| Vol-502 Copyright © 2009 for the individual papers by the papers' authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners. This volume is published by its editors.

# PAN-09
3rd Workshop on
Uncovering Plagiarism, Authorship and Social Software Misuse
and
1st International Competition on Plagiarism Detection

### Proceedings of the SEPLN'09 Workshop on
Uncovering Plagiarism, Authorship and Social Software Misuse
San Sebastian (Donostia), Spain, September 10, 2009.

Preoceedings edited by

### Benno Stein *
Paolo Rosso +
Efstathios Stamatatos #
Moshe Koppel %
Eneko Agirre ~

Competition organized by

### Martin Potthast *
Andreas Eiselt *
Alberto Barrón-Cedeño +
* Bauhaus University Weimar, Faculty of Media / Media Systems, 99423 Weimar, Germany
+ Technical University of Valencia, Dept. of Information Systems and Computation, 46022 Valencia, Spain
# University of the Aegean, Dept. of Information and Communication Systems Engineering, 83200 Karlovassi, Samos, Greece
% Bar-Ilan University, Dept. of Computer Science, 52900 Ramat-Gan, Israel
~ University of the Basque Country, Dept. of Computer Science, 20018 Donostia, Spain

Proceedings in a single PDF file

## Table of Contents

Preface

### Introduction

1. Overview of the 1st International Competition on Plagiarism Detection
   Martin Potthast, Benno Stein, Andreas Eiselt, Alberto Barrón Cedeño, Paolo Rosso, pp. 1-9

### External Plagiarism Detection

2. ENCOPLOT: Pairwise Sequence Matching in Linear Time Applied to Plagiarism Detection
   Cristian Grozea, Christian Gehl, Marius Popescu, pp. 10-18
3. A Plagiarism Detection Procedure in Three Steps: Selection, Matches and "Squares"
   Chiara Basile, Dario Benedetto, Emanuele Caglioti, Giampaolo Cristadoro, Mirko Degli Esposti, pp. 19-23
4. Finding Plagiarism by Evaluating Document Similarities
   Jan Kasprzak, Michal Brandejs, Miroslav Křipač, pp. 24-28
5. Tackling the PAN'09 External Plagiarism Detection Corpus with a Desktop Plagiarism Detector
   James A. Malcolm, Peter C. R. Lane, pp. 29-33
6. Putting Ourselves in SME's Shoes: Automatic Detection of Plagiarism by the WCopyFind Tool
   Enrique Vallés Balaguer, pp. 34-35
7. Using Microsoft SQL Server Platform for Plagiarism Detection
   Vladislav Scherbinin, Sergey Butakov, pp. 36-37

### Intrinsic Plagiarism Detection and Authorship Identification

8. Intrinsic Plagiarism Detection Using Character n-gram Profiles
   Efstathios Stamatatos, pp. 38-46
9. External and Intrinsic Plagiarism Detection using Vector Space Models
   Mario Zechner, Markus Muhr, Roman Kern, Michael Granitzer, pp. 47-55
10. Intrinsic Plagiarism Detection Using Complexity Analysis
    Leanne Seaward, Stan Matwin, pp. 56-61
11. Ordinal Measures in Authorship Identification
    Liviu P. Dinu, Marius Popescu, pp. 62-66
12. "Counter Plagiarism Detection Software" and "Counter Counter Plagiarism Detection" Methods
    Yurii Palkovskii, pp. 67-68

15-Sep-2009: submitted by B. Stein
15-Sep-2009: published on CEUR-WS.org