gpg and passwords rule

Originally committed as revision 8414 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffmpeg-doc.texi

@@ -1558,6 +1558,10 @@ please use av_log() instead.
     Never write to unallocated memory, never write over the end of arrays,
     always check values read from some untrusted source before using them
     as array index or other risky things.
+@item
+    Developers who have provided a public gpg key shall only receive
+    passwords or other sensitive information related to ffmpeg encrypted
+    with their gpg key or in another secure way
 @item
     Remember to check if you need to bump versions for the specific libav
     parts (libavutil, libavcodec, libavformat) you are changing. You need