I am not part of Broadcom staff and will let mwf_mmfae confirm the proper way to handle this question.
I would initially approach the problem like this:
1) Make sure all the team members have an account created on the Broadcom WICED forum.
2) Create a *private* on-line repository that can be accessed only by your team members.
If you use Bitbucket.org you should be able to do what you are looking for with an excellent level of privacy (project shared only between team members). You will get to choose, as administrator, who can get access to the project. There is a login+password needed for each team member before being able to access the repository.
Before doing anything, let's make sure it is in-line with Broadcom policy.