 His extensive research confirmed that van Meegeren started to make forgeries, not so much by feeling misunderstood and undervalued by art critics as for the income that it generated, income which he needed to support his addictions and promiscuity.Lopez confirmed the veracity of Jan Spierdijk's article in "De Waarheid" in which Spierdijk reported that the book "Tekeningen 1" by van Meegeren was in Hitler's library, signed by the artist and dedicated to the Führer.Van Meegeren continued to paint after he was released from prison, signing his works with his own name.