Need a little help with a pdf file.

I have a CD that came with the Sybex CCNA book. The book is in pdf format, when I copy the pdf file from the CD to my desktop it says that I don't have permission to open the pdf. I can only open it through the CD. Is there a way I can copy that pdf file to my desktop and open it without the CD being in my CD Drive??? I emailed Sybex asking the same question and they told me"No" because the book\CD only has a one user license. I know there must be a way to be able to do this.

Any suggestions???