...
- Individual users
- Groups (including 'Anyone' group (e.g. to allow anonymous access)Any logged in user' and 'Anonymous')
- Project roles
- Issue roles such as the 'Reporter', 'Project Lead' and 'Current Assignee'
- JIRA Permissions inherited from JIRA Permission Schemes
- A (multi-)user picker custom field.
- A (multi-)group picker custom field. This can either be an actual group picker custom field, or a (multi-)select-list whose values are group names.
...