Resources resources = getResources(); 
readLicenseFromRawResource(resources);  
...

public void readLicenseFromRawResource(Resources resources) throws NotFoundException, IOException, FileNotFoundException 
 { 
      Copy2Phone(resources, R.raw.xxx, "xxx.jpg");
... 중략
}

public void Copy2Phone(Resources resources, int id, String path) throws IOException
 {
  byte [] buffer = new byte[8*1024];
  int length = 0;
  InputStream is = resources.openRawResource(id);  
  BufferedInputStream bis = new BufferedInputStream(is);    
  FileOutputStream fos = new FileOutputStream("/sdcard/해당 경로명/"); 
  while ((length = bis.read(buffer)) >= 0) fos.write(buffer, 0, length);
  fos.flush();  
  fos.close();  
 }