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In this video tutorial, Vladislav Mladna and Fabian discuss how to break PDF security, focusing on cryptography in PDF files. The presentation is divided into two parts. The first part addresses digitally signed PDF files, explaining how to recognize them, the verification procedures, and details about the signature validation panel, including information on the signer. The second part centers on PDF encrypted files, outlining how to identify these files. The video aims to provide insights into the security features of PDFs and methods for understanding their cryptographic operations.