+%The notebooks shall contain a full write-up of your approach, including all details necessary to reproduce your results.
+
+
+Due to the increasing ease of plagiarism the plagiarism detection has nowadays become a need for many institutions.
+Especially for universities where modern learning methods include e-learning and a vast document sources are online available.
+%In the Information System of Masaryk University~\cite{ismu} there is also an antiplagiarism tool which is based upon the same principles as are shown in this paper.
+The core methods for automatic plagiarism detection, which also work in practice on extensive collections of documents,
+are based on computation document similarities. In order to compute a similarity
+we need to possess the original and the plagiarized document.
+%The most straightforward method is to use an online search engine in order to enrich
+%document base with potential plagiarized documents and evaluate the amount of plagiarism by detailed document comparison.
+%In this paper we introduce a method which has been used in PAN 2012 competition\footnote{\url{http://pan.webis.de/}}
+%in plagiarism detection.
+
+In the first section we will introduce methods for candidate document retrieval from online sources, which took part in
+PAN 2012 competition\footnote{\url{http://pan.webis.de/}} in plagiarism detection.
+The task was to retrieve a set of candidate source documents that may had served as an original to plagiarize from.
+In the PAN 2012 candidate document retrieval test corpus, there were 32 text documents all contained at least one plagiarism case.
+The documents were approximately 30 KB of size, the smallest were 18 KB and the largest were 44 KB.
+
+In the second section we describe our approach of detailed document comparison.
+We highlight the differences of this approach to the one we used for PAN 2010
+competition. We then provide the outline of the algorithm, and describe
+its steps in detail. We briefly mention the approaches we explored,
+but did not use in the final submission. Finally, we discuss the performance
+of our system (both in terms of the plagdet score, and in terms of CPU time).