No, Activiti doesn't have functionality to restrict access to a process for only a specific user. But you can of course easily add this by creating a database table which manages links between process definitions and user/groups.
Thanks for your reply. Happy that my req is possible. But as far now i am using h2 database. When i tried to change the database to sql server in my local it failed with error. I tried based on http://www.activiti.org/userguide/index.html#databaseConfiguration So how to change the datanse for sql server2008? Can u give be exact jdbc settings for sql server? Also how to do it add tables while using h2 database?