ePub con DRM... Qué significa?..

Hola compañeros, tengo el siguiente problema con el DRM:

Compré un ebook en el corte inglés y tengo el enlace .acsm
me bajé Adobe Digital Edition y me di de alta obteniendo mi ID en Adobe,
recibí el correo de Adobe confirmando mi alta y solicitando acceder a su página para activarlo.
clic derecho sobre .acsm/abrir con Adobe D.E. y me sale el siguiente cartel:

Archivo adjunto 11322

¿Alguien sabe cómo puedo solucionarlo?

Muchas gracias y un saludo

PD: no tener en cuenta la segunda imagen; intento quitarla pero no puedo.

I think you could probably google that

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