how to choose client access licenses in jazz server setup?

@ all : thanks alot for your reply , it was very helpful ,

so in conclusion  :

- RTC is enough for version control , assign tasks , tracking issues ...trying it will clarify this point .

- starting will be by trial license , 60 days trial then shall i purchase RTC license 10 developers or  is it free ?, if free where could i get it ???(i got the source of RTC client and server from IBM academic initiative)

- updating license from trial to permenant or add new license exist using jts/admin interface.

For source control, assigning tasks or similar activities, the RTC developer should be enough. Why don't you give it a try to see if it fits your needs? For your 10 developers, the 10-free RTC developer CAL should be enough. You can also use a trial developer license for 60 days and see if that is enough for you.
Accessing the /jts/admin interface from your browser allows you to add/update licenses, in the Server tab, License Key Management section.

 Hi Mai,  I agree with Arun's comment above.  It's also possible to add new licenses as needed over time by visiting the JTS/admin > server > License Key Management page.  

I am still a bit of a newbie myself, but I know that you can add licenses after set-up, see Manual Pages - Licences.

The ones you are looking at in the Express setup are probably the demo licenses that will need to be replaced with permenant onces before they expire in 60 days. After that you will be limited to the license types that you have purchased.

Ali