S-63 Charts PlugIn for OpenCPN 4.x.x

S-63 is the encrypted distribution format for S-57 vector charts. Today, hydrographical offices all over the world are producing their official vector charts in the S-57 format. Distribution is done under the S-63 standard.
To use the encrypted charts, you must get a license for your particular machine (called Permit), make sure to visit http://o-charts.org/ for more information and to get the permits.

http://opencpn.org/ocpn/downloadplugins
Source
https://github.com/bdbcat/s63_pi/