Is it possible to open a locked PowerPoint. I would like to use some of the graphics.
As Oron and Alan have indicated, if you know it's OK to use the material within a PowerPoint presentation, give the info in this article a shot:
I can't speak for the authenticity of the material within the link. But it's relatively straightforward: more or less, if you want to get through a PowerPoint password you would use a program that effectively guesses the correct combination of numbers, letters and symbols. There are many kinds of approaches to this concept, which range from "brute force" to "rainbow" algorithms. A brute force algorithm simply applies a linear approach whereas a rainbow uses (for example) commonly used passwords.
Depending on how it was "locked", it is sometimes possible to open the presentation in a different program, such as LibreOffice or GoogleDocs.
That said, Alan Wade makes a good point. Do take the original author's intentions into account!
By locked do you mean password protected?
It will no doubt, be protected for the very same reason as you would like it unprotected - to stop people copying the material within it. On top of that you need to think whether the author has the material copywrited or not.
Maybe a few more details will help.....