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diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/framework/vfilter/VerificationFilter.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/framework/vfilter/VerificationFilter.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.framework.vfilter;
+
+import java.util.List;
+
+import at.gv.egiz.pdfas.exceptions.framework.VerificationFilterException;
+import at.gv.egiz.pdfas.framework.input.PdfDataSource;
+import at.gv.egiz.pdfas.framework.input.TextDataSource;
+
+/**
+ * Extracts all signatures from a given PDF document or text.
+ * 
+ * @see VerificationFilterParameters
+ * 
+ * @author wprinz
+ */
+public interface VerificationFilter
+{
+
+  /**
+   * Extracts the signatures from the given PDF.
+   * 
+   * @param pdf
+   *          The PDF.
+   * @param blocks
+   *          The List of Incremental Update blocks. Usually this comes from a
+   *          preprocessing step.
+   * @param parameters
+   *          The algorithm parameters.
+   * @return Returns a List of SignatureHolders containing the signatures. May
+   *         be empty in case no signatures have been found.
+   * @throws VerificationFilterException
+   *           Thrown if something goes wrong.
+   */
+  public List extractSignatureHolders(PdfDataSource pdf, List blocks, VerificationFilterParameters parameters) throws VerificationFilterException;
+
+  /**
+   * Extracts the text signatures from the given free-text.
+   * 
+   * @param text
+   *          The free-text.
+   * @param parameters
+   *          The algorithm parameters.
+   * @return Returns a List of SignatureHolders containing the signatures. May
+   *         be empty in case no signatures have been found.
+   * @throws VerificationFilterException
+   *           Thrown if something goes wrong.
+   */
+  public List extractSignaturHolders(TextDataSource text, VerificationFilterParameters parameters) throws VerificationFilterException;
+}