For those that are building databases and are looking for suitable licenses to protect this, you might want to consider using the latest Creative Commons license (v4) that has been released recently. Although I am not an expert, I guess this is useful when publishing your own collection of samples, annotations, etc
These rights mostly apply to databases created in the EU, but f.e. also Korea and Mexico:
http://wiki.creativecommons.org/4.0/Sui_generis_database_rightshttp://creativecommons.org/Version4