Closed source does not mean that the customer has no access to it.
In case of my Sciter, for example, customers are getting access to SVN server with sources. Some of them are sending patches with fixes and features.
Sciter's [1] core customers are antivirus vendors - highly professional, dedicated and disciplined teams that know very well what they are doing.
It is not an open source but not a closed source either. Rather a professional club where members value each other time and efforts.
[1] https://sciter.com
Closed source does not mean that the customer has no access to it.
In case of my Sciter, for example, customers are getting access to SVN server with sources. Some of them are sending patches with fixes and features.
Sciter's [1] core customers are antivirus vendors - highly professional, dedicated and disciplined teams that know very well what they are doing.
It is not an open source but not a closed source either. Rather a professional club where members value each other time and efforts.
[1] https://sciter.com