diff --git a/class/class.cnv_protection_txt.php b/class/class.conv_protection_txt.php
similarity index 69%
rename from class/class.cnv_protection_txt.php
rename to class/class.conv_protection_txt.php
index c905be4..4470ba2 100644
--- a/class/class.cnv_protection_txt.php
+++ b/class/class.conv_protection_txt.php
@@ -3,9 +3,9 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 } // Exit if accessed directly
 
-if ( ! class_exists( 'cnv_protection_txt' ) ) {
+if ( ! class_exists( 'conv_protection_txt' ) ) {
 
-	class cnv_protection_txt {
+	class conv_protection_txt {
 
 		public function __construct() {
 			add_action( 'admin_menu', array( $this, 'add_pages' ) );
@@ -27,17 +27,17 @@ if ( ! class_exists( 'cnv_protection_txt' ) ) {
 		}
 
 		public function show_text_option_page() {
-			$update_option = filter_input( INPUT_POST, '_cnv_protect_options', FILTER_SANITIZE_STRING, FILTER_REQUIRE_ARRAY );
+			$update_option = filter_input( INPUT_POST, 'conv_protection_options', FILTER_SANITIZE_STRING, FILTER_REQUIRE_ARRAY );
 			if ( ! empty( $update_option ) ) {
-				check_admin_referer( 'cnv_options' );
-				update_option( '_cnv_protect_options', $update_option );
-				include_once cnv_protection_txt_settings::TEMPLATE_DIR . 'success.php';
+				check_admin_referer( 'conv_options' );
+				update_option( 'conv_protection_options', $update_option );
+				include_once conv_protection_txt_settings::TEMPLATE_DIR . 'success.php';
 			}
-			include_once cnv_protection_txt_settings::TEMPLATE_DIR . 'cnv_protection_txt_form.php';
+			include_once conv_protection_txt_settings::TEMPLATE_DIR . 'conv_protection_txt_form.php';
 		}
 
 		public function edit_protected_word( $text ) {
-			$opt = get_option( '_cnv_protect_options' );
+			$opt = get_option( 'conv_protection_options' );
 			if ( isset( $opt['flag'] ) && $opt['flag'] == 2 ) {
 				return '%s';
 			}
@@ -47,21 +47,21 @@ if ( ! class_exists( 'cnv_protection_txt' ) ) {
 
 		//パスワード保護時のメッセージ
 		public function protect_password_form( $form_text ): string {
-			$opt = get_option( '_cnv_protect_options' );
+			$opt = get_option( 'conv_protection_options' );
 			if ( isset( $opt['text'] ) && ! empty( $opt['text'] ) ) {
 				$alert_text = $opt['text'];
 			} else {
-				$alert_text = cnv_protection_txt_settings::ALERT_TEXT;
+				$alert_text = conv_protection_txt_settings::ALERT_TEXT;
 			}
 			if ( isset( $opt['label'] ) && ! empty( $opt['label'] ) ) {
 				$btn_label = $opt['label'] . ' : ';
 			} else {
-				$btn_label = cnv_protection_txt_settings::BTN_LABEL . ' : ';
+				$btn_label = conv_protection_txt_settings::BTN_LABEL . ' : ';
 			}
 			if ( isset( $opt['btn'] ) && ! empty( $opt['btn'] ) ) {
 				$btn_text = $opt['btn'];
 			} else {
-				$btn_text = cnv_protection_txt_settings::BTN_TEXT;
+				$btn_text = conv_protection_txt_settings::BTN_TEXT;
 			}
 
 			return '
diff --git a/class/cnv_protection_txt_settings.php b/class/conv_protection_txt_settings.php
similarity index 79%
rename from class/cnv_protection_txt_settings.php
rename to class/conv_protection_txt_settings.php
index 7aa4309..8a83b5f 100644
--- a/class/cnv_protection_txt_settings.php
+++ b/class/conv_protection_txt_settings.php
@@ -4,9 +4,9 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 } // Exit if accessed directly
 
-if ( ! class_exists( 'cnv_protection_txt_settings' ) ) {
+if ( ! class_exists( 'conv_protection_txt_settings' ) ) {
 
-	class cnv_protection_txt_settings{
+	class conv_protection_txt_settings{
 
 		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';
diff --git a/convert-protection-text.php b/convert-protection-text.php
index 76563f8..858046f 100644
--- a/convert-protection-text.php
+++ b/convert-protection-text.php
@@ -22,7 +22,11 @@ License: GPLv2
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
-include_once __DIR__ . '/class/cnv_protection_txt_settings.php';
-include_once __DIR__ . '/class/class.cnv_protection_txt.php';
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+} // Exit if accessed directly
 
-new cnv_protection_txt;
\ No newline at end of file
+include_once __DIR__ . '/class/conv_protection_txt_settings.php';
+include_once __DIR__ . '/class/class.conv_protection_txt.php';
+
+new conv_protection_txt;
\ No newline at end of file
diff --git a/template/cnv_protection_txt_form.php b/template/conv_protection_txt_form.php
similarity index 59%
rename from template/cnv_protection_txt_form.php
rename to template/conv_protection_txt_form.php
index def38b4..f27535f 100644
--- a/template/cnv_protection_txt_form.php
+++ b/template/conv_protection_txt_form.php
@@ -1,13 +1,18 @@
+<?php
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+} // Exit if accessed directly
+?>
 <div class="wrap">
     <h2>限定公開ページテキストカスタマイズ</h2>
     <form action="" method="post">
 		<?php
-		wp_nonce_field( 'cnv_options' );
-		$opt        = get_option( '_cnv_protect_options' );
+		wp_nonce_field( 'conv_options' );
+		$opt        = get_option( 'conv_protection_options' );
 		$show_radio = $opt['flag'] ?? 1;
-		$show_text  = $opt['text'] ?? cnv_protection_txt_settings::ALERT_TEXT;
-		$show_label = $opt['label'] ?? cnv_protection_txt_settings::BTN_LABEL;
-		$show_btn   = $opt['btn'] ?? cnv_protection_txt_settings::BTN_TEXT;
+		$show_text  = $opt['text'] ?? conv_protection_txt_settings::ALERT_TEXT;
+		$show_label = $opt['label'] ?? conv_protection_txt_settings::BTN_LABEL;
+		$show_btn   = $opt['btn'] ?? conv_protection_txt_settings::BTN_TEXT;
 		?>
         <table class="form-table">
             <tr valign="top">
@@ -15,17 +20,17 @@
                 <td>
 					<?php if ( $show_radio == 2 ) : ?>
                         <label>
-                            <input type="radio" name="_cnv_protect_options[flag]" value="1">表示
+                            <input type="radio" name="conv_protection_options[flag]" value="1">表示
                         </label>
                         <label>
-                            <input type="radio" name="_cnv_protect_options[flag]" value="2" checked>非表示
+                            <input type="radio" name="conv_protection_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
+                            <input type="radio" name="conv_protection_options[flag]" value="1" checked>表示
                         </label>
                         <label>
-                            <input type="radio" name="_cnv_protect_options[flag]" value="2">非表示
+                            <input type="radio" name="conv_protection_options[flag]" value="2">非表示
                         </label>
 					<?php endif; ?>
                 </td>
@@ -33,21 +38,21 @@
             <tr valign="top">
                 <th scope="row">メッセージ</th>
                 <td>
-                    <textarea name="_cnv_protect_options[text]" rows="4"
+                    <textarea name="conv_protection_options[text]" rows="4"
                               cols="60"><?php echo esc_attr( $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]"
+                    <input type="text" name="conv_protection_options[label]"
                            value="<?php echo esc_attr( $show_label ); ?>">
                 </td>
             </tr>
             <tr valign="top">
                 <th scope="row">ボタン名</th>
                 <td>
-                    <input type="text" name="_cnv_protect_options[btn]"
+                    <input type="text" name="conv_protection_options[btn]"
                            value="<?php echo esc_attr( $show_btn ); ?>">
                 </td>
             </tr>
diff --git a/template/success.php b/template/success.php
index c91135f..725d1c4 100644
--- a/template/success.php
+++ b/template/success.php
@@ -1 +1,6 @@
+<?php
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+} // Exit if accessed directly
+?>
 <div id="settings_updated" class="updated notice is-dismissible"><p><strong>設定を保存しました</strong></p></div>
diff --git a/uninstall.php b/uninstall.php
index c9dea9c..4e592ac 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('_cnv_protect_options');
\ No newline at end of file
+delete_option('conv_protection_options');
\ No newline at end of file