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diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/api/io/DataSource.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/api/io/DataSource.java
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+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.pdfas.api.io;
+
+import java.io.InputStream;
+
+/**
+ * Input document data source.
+ * 
+ * <p>
+ * This allows the holder of the data to decide how the data is to be stored (e.g. in a File or in a byte array).
+ * </p>
+ * 
+ * @author wprinz
+ * 
+ */
+public interface DataSource
+{
+  /**
+   * Creates a new InputStream that allows to read out the document's binary
+   * data from the beginning.
+   * 
+   * @return Returns the InputStream with the binary data.
+   */
+  public InputStream createInputStream();
+
+  /**
+   * Returns the length (number of bytes) of the stream.
+   * 
+   * @return Returns the length (number of bytes) of the stream.
+   */
+  public int getLength();
+
+  /**
+   * Returns the data of this DataSource as a byte array for random read only access.
+   * 
+   * <p>
+   * Calling this method indicates that you need a byte array for random
+   * <strong>read only</strong> access. The DataSource implementation should of
+   * course cache this byte array to avoid too much memory usage.
+   * </p>
+   * <p>
+   * Performance analysis has shown that the libraries internally convert the
+   * streams to byte arrays and that file system access is very slow.
+   * </p>
+   * <p>
+   * Never write to this byte array!
+   * </p>
+   * 
+   * @return Returns the data of this DataSource as a byte array for random read only access.
+   */
+  public byte[] getAsByteArray();
+
+  /**
+   * Returns the mime type of the data.
+   * 
+   * @return Returns the mime type of the data.
+   */
+  public String getMimeType();
+
+  /**
+   * Returns the character encoding of the data.
+   * 
+   * <p>
+   * This makes only sense for character based mime types.
+   * </p>
+   * 
+   * @return Returns the character encoding of the data or null if no encoding
+   *         is applicable (e.g. if the data is binary).
+   */
+  public String getCharacterEncoding();
+
+}