The Protect Worksheet functionality, used to protect sections Mathcad sheets from alterations, is easily bypassed allowing access to the protected data due to the implementation of the file format used to save the files. Versions 12 through 14 are susceptible.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/60152/CVE-2007-4600.txt
Source: https://packetstormsecurity.com/files/60152/CVE-2007-4600.txt.html