For those wanting to try before they buy, the publisher's website (Productions d'Oz) and the forum users have noted that "little previews of the pieces in pdf or jpeg" are often available on the official site. This is a legitimate way to see a page or two of a piece to gauge its difficulty and style before purchasing the full PDF.
Here are the direct, legitimate ways to obtain the sheet music as a PDF: les 100 de roland dyens pdf link
While the temptation to find a quick PDF link is understandable, do yourself and the music community a favor: buy the book. You will have a lifetime of music at your fingertips, and you will be honoring the memory of one of the guitar’s greatest modern masters. For those wanting to try before they buy,