Sometimes you want folks to be able to edit documents and entries in SharePpoint but you don't want people to actually delete anything. How do you achieve this? 

Out of the box, giving someone contribute rights means that you are also giving them delete rights. In some cases you will not want to grant them delete rights.

You achieve this by establishing custom permisisons. Rather than me repeating the steps from this very good blog entry - here is the entry.

 

http://blah.winsmarts.com/2007-4-SharePoint_2007__Fine_grained_permission_control.aspx