Please consider dual licensing this valuable library?
As I'm sure you are aware, it is very difficult to find anything besides rsync itself that speaks the rsync protocol.
Unfortunately, (as I'm sure you are also aware) the RPL is not particularly compatible with all that many other FOSS licenses. In fact, it is my understanding it is not compatible with the OpenSSL (SSLeay) license, nor the Apache license (due to the patents clauses), and your code has OpenSSL as a dependency.
Now, admittedly, not very many software packages have ever really been compatible with the original OpenSSL license. However, it looks as though the OpenSSL transition to the Apache License is in fact (already, or very nearly) complete!
So, I thought it might not hurt to politely ask if you might possibly be willing to do the same—that is, perhaps do something such as dual license this library (or at least the rsync-related portions) under the RPL and the Apache license?
Thank you, Geoff