License files are encrypted using industry proven algorithms, and with the encryption keyed with a project key and ID. The project key/id used when encoding files must match the project key/id used to generate the corresponding license file in order for the Loader to successfully decrypt the license file when the script is executed.
In Maian Guardian, both values MUST match the values you have entered on the "Advanced" tab of the Source Guardian GUI. It is recommended that project keys & IDs be unique for each product.
Source Guardian Command Line Reference:
--projkey
--projid