Does anyone know what is the licensing cost of CMIS and How many repositories it can support?
There is no additional licensing cost for CMIS. It is included with Content Server.
If your question about the number of repositories is related to licensing, then there is no limitation. If you're building a custom application or using a 3rd party application to access Documentum via CMIS, you will need to acquire a Custom Client named user license for each user of the application.
