Clarify licence situation

2 files changed, 28 insertions, 4 deletions

diff --git a/README.md b/README.md
index a962c2a..2016146 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 FDK-AAC-DABplus Package
 =======================
 
-This package contains an DAB+ encoder that uses the standalone library
+This package contains an DAB+ encoder that uses a modified library
 of the Fraunhofer FDK AAC code from Android, patched for
 960-transform to do DAB+ broadcast encoding.
 
@@ -248,3 +248,25 @@ v0.7.0 fixes most issues, and PAD now works much more reliably.
 Version 0.4.0 of the encoder changed the ZeroMQ framing. It will only work with
 ODR-DabMux v0.7.0 and later.
 
+LICENCE
+=======
+
+It's complicated. The FDK-AAC-DABplus project contains
+
+ - The Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for
+   Android, which is under its own licence. See NOTICE.
+ - The code for dabplus-enc in src/ licensed under the Apache Licence v2.0. See
+   http://www.apache.org/licenses/LICENSE-2.0
+ - libtoolame-dab, derived from TooLAME, licensed under LGPL v2.1 or later. See
+   libtoolame-dab/LGPL.txt
+
+These source files are compiled and linked together into the dabplus-enc encoder.
+
+In addition to the audio encoder, there is also mot-encoder, containing code
+
+ - in src/ that is GPL v3+ licensed
+ - and a crc library with unclear licence situation in contrib/
+
+Whether it is legal or not to distribute compiled binaries from these sources
+is unclear to me. Please seek legal advice to answer this question.
+
diff --git a/src/dabplus-enc.cpp b/src/dabplus-enc.cpp
index 2a1df77..b865a61 100644
--- a/src/dabplus-enc.cpp
+++ b/src/dabplus-enc.cpp
@@ -59,9 +59,11 @@ using namespace std;
 
 void usage(const char* name) {
     fprintf(stderr,
-    "dabplus-enc %s is a HE-AACv2 encoder for DAB+\n"
-    "based on fdk-aac-dabplus and a Toolame-based MPEG\n"
-    "encoder for DAB that can read from JACK, ALSA or\n"
+    "dabplus-enc %s is an audio encoder for both DAB and DAB+.\n"
+    "The DAB+ HE-AACv2 encoder is based on a Thirt-Party Modified\n"
+    "Version of the Fraunhofer FDK AAC Codec Library for Android,\n"
+    "and the DAB encoder is using the tooLAME MPEG\n"
+    "encoder sources. The encoder can read from JACK, ALSA or\n"
     "a file source and encode to a ZeroMQ output for ODR-DabMux.\n"
     "(Experimental!)It can also use libvlc as an input.\n"
     "\n"