Step 1: discontinue the public repository, step 2: sell access to your GPL codebase.
The GPL (and even the AGPL) doesn't require you to make your modified source code publicly available (Debian explicitly considers licenses with this requirement non-free). The GPL only states you need to provide your customers with source code.
Step 1: discontinue the public repository, step 2: sell access to your GPL codebase.
The GPL (and even the AGPL) doesn't require you to make your modified source code publicly available (Debian explicitly considers licenses with this requirement non-free). The GPL only states you need to provide your customers with source code.