A ' user is anyone that is authenticated to for the purpose of:

Designing a form
Digitally signing the form ( needs to know who the user is in order to generate a signature)
Participating in a workflow ( needs to know who the user is in order to display a task list)
Submitting a form that requires authentication to access
Maintaining an audit trail (identifying the submitter, for example)
Using an external security manager (LDAP/Active Directory, for example) with Single Sign On (SSO)

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Anonymous Users

These are users that don't need an account in and also aren't involved in any of the items described above. Anonymous users do NOT count as users and therefore are not limited by the license. Common examples are filling out a survey or a contact form.

Concurrent Users

Concurrent users are users that are logged in to simultaneously.

Generally, for Intranet forms/workflows you want to calculate how many users will concurrently be accessing the forms, since in most cases, on an Intranet, people want to know who is submitting the form. For Extranet forms, you generally do not have authenticated users. For instance, a 10-concurrent user license means 10 users can be logged in simultaneously to .

also offers Unlimited user licenses.