Another angle: sometimes pirate sites upload these PDFs, but accessing them is against the law and not safe. I should warn them about legal and security risks. Instead, suggest legal options even if there's a cost involved. Maybe cheaper alternatives like rentals or used copies. Some platforms like Chegg or Amazon have rental options.
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Algunos portales simulan ser bibliotecas virtuales pero exigen que introduzcas datos de tu tarjeta de crédito o información personal para "verificar tu cuenta", lo que suele derivar en fraudes. Another angle: sometimes pirate sites upload these PDFs,