bug 59922: make XSSFPasswordHelper internal because it works on XmlObject objects, which are generally an internal implementation detail of POI-OOXML

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1754785 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/ooxml/java/org/apache/poi/xssf/usermodel/helpers/XSSFPaswordHelper.java b/src/ooxml/java/org/apache/poi/xssf/usermodel/helpers/XSSFPaswordHelper.java
index 39ba2c6..926058f 100644
--- a/src/ooxml/java/org/apache/poi/xssf/usermodel/helpers/XSSFPaswordHelper.java
+++ b/src/ooxml/java/org/apache/poi/xssf/usermodel/helpers/XSSFPaswordHelper.java
@@ -28,9 +28,11 @@
 
 import org.apache.poi.poifs.crypt.CryptoFunctions;
 import org.apache.poi.poifs.crypt.HashAlgorithm;
+import org.apache.poi.util.Internal;
 import org.apache.xmlbeans.XmlCursor;
 import org.apache.xmlbeans.XmlObject;
 
+@Internal(since="3.15 beta 3")
 public class XSSFPaswordHelper {
     /**
      * Sets the XORed or hashed password