diff --git a/.gitignore b/.gitignore
old mode 100755
new mode 100644
diff --git a/LICENSE b/LICENSE
old mode 100755
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diff --git a/Makefile b/Makefile
old mode 100755
new mode 100644
diff --git a/Makefile.dirs b/Makefile.dirs
old mode 100755
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diff --git a/Makefile.dspl b/Makefile.dspl
old mode 100755
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diff --git a/Makefile.test b/Makefile.test
old mode 100755
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diff --git a/Makefile.verif b/Makefile.verif
old mode 100755
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diff --git a/README.md b/README.md
old mode 100755
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diff --git a/dox/doxy_stylesheet.css b/dox/doxy_stylesheet.css
old mode 100755
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diff --git a/dox/doxyfile_ru b/dox/doxyfile_ru
old mode 100755
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diff --git a/dox/doxygen_style.css b/dox/doxygen_style.css
old mode 100755
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diff --git a/dox/footer.html b/dox/footer.html
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diff --git a/dox/header.html b/dox/header.html
old mode 100755
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diff --git a/dox/makedoc.sh b/dox/makedoc.sh
old mode 100755
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diff --git a/dox/ru/error_list.dox b/dox/ru/error_list.dox
old mode 100755
new mode 100644
diff --git a/dox/ru/getting_started_mingw.dox b/dox/ru/getting_started_mingw.dox
old mode 100755
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diff --git a/dox/ru/groups_define.dox b/dox/ru/groups_define.dox
old mode 100755
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diff --git a/dox/ru/img/compileproc.png b/dox/ru/img/compileproc.png
old mode 100755
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diff --git a/dox/ru/img/dspl_dir.png b/dox/ru/img/dspl_dir.png
old mode 100755
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diff --git a/dox/ru/img/dspl_exe.png b/dox/ru/img/dspl_exe.png
old mode 100755
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diff --git a/dox/ru/img/dspl_github.png b/dox/ru/img/dspl_github.png
old mode 100755
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diff --git a/dox/ru/img/far_manager.png b/dox/ru/img/far_manager.png
old mode 100755
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diff --git a/dox/ru/img/gcc_ver.png b/dox/ru/img/gcc_ver.png
old mode 100755
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diff --git a/dox/ru/img/gnuplot.png b/dox/ru/img/gnuplot.png
old mode 100755
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diff --git a/dox/ru/img/mingw_bin.png b/dox/ru/img/mingw_bin.png
old mode 100755
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diff --git a/dox/ru/img/path_1.png b/dox/ru/img/path_1.png
old mode 100755
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diff --git a/dox/ru/img/path_2.png b/dox/ru/img/path_2.png
old mode 100755
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diff --git a/dox/ru/img/path_3.png b/dox/ru/img/path_3.png
old mode 100755
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diff --git a/dox/ru/img/path_gnuplot.png b/dox/ru/img/path_gnuplot.png
old mode 100755
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diff --git a/dox/ru/img/path_old.png b/dox/ru/img/path_old.png
old mode 100755
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diff --git a/dox/ru/img/path_unx.png b/dox/ru/img/path_unx.png
old mode 100755
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diff --git a/dox/ru/img/unxutils.png b/dox/ru/img/unxutils.png
old mode 100755
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diff --git a/dox/ru/img/vs_build.png b/dox/ru/img/vs_build.png
old mode 100755
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diff --git a/dox/ru/img/vs_build_success.png b/dox/ru/img/vs_build_success.png
old mode 100755
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diff --git a/dox/ru/img/vs_output.png b/dox/ru/img/vs_output.png
old mode 100755
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diff --git a/dox/ru/img/vs_path.png b/dox/ru/img/vs_path.png
old mode 100755
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diff --git a/dox/ru/img/vs_run.png b/dox/ru/img/vs_run.png
old mode 100755
new mode 100644
diff --git a/dox/ru/mainpage.dox b/dox/ru/mainpage.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/complex.dox b/dspl/dox/ru/complex.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/conv.dox b/dspl/dox/ru/conv.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/dft.dox b/dspl/dox/ru/dft.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/ellipj.dox b/dspl/dox/ru/ellipj.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/fft.dox b/dspl/dox/ru/fft.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/fillarray.dox b/dspl/dox/ru/fillarray.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/filter_an.dox b/dspl/dox/ru/filter_an.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/filter_ap.dox b/dspl/dox/ru/filter_ap.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/filter_ft.dox b/dspl/dox/ru/filter_ft.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/fourier_series.dox b/dspl/dox/ru/fourier_series.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/goertzel.dox b/dspl/dox/ru/goertzel.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/inout.dox b/dspl/dox/ru/inout.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/math.dox b/dspl/dox/ru/math.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/matrix.dox b/dspl/dox/ru/matrix.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/polyval.dox b/dspl/dox/ru/polyval.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/randgen.dox b/dspl/dox/ru/randgen.dox
old mode 100755
new mode 100644
diff --git a/dspl/dox/ru/resampling.dox b/dspl/dox/ru/resampling.dox
old mode 100755
new mode 100644
diff --git a/dspl/obj/.gitignore b/dspl/obj/.gitignore
old mode 100755
new mode 100644
diff --git a/dspl/src/array.c b/dspl/src/array.c
old mode 100755
new mode 100644
index cb177f9..25bff5a
--- a/dspl/src/array.c
+++ b/dspl/src/array.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/cheby.c b/dspl/src/cheby.c
old mode 100755
new mode 100644
index 8f9330e..1bfa859
--- a/dspl/src/cheby.c
+++ b/dspl/src/cheby.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/complex.c b/dspl/src/complex.c
old mode 100755
new mode 100644
index ddcfef9..7413cb7
--- a/dspl/src/complex.c
+++ b/dspl/src/complex.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2017 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of DSPL.
diff --git a/dspl/src/conv.c b/dspl/src/conv.c
old mode 100755
new mode 100644
index 6c92803..57e247d
--- a/dspl/src/conv.c
+++ b/dspl/src/conv.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/dft.c b/dspl/src/dft.c
old mode 100755
new mode 100644
index 380ad00..457907b
--- a/dspl/src/dft.c
+++ b/dspl/src/dft.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/dspl_internal.h b/dspl/src/dspl_internal.h
old mode 100755
new mode 100644
index eb4db5b..2a87bb8
--- a/dspl/src/dspl_internal.h
+++ b/dspl/src/dspl_internal.h
@@ -1,3 +1,23 @@
+/*
+* Copyright (c) 2015-2019 Sergey Bakhurin
+* Digital Signal Processing Library [http://dsplib.org]
+*
+* This file is part of libdspl-2.0.
+*
+* 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 3 of the License, or
+* (at your option) any later version.
+*
+* DSPL 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.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef DSPL_INTERNAL_H
 #define DSPL_INTERNAL_H
 
diff --git a/dspl/src/ellipj.c b/dspl/src/ellipj.c
old mode 100755
new mode 100644
index 91be584..a24212f
--- a/dspl/src/ellipj.c
+++ b/dspl/src/ellipj.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of DSPL.
diff --git a/dspl/src/fft.c b/dspl/src/fft.c
old mode 100755
new mode 100644
index 5730656..5a2e0c5
--- a/dspl/src/fft.c
+++ b/dspl/src/fft.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
@@ -135,7 +135,7 @@ label_size:
       RE(t1[k]) = IM(t1[k]) = 0.0;
       for(m = 0; m < n; m++)
       {
-        i = addr + ((k*m) % n);
+        i = (k*m) % n;
         RE(tmp) = CMRE(t0[m], pw[i]);
         IM(tmp) = CMIM(t0[m], pw[i]);
         RE(t1[k]) += RE(tmp);
@@ -246,6 +246,7 @@ label_size:
         IM(pfft->w[addr]) = sin(phi);
         addr++;
       }
+	  s = 1;
     }
     else
     {
diff --git a/dspl/src/fft_subkernel.c b/dspl/src/fft_subkernel.c
old mode 100755
new mode 100644
index 1bd9126..b04bf1a
--- a/dspl/src/fft_subkernel.c
+++ b/dspl/src/fft_subkernel.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/fillarray.c b/dspl/src/fillarray.c
old mode 100755
new mode 100644
index 496466c..51a598a
--- a/dspl/src/fillarray.c
+++ b/dspl/src/fillarray.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/filter_an.c b/dspl/src/filter_an.c
old mode 100755
new mode 100644
index 93b8711..6781598
--- a/dspl/src/filter_an.c
+++ b/dspl/src/filter_an.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/filter_ap.c b/dspl/src/filter_ap.c
old mode 100755
new mode 100644
index 79dc8ba..1b8223e
--- a/dspl/src/filter_ap.c
+++ b/dspl/src/filter_ap.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/filter_ft.c b/dspl/src/filter_ft.c
old mode 100755
new mode 100644
index 1a36486..01d888a
--- a/dspl/src/filter_ft.c
+++ b/dspl/src/filter_ft.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2018 Sergey Bakhurin
+ * Copyright (c) 2015-2019 Sergey Bakhurin
  * Digital Signal Processing Library [http://dsplib.org]
  *
  * This file is part of libdspl-2.0.
diff --git a/dspl/src/fourier_series.c b/dspl/src/fourier_series.c
old mode 100755
new mode 100644
index 994cd57..8e4efe9
--- a/dspl/src/fourier_series.c
+++ b/dspl/src/fourier_series.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/goertzel.c b/dspl/src/goertzel.c
old mode 100755
new mode 100644
index 1df809f..fd68c5b
--- a/dspl/src/goertzel.c
+++ b/dspl/src/goertzel.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/inout.c b/dspl/src/inout.c
old mode 100755
new mode 100644
index a037dff..a999f39
--- a/dspl/src/inout.c
+++ b/dspl/src/inout.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of DSPL.
diff --git a/dspl/src/math.c b/dspl/src/math.c
old mode 100755
new mode 100644
index 2ae3cf0..e319ada
--- a/dspl/src/math.c
+++ b/dspl/src/math.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2017 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of DSPL.
diff --git a/dspl/src/matrix.c b/dspl/src/matrix.c
old mode 100755
new mode 100644
index 4c76aa4..affce68
--- a/dspl/src/matrix.c
+++ b/dspl/src/matrix.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/polyval.c b/dspl/src/polyval.c
old mode 100755
new mode 100644
index d1d00a8..ec39c49
--- a/dspl/src/polyval.c
+++ b/dspl/src/polyval.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/randgen.c b/dspl/src/randgen.c
old mode 100755
new mode 100644
index 16a8318..be00189
--- a/dspl/src/randgen.c
+++ b/dspl/src/randgen.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/resampling.c b/dspl/src/resampling.c
old mode 100755
new mode 100644
index 45ab332..890ce3f
--- a/dspl/src/resampling.c
+++ b/dspl/src/resampling.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/signals.c b/dspl/src/signals.c
old mode 100755
new mode 100644
index 0072b1b..c9822e5
--- a/dspl/src/signals.c
+++ b/dspl/src/signals.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/dspl/src/trapint.c b/dspl/src/trapint.c
old mode 100755
new mode 100644
index c9b6107..5079e05
--- a/dspl/src/trapint.c
+++ b/dspl/src/trapint.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2017 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of DSPL.
diff --git a/ide/visualstudio/libdspl-2.0.sln b/ide/visualstudio/libdspl-2.0.sln
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/libdspl-2.0.vcxproj b/ide/visualstudio/libdspl-2.0.vcxproj
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/libdspl-2.0.vcxproj.filters b/ide/visualstudio/libdspl-2.0.vcxproj.filters
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/libdspl-2.0.vcxproj.user b/ide/visualstudio/libdspl-2.0.vcxproj.user
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/test.vcxproj b/ide/visualstudio/test.vcxproj
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/test.vcxproj.filters b/ide/visualstudio/test.vcxproj.filters
old mode 100755
new mode 100644
diff --git a/ide/visualstudio/test.vcxproj.user b/ide/visualstudio/test.vcxproj.user
old mode 100755
new mode 100644
diff --git a/include/dspl.c b/include/dspl.c
old mode 100755
new mode 100644
index a6cec62..912ab8c
--- a/include/dspl.c
+++ b/include/dspl.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/include/dspl.h b/include/dspl.h
old mode 100755
new mode 100644
index 9df7c22..aa346d6
--- a/include/dspl.h
+++ b/include/dspl.h
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/release/doc/.gitignore b/release/doc/.gitignore
old mode 100755
new mode 100644
diff --git a/release/doc/ru/.gitignore b/release/doc/ru/.gitignore
old mode 100755
new mode 100644
diff --git a/release/include/dspl.c b/release/include/dspl.c
old mode 100755
new mode 100644
index a6cec62..912ab8c
--- a/release/include/dspl.c
+++ b/release/include/dspl.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/release/include/dspl.h b/release/include/dspl.h
old mode 100755
new mode 100644
index 9df7c22..aa346d6
--- a/release/include/dspl.h
+++ b/release/include/dspl.h
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015-2018 Sergey Bakhurin
+* Copyright (c) 2015-2019 Sergey Bakhurin
 * Digital Signal Processing Library [http://dsplib.org]
 *
 * This file is part of libdspl-2.0.
diff --git a/release/lib/.gitignore b/release/lib/.gitignore
old mode 100755
new mode 100644
diff --git a/test/bin/.gitignore b/test/bin/.gitignore
old mode 100755
new mode 100644
diff --git a/test/bin/dat/.gitignore b/test/bin/dat/.gitignore
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/butter_ap_test.plt b/test/bin/gnuplot/butter_ap_test.plt
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/cheby1_ap_test.plt b/test/bin/gnuplot/cheby1_ap_test.plt
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/fourier_series_pimp.plt b/test/bin/gnuplot/fourier_series_pimp.plt
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/fourier_series_rec.plt b/test/bin/gnuplot/fourier_series_rec.plt
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/fourier_transform_ex_gauss.plt b/test/bin/gnuplot/fourier_transform_ex_gauss.plt
old mode 100755
new mode 100644
diff --git a/test/bin/gnuplot/sinc_test.plt b/test/bin/gnuplot/sinc_test.plt
old mode 100755
new mode 100644
diff --git a/test/bin/img/.gitignore b/test/bin/img/.gitignore
old mode 100755
new mode 100644
diff --git a/test/dox/ru/dft_indexation.dox b/test/dox/ru/dft_indexation.dox
old mode 100755
new mode 100644
diff --git a/test/dox/ru/filter_approx.dox b/test/dox/ru/filter_approx.dox
old mode 100755
new mode 100644
diff --git a/test/dox/ru/fourier_series_pimp_spectrum.dox b/test/dox/ru/fourier_series_pimp_spectrum.dox
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