If you are asking if you can use a snippet of code that was posted on PM in your own work, in most cases the answer is "yes".

This question has come up before, and while there has been much discussion I don't think there is a site policy posted somewhere. Some monks (such as xdg) have included a specific license statement in their signature, but this is the exception rather than the rule.

The following threads may be of interest (I found them using Super Search):

• So sue me
• The Code Catacombs submission page should have a license field.
• Musing on Monastery Content (most of this thread concerns ownership; a sub-thread discussing licensing starts at Re: Musing on Monastery Content)
• Copyright of code on Perlmonks

Update: added one link