old_contents: import os
  import random
  import string
  
  
  def secure_uuid():
      """
      Strength: 6*3 random characters from a list of 62, approx. 64^18 possible
      strings, or 2^100. Should be enough to prevent a successful bruteforce, as
      download links are only valid for 3 hours
      :return:
      """
      return id_generator() + "-" + id_generator() + "-" + id_generator()
  
  
  def id_generator(size=6, chars=string.ascii_letters + string.digits):
      return ''.join(random.choice(chars) for _ in range(size))
  
  
  def static(*args):
      return os.path.join('static', *args)
  
new_contents: import os
  import string
  from random import SystemRandom
  
  cryptogen = SystemRandom()
  
  
  def secure_uuid():
      """
      Strength: 6*3 random characters from a list of 62, approx. 64^18 possible
      strings, or 2^100. Should be enough to prevent a successful bruteforce, as
      download links are only valid for 3 hours
      :return:
      """
      return id_generator() + "-" + id_generator() + "-" + id_generator()
  
  
  def id_generator(size=6, chars=string.ascii_letters + string.digits):
      return ''.join(cryptogen.choice(chars) for _ in range(size))
  
  
  def static(*args):
      return os.path.join('static', *args)
  
subject: Use SystemRandom to generate security-viable randomness