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diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/framework/Signator.java b/src/main/java/at/knowcenter/wag/egov/egiz/framework/Signator.java
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+/**
+ * <copyright> Copyright (c) 2006 by Know-Center, Graz, Austria </copyright>
+ * 
+ * This software is the confidential and proprietary information of Know-Center,
+ * Graz, Austria. You shall not disclose such Confidential Information and shall
+ * use it only in accordance with the terms of the license agreement you entered
+ * into with Know-Center.
+ * 
+ * KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
+ * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
+ * NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
+ * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
+ * DERIVATIVES.
+ * 
+ * $Id: Signator.java,v 1.1 2006/08/25 17:07:21 wprinz Exp $
+ */
+package at.knowcenter.wag.egov.egiz.framework;
+
+import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
+import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
+import at.knowcenter.wag.egov.egiz.pdf.IncrementalUpdateInformation;
+import at.knowcenter.wag.egov.egiz.pdf.TablePos;
+
+/**
+ * The basic interface for signator algorithms.
+ * 
+ * @author wprinz
+ */
+public interface Signator
+{
+  /**
+   * This is called before the data is sent to the connector.
+   * 
+   * @param pdf
+   *          The PDF document to be signed.
+   * @param signature_type
+   *          The type/profile of the signature to apply.
+   * @param pos
+   *          The table position. If null, the position is read from the
+   *          profile, if this is null too, the position is computed.
+   * @param has_SIG_ID
+   *          Tells the algorithm, id a SIG_ID field will be required after
+   *          signing. Algorithms with fixed formatted signature blocks need to
+   *          know this.
+   * @return Returns the IncrementalUpdateInformation.
+   * @throws PresentableException
+   *           Forwarded exception.
+   */
+  public IncrementalUpdateInformation prepareSign(byte[] pdf,
+      String signature_type, TablePos pos, boolean has_SIG_ID) throws PresentableException;
+
+  /**
+   * This is called after the data has been signed by the connector.
+   * 
+   * <p>
+   * Replaces all the left out placeholders with their values retrieved from the
+   * signation process.
+   * </p>
+   * 
+   * @param iui
+   *          The IncrementalUpdateInformation.
+   * @throws PDFDocumentException
+   *           Forwarded exception.
+   */
+  public SignResult finishSign(IncrementalUpdateInformation iui) throws PresentableException;
+}