Fotis's employer creates most of their work output as PDF files. Fotis is concerned about limiting the audience for the PDF files to those individuals who have paid for them. What technology can he use to most effectively control the access to and distribution of these files?

Fotis can use digital rights management technology to limit use of the PDFs to paying customers. While DRM is rarely a perfect solution, in this case, it may fit his organization's needs. EDM is electronic dance music, which his customers may appreciate but which won't solve the problem. Encryption and digital signatures can help to keep the files secure and to prove who they came from but won't solve the rights management issue Fotis is tackling.