There is such a way to do so. You will need to acquire a code signing certificate to encrypt the deployment package. On the development machine you will install this code signing certificate with private key on to the development machine.
After the code signing certificate has been installed and you are ready to deploy the package, you will need to sign the deployment package with the use of the Project Deployment Signing Certificate browser.
Navigate to the code signing certificate that was installed earlier to sign the package.
On the Runtime machine, you will need to install the same code signing certificate without private key (public key only). After installing the code signing certificate with public key, you will need to adjust the user's (%appdata%/openspan) runtimeconfig.xml to indicate that the package downloaded requires a signing certificate in the security section of the runtimeconfig.xml
Below is a link that goes into detail of the security settings for the runtimeconfig.xml. The information can be found under the DeploymentSecurity section.