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The book addresses the "material" that governments deemed too sensitive for the general public, often focusing on files that were supposedly destroyed or kept in restricted archives.

This decision meant that all military personnel were legally and professionally prohibited from discussing or sharing any information related to UFO sightings or investigations. It was a "gag order" that lasted over two decades. By naming his book after this official policy, Benítez directly confronts the root of the secrecy and the culture of silence he spent his career fighting against. The 1992 declassification was supposed to end this, but as Benítez's investigation shows, he considered it merely a new phase of the cover-up.

Benítez often details the relationship between extraterrestrial contact and official concealment.

Spanning over 470 pages, the work includes interviews, photographs, and documentary evidence to support its claims. Reader & Critic Reception Materia Reservada / Eyes Only (Biblioteca J. J. Benítez)

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Accounts from pilots, military personnel, and high-ranking officials.

Legal eBook versions (EPUB/Kindle) are available through major retailers like Amazon and the publisher's official sites such as Planeta de Libros .

Physical copies of Benítez’s older works can be expensive or rare. Digital archiving ensures the information remains accessible to a global audience. Navigating Downloads Safely and Legally

Some of the most popular books in the series include:

The book acts as a critical chronicle of the declassification of UFO files by the Spanish Air Force, which began in the early 1990s. Benítez argues that while some information was released, the most sensitive data remained hidden.