text . '"></p></form>';
+	}
+}
+
+new CNV_Protection_Text;
\ No newline at end of file
diff --git a/nb-protection-text.php b/nb-protection-text.php
deleted file mode 100644
index 54d612c..0000000
--- a/nb-protection-text.php
+++ /dev/null
@@ -1,132 +0,0 @@
-<?php
-
-/*
-Plugin Name: Protection Text
-Description: パスワード制限ページの「保護中」とテキストを変更します
-Author: Nob Kim
-Version: 1.0
-*/
-
-class NB_ProtectionText {
-
-	const ALERT_TEXT = 'このコンテンツはパスワードで保護されています。閲覧するには以下にパスワードを入力してください。';
-	const BTN_LABEL = 'パスワード';
-	const BTN_TEXT = '確定';
-
-	public function __construct() {
-		add_action( 'admin_menu', array( $this, 'add_pages' ) );
-		add_filter( 'protected_title_format', array( $this, 'edit_protected_word' ) );
-		add_filter( 'the_password_form', array( $this, 'my_password_form' ) );
-	}
-
-	public function add_pages() {
-		add_menu_page( 'アクセス権限ページ設定', 'アクセス権限ページ設定', 'level_8', __FILE__, array(
-			$this,
-			'show_text_option_page'
-		), '', 90 );
-	}
-
-	public function show_text_option_page() {
-		//$_POST['nb_protect_options'])があったら保存
-		if ( isset( $_POST['nb_protect_options'] ) ) {
-			check_admin_referer( 'shoptions' );
-			$opt = $_POST['nb_protect_options'];
-			update_option( 'nb_protect_options', $opt );
-			?>
-            <div class="updated fade"><p><strong>設定を保存しました</strong></p></div><?php
-		}
-		?>
-        <div class="wrap">
-            <div id="icon-options-general" class="icon32"><br/></div>
-            <h2>アクセス権限ページ設定</h2>
-            <form action="" method="post">
-				<?php
-				wp_nonce_field( 'shoptions' );
-				$opt = get_option( 'nb_protect_options' );
-				$show_radio = $opt['flag'] ?? 1;
-				$show_text = $opt['text'] ?? self::ALERT_TEXT;
-				$show_label = $opt['label'] ?? self::BTN_LABEL;
-				$show_btn = $opt['btn'] ?? self::BTN_TEXT;
-				?>
-                <table class="form-table">
-                    <tr valign="top">
-                        <th scope="row"><label for="inputtext">保護中</label></th>
-                        <td>
-							<?php if ( $show_radio == 2 ) : ?>
-                                <label>
-                                    <input type="radio" name="nb_protect_options[flag]" value="1">表示
-                                </label>
-                                <label>
-                                    <input type="radio" name="nb_protect_options[flag]" value="2" checked>非表示
-                                </label>
-							<?php elseif ( $show_radio == 1 ): ?>
-                                <label>
-                                    <input type="radio" name="nb_protect_options[flag]" value="1" checked>表示
-                                </label>
-                                <label>
-                                    <input type="radio" name="nb_protect_options[flag]" value="2">非表示
-                                </label>
-							<?php endif; ?>
-                        </td>
-                    </tr>
-                    <tr valign="top">
-                        <th scope="row">メッセージ</th>
-                        <td>
-                            <textarea name="nb_protect_options[text]" rows="4"
-                                      cols="60"><?php echo $show_text; ?></textarea>
-                        </td>
-                    </tr>
-                    <tr valign="top">
-                        <th scope="row">ボタンラベル</th>
-                        <td>
-                            <input type="text" name="nb_protect_options[label]" value="<?php echo $show_label; ?>">
-                        </td>
-                    </tr>
-                    <tr valign="top">
-                        <th scope="row">ボタン名</th>
-                        <td>
-                            <input type="text" name="nb_protect_options[btn]" value="<?php echo $show_btn; ?>">
-                        </td>
-                    </tr>
-                </table>
-                <p class="submit"><input type="submit" name="Submit" class="button-primary" value="変更を保存"/></p>
-            </form>
-            <!-- /.wrap --></div>
-		<?php
-	}
-
-	public function edit_protected_word( $text ) {
-		$opt = get_option( 'nb_protect_options' );
-		if ( isset( $opt['flag'] ) && $opt['flag'] == 2 ) {
-			return '%s';
-		}
-
-		return $text;
-	}
-
-	//パスワード保護時のメッセージ
-	public function my_password_form( $form_text ): string {
-		$opt = get_option( 'nb_protect_options' );
-		if ( isset( $opt['text'] ) && ! empty( $opt['text'] ) ) {
-			$alert_text = $opt['text'];
-		} else {
-			$alert_text = self::ALERT_TEXT;
-		}
-		if ( isset( $opt['label'] ) && ! empty( $opt['label'] ) ) {
-			$btn_label = $opt['label'] . ' : ';
-		} else {
-			$btn_label = self::BTN_LABEL . ' : ';
-		}
-		if ( isset( $opt['btn'] ) && ! empty( $opt['btn'] ) ) {
-			$btn_text = $opt['btn'];
-		} else {
-			$btn_text = self::BTN_TEXT;
-		}
-
-		return '<form action="' . home_url() . '/wp-login.php?action=postpass" class="post-password-form" method="post">
-<p>' . nl2br( $alert_text ) . '</p>
-<p><label for="pwbox">' . $btn_label . '<input name="post_password" id="pwbox" type="password" size="20"></label> <input type="submit" name="Submit" value="' . $btn_text . '"></p></form>';
-	}
-}
-
-$showtext = new NB_ProtectionText;
\ No newline at end of file
diff --git a/uninstall.php b/uninstall.php
index 4a21fe7..c9dea9c 100644
--- a/uninstall.php
+++ b/uninstall.php
@@ -5,4 +5,4 @@ if (!defined('WP_UNINSTALL_PLUGIN')) {
 }
 
 // オプション設定の削除
-delete_option('nb_protect_options');
\ No newline at end of file
+delete_option('_cnv_protect_options');
\ No newline at end of file