Source for Gammu+ is distributed under dual license:

1. GNU LESSER GENERAL PUBLIC LICENSE 2.1 can be be used by anyone for each (commecional/non commercial) usage. Please note, that this license allows to use this source under GNU GENERAL PUBLIC LICENSE 2 too.
   To clarify: we speak about GNU LESSER GENERAL PUBLIC LICENSE version 2.1 and GNU GENERAL PUBLIC LICENSE version 2 and not about these licenses in other versions.
2. Source written by Marcin Wiącek and received from other developers can be licensed for some concrete projects under commercial license.
   If some of developers don't agree for using their source under it license, should clear tell it. No info means agreement for using this license. Short fixes (few lines - about five or less) for source, which can be distributed under this license, can be distributed under this license. Source, which can't be distributed under this license, will be marked with clear info or disabled from compilation using compiler preprocessor directives set in config file.
   commercial license can be used ONLY AFTER signed paper agreement with Marcin Wiącek. This license is not given for everyone. It's available only for CONCRETE NAMED projects written by CONCRETE PEOPLE/COMPANIES.

Some files in the distribution can't be licensed under LGPL 2.1/commercial license. We speak here about some 3rd' party scripts (which use compiled Gammu+ to make some tasks), some documentation, multimedia files (which of course are not required for compiling software), kernel patches and similar. Each such file contains adequate copying info.

Some source parts can be used under some other than LGPL 2.1/commercial license. Each such part contains adequate copying info.