license: add preliminary license

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+Right now, the exact LICENSE to be used for enigma2 is undecided.
+
+enigma2 will be licensed with a proprietary, not-yet decided license.
+
+This proprietary license will not allow you to compile, modify or do
+anything with this sources. You are allowed, however, to distribute
+an unmodified version of the sources, including all license statements.
+
+The proprietary license will essentially allow you one thing:
+
+You are free to take *THIS* version of enigma2, and derive a version 
+which will be licensed under the GPLv2. If you're doing this,
+be sure to insert proper licencening statements to ensure that it
+doesn't get mixed up with the proprietary version.
+
+The derived version can be, of course, modified, distributed etc. in
+modified forms, however, you have to publish all changes you made in
+source form if you are distributing a binary version. Exact details
+can be read in the GPLv2.
+
+If you wish do send us patches to be included in the "official 
+release", which will be based on the proprietary license, you have to
+agree that your code will be licensed under the proprietary license.
+
+Note that "official release" just means the version which is shipped
+with the Dreambox hardware.
+
+You are, of course, free to make patches to a GPL-only version. These
+changes won't show up in the "official release" then, though.
+
+The same goes for plugins. You can decide wheter you want your plugins
+to be compatible to the "official release" (so you must explicitely
+allow "linking" code licensed under the proprietary license to your
+code), or you can decide that your code should be only linked to
+the GPL'ed ("free") version of enigma2.