What is one purpose of fair use laws? a. to prevent anyone from using copyrighted material b. to give students the right to enhance their education while protecting the creator's rights. c. to allow anyone to use copyright material d. to allow students to use paraphrased material, but not images.

3. bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption (15 points).

Write a program that prompts the user to input a string. the program then uses the function substr to remove all the vowels from the string. for example, if str = "there", then after removing all the vowels, str = "thr". after removing all the vowels, output the string. your program must contain a function to remove all the vowels and a function to determine whether a character is a vowel.

Which operating system is a version of linux?