This is stated in the user guide. Only one image, not multiple at a time, and only Windows sender and receiver. You can disable clipboard and make it so the property cannot be re-enabled.

On the rgsendeconfig file, must have admin privileges to edit, you can change this property to zero if clipboard was installed, feature is installed by default if using standard installation.
## Remote Clipboard
Rgsender.Clipboard.IsEnabled=0
Add this line below the above property:
Rgsender.Clipboard.IsEnabled.IsMutable=0
This will prevent the sender from doing a copy and paste. You can also do this on the receiver side if you want users not being able to use clipboard and it was installed by default.
##### Clipboard properties:
Rgreceiver.Clipboard.IsMutable=0
Rgreceiver.Clipboard.IsEnabled=0
You can also specify what is allowed to be copied and pasted.
## List of clipboard format types allowed to be transferred between Sender
## and Receiver. The property string is a regular expression. Wildcard
## matching (globbing) is not supported.
# Rgreceiver.Clipboard.FilterString=|1|7|8|13|16|17|Ole Private Data|Object Descriptor|Link Source Descriptor|HTML Format|Rich Text Format|XML Spreadsheet|

Kelly
I am an HP employee.