rtl-sdr for Debian
  -------------------
  
  In the beginning Antti Palosaari noticed that some digital video
  receiver tuners can be turned into a cheap software defined radio.
  
  Since there is also support in the Linux kernel to use these devices
  as digital video receivers, by default the hardware will be claimed
  by Linux keernel drivers for that purpose.
  
  Having these rtl-sdr packages installed likely means that these
  devices should be available for the alternate software defined
  radio use.
  
  The librtlsdr0 package in Debian has configuration files to
  help manage the conflicting uses:
  
  1. Blacklists DVB-T kernel modules provided by the Linux kernel
  -------------------------------------------------------------------
  
  Config file:
  /etc/modprobe.d/librtlsdr-blacklist.conf
  
  contains lines to blacklist dvb_usb_rtl28xxu, e4000 and rtl2832
  kernel modules.
  
  Should you wish to use a device via the Linux video receiver software
  while still having the librtlsdr0 package installed you may edit
  this file. (Placing a # at the beginning os a line makes it a comment.)
  
  Then unplug/plug the USB stick.
  
  Not that if rtl-sdr applications are then run, they will complain about
  failing to open the device. In that case, restore the blacklist and
  unplug/plug the USB stick.
  
  If librtlsdr-blacklist.conf does not exist, then rtl-sdr was built
  with the DETACH_KERNEL_DRIVER option.
  
  2. Permissions
  --------------
  
  Devices are available to users in the plugdev group.
  
  The librtlsdr0 package installs these default rules:
  /lib/udev/rules.d/60-librtlsdr0.rules
  
  If you have permissions issues, you may override these values
  with your own rules in /etc:
  
  /etc/udev/rules.d/60-librtlsdr0.rules
  
  After editing udev rules, run as root: 
   udevadm control --reload-rules