content server for e‑books and audiobooks with a watermarking module

SETR is a comprehensive solution for companies selling digital content online (e‑books, audiobooks, videos, and others). It’s offered as Software as a Service (SaaS) and covers:


The main benefits of SETR:

  1. Boosting company performance and lowering costs
  2. Very high scalability and efficiency of the solution (quick watermarking of files and delivering them to clients even in increased traffic due to a sale)
  3. Very high reliability of the solution
  4. Secure storage and client access to the purchased content
  5. Watermarking electronic files for every client
  6. The possibility of identifying file owner on the basis of the stamp in a publication found in unauthorized circulation
  7. Easy integration with existing distribution platforms via API


How does it work?

  1. Covering a title with protection
    Every title entered into the system is covered with protection. First, the publication is registered in the system and then the file to be stamped is uploaded to the system.
  2. Stamping
    Each of the copies of a protected title is marked with transaction stamps. This is done immediately before the file is shared with a user. These stamps contain information linking the publication with the buyer, making it possible to identify the file and the date of the transaction. This security measure is very difficult to remove, which makes anonymous sharing of material on a pirate website virtually impossible.


Securing by watermarking means that every purchased copy of an e‑book is marked in such a way that it no longer is an anonymous copy. An e‑book protected with watermarking is assigned to the buyer and cannot be shared anonymously on a pirate website. Watermarking is a security measure designed in a such a way that its removal, even by experts, is actually very time-consuming and virtually impossible.

The watermarking process is automated and takes place “in the background”. From the point of view of an e‑book buyer, there are no additional steps or screens to click through.

The security measures we use are stamps, which are also called watermarks. Stamps are placed in a publication in such a way that, on the one hand, they guarantee clear identification of the files and, on the other hand, do not hinder readers in using legally purchased content.


The stamp technology is based on two types of marks:

  1. Overt (visible), used to stamp materials based on visual communication: PDF files, ePUBs, and video files,
  2. Covert (invisible), used for all digital files that are distributed, and the stamping method is adapted to the type and format of a given file.


The system makes possible: