input: change license to LGPL

cehoyos adds the step_property command in 7a71da01d, and it could be
argued that copyright of this still applies to the later add/cycle
commands (a668ae0ff90c4). While I'm not sure if this is really the case,
stay conservative for now and mark these commands as GPL-only. Mark the
command.c code too, although that is not being relicensed yet.

I'm leaving the MP_CMD_* enum items, as they are obviously different.

In commit 116ca0c7682, "veal" (essentially an anonymous author) adds an
"osd_show_property_text" command (well, the commit message says "based
on" that person's code, so it's not clear how much is from him or from
albeu, who agreed to LGPL). This was later merged again with the
"osd_show_text" command, and then all original code was removed in
commit 58cc0f637f, so I claim that no copyright applies anymore. (Though
technically the input.conf addition still might be copyrighted, so I'm
just dropping it to get rid of the thought.)

"kiriuja" added 2f376d1b39 (sub_load etc.) and be54f4813 (switch_audio).
The latter is gone. I would argue that the former is fully rewritten
with commits b7052b431c9 and 0f155921b0. But like in the step_property
case, I will be overly conservative for now, and mark them as GPL-only,
as this is potentially shaky and should be thought through first. (Not
bothering with the command define/enum in the header, as it will be
unused in LGPL mode anyway.)

keycodes.c/h can be GPL, except for commit 2b1f95dcc2f8, which is a
patch by someone who wasn't asked yet. Before doing something radical, I
will wait for a reply.

6 files changed, 48 insertions, 42 deletions

diff --git a/input/cmd_list.c b/input/cmd_list.c
index 07dd924cbf..4b64dce29b 100644
--- a/input/cmd_list.c
+++ b/input/cmd_list.c
@@ -1,22 +1,24 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <limits.h>
 
+#include "config.h"
+
 #include "common/common.h"
 #include "common/msg.h"
 #include "options/m_option.h"
@@ -100,10 +102,12 @@ const struct mp_cmd_def mp_cmds[] = {
     .allow_auto_repeat = true},
   { MP_CMD_EXPAND_TEXT, "expand-text", { ARG_STRING } },
   { MP_CMD_SHOW_PROGRESS, "show-progress",  .allow_auto_repeat = true},
+#if HAVE_GPL
   { MP_CMD_SUB_ADD, "sub-add", { ARG_STRING,
       OARG_CHOICE(0, ({"select", 0}, {"auto", 1}, {"cached", 2})),
       OARG_STRING(""), OARG_STRING("") } },
   { MP_CMD_SUB_REMOVE, "sub-remove", { OARG_INT(-1) } },
+#endif
   { MP_CMD_SUB_RELOAD, "sub-reload", { OARG_INT(-1) } },
 
   { MP_CMD_TV_LAST_CHANNEL, "tv-last-channel", },
@@ -148,6 +152,7 @@ const struct mp_cmd_def mp_cmds[] = {
   { MP_CMD_RUN, "run", { ARG_STRING, ARG_STRING }, .vararg = true },
 
   { MP_CMD_SET, "set", { ARG_STRING,  ARG_STRING } },
+#if HAVE_GPL
   { MP_CMD_ADD, "add", { ARG_STRING, OARG_DOUBLE(1) },
     .allow_auto_repeat = true,
     .scalable = true,
@@ -159,6 +164,7 @@ const struct mp_cmd_def mp_cmds[] = {
     .allow_auto_repeat = true,
     .scalable = true,
   },
+#endif
   { MP_CMD_MULTIPLY, "multiply", { ARG_STRING, ARG_DOUBLE },
     .allow_auto_repeat = true},
 
diff --git a/input/cmd_list.h b/input/cmd_list.h
index cf881af2bb..5d456c033e 100644
--- a/input/cmd_list.h
+++ b/input/cmd_list.h
@@ -1,18 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef MP_COMMAND_LIST_H
diff --git a/input/cmd_parse.c b/input/cmd_parse.c
index 0af9665cf0..66a7cfe4b0 100644
--- a/input/cmd_parse.c
+++ b/input/cmd_parse.c
@@ -1,18 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stddef.h>
diff --git a/input/cmd_parse.h b/input/cmd_parse.h
index 252dde4fac..295aa3b2e7 100644
--- a/input/cmd_parse.h
+++ b/input/cmd_parse.h
@@ -1,18 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef MP_PARSE_COMMAND_H
diff --git a/input/input.c b/input/input.c
index c859e5e3db..ee58709017 100644
--- a/input/input.c
+++ b/input/input.c
@@ -1,18 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "config.h"
diff --git a/input/input.h b/input/input.h
index c2933e8bd3..ea8460889c 100644
--- a/input/input.h
+++ b/input/input.h
@@ -1,18 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef MPLAYER_INPUT_H