Answer: The following chart is subject to change.

General Characteristics
	Rental	Basic	Extended
Type of registration key required for activation	Rental	Basic	Extended
How you obtain a registration key	Purchase online	Purchase online	Purchase online
Installed copy will expire	Yes, when the rental period expires	No	No
Installed copy may be renewed before or after expiry date	Yes, via purchase of another Rental registration key	-	-
How is the new expiry date for a renewal calculated?	By adding a new rental period to the current date or existing expiry date, whichever is later	-	-
Activation upgrade to a different edition is available	Yes, via purchase of a New Basic Key or a New Extended Key	Yes, via purchase of a Basic To Extended Key	-
Adhoc reporting is always available	Yes, even after the rental period expires	Yes	Yes
Limitations on the Database Monitor
	Rental	Basic	Extended
Schedules may be used to control when samples are recorded	No	No	Yes
Schedules may be used to control when Alert emails are sent	No	No	Yes
The AutoDrop feature may be used to automatically drop errant connections	No	No	Yes
The DEDICATED_TASK option may be set for Foxhound connections to target databases	No	No	Yes
The Foxhound custom 'ping' process may be run in addition to, and instead of, the Foxhound sample process	No	No	Yes
Maximum number of connections to each target database	100 *	100 *	No limit
Maximum number of physical CPUs used for each target database on a SQL Anywhere Version 10, 11, 12, 16, 17 server	1 **	1 **	No limit
Target database may run on a SQL Anywhere 11.0.1 or later Standard or Advanced Edition server	No ***	No ***	Yes
Maximum number of target databases which may be monitored at the same time by a single copy of Foxhound	10	10	100
Maximum number of different server names which may be used when starting separate instances of Foxhound ****	1 ****	1 ****	Unlimited ****

* This limit on connections applies to all versions and editions of SQL Anywhere target databases and servers. The actual limit is 101 connections when you count the connection from Foxhound itself. Internal connections (e.g., connections made by events and web services) are counted in the total.

** This limit on physical CPUs does not apply to SQL Anywhere version 5.5, 6, 7, 8 or 9 target databases and servers. Also, it applies to the number of physical processors as given by the NumPhysicalProcessorsUsed server property, not the number of logical processors shown by "Using n CPUs" value in the Foxhound Database Monitor. For example, a single Intel Pentium 4 processor counts as 1 physical processor even though the separate HyperThreading units may show up as "Using 2 CPUs". Similarly, a single Intel Core2 Quad processor also counts as only 1 physical processor even though it may show up as "Using 4 CPUs".

*** This restriction on SQL Anywhere editions does not apply to SQL Anywhere target databases and servers earlier than version 11.0.1, which is when SQL Anywhere introduced the notion of different editions.

**** The Rental and Basic Editions allow only one instance of Foxhound to be started on the same local network, and the SQL Anywhere server name must be "foxhound4". The Extended Edition allows an unlimited number of Foxhound instances to be started on the same local network, with no restrictions on the SQL Anywhere server names; however, the License Agreement requires that a separate Extended Edition registration key be purchased for each multiple of 10 instances started.

See also...
How do I get a copy of Foxhound?
What happens when a copy of Foxhound expires?
What is the upgrade policy for installing new builds of Foxhound?
What is the Foxhound End-User License Agreement (EULA)?
Foxhound Extended edition is required for ...
What are the Foxhound system requirements?
How many target databases can one copy of Foxhound monitor?
Help - Introduction - Starting Multiple Copies of Foxhound