--------------------------------------------------------------------------
 The source code of :
     arm_biquad_cascade_df1_fast_q15_M0_fwd_asm.asm
     arm_biquad_cascade_df1_fast_q15_M0_fwd_asm.c

   was tar'd and ciphered to the file :
     src.tar.gz 
 
   This file was ciphered with to a binary file :
     src_biq_m0.otp

   This last file was converted to ASCII text using base64 :
     src_biq_m0.txt
 --------------------------------------------------------------------------
 To recover the binary file from the base64 TXT format you type:
     base64 -d src_biq_m0.txt > src_biq_m0.otp

 To decipher the binary format you need the file "key2.jpg" sent by
     email after payment or contract signature. The command is :
     perl xor_img.pl src_biq_m0.otp key2.jpg src.tar.gz
 
   or using the program XOR (http://firmware-developments.com/WEB/P6x/XOR)
     XOR.exe src_biq_m0.otp key2.jpg src.tar.gz

 Finally the source code is untar'd using the command:
     tar xvfz src.tar.gz
 --------------------------------------------------------------------------