why does my document say its locked?

[Thomas]

When I try to type in any office program, at the bottom it says that the
document is locked and wont type a letter or anything. Why is that?

 

[Me]

When I try to type in any office program, at the bottom it says that the
document is locked and wont type a letter or anything. Why is that?

If it's a trial copy, then the trial period has expired.
If it's a full version, then it might not have been activated.