Package: pyhcrypt
pyhcryptA simple and secure password-based encryption & decryption algorithm based on hash functions, implemented solely based on python.UsageInstall withpip install pyhcrypt.PythonMain APIencrypt(input, password, use_rand=True)Encryptinput(eitherbytesor an openedfile object) withpassword(eitherbytesorstr), return the encrypted result (bytes). Ifinputis an openedfile object, this function behaves as a generator and encrypts in a 64 bytes by 64 bytes manner to be memory friendly.Ifuse_randis set toTrue(default), 64 random bytes will be encrypted before processinginput, and the encryption result is also 64 bytes longer thaninput. This helps protect thepassword, especially for cases when theinputstarts with a specific pattern.decrypt(input, passwd, use_rand=True)Decryptinput(eitherbytesor an openedfile object) withpassword(eitherbytesorstr), return the decryption result (bytes).use_randshall be consistent with the setting ofencrypt.ExampleEncrypt and decrypt bytes.from pyhcrypt import encrypt, decrypt
from os import urandom

bytes_ori = urandom(64)
passwd = "a_password"

bytes_enc = encrypt(bytes_ori, passwd)
bytes_dec = decrypt(bytes_enc, passwd)

print(bytes_ori == bytes_dec)Encrypt or decrypt a file.from pyhcrypt import encrypt, decrypt

def handle(cmd, passwd, srcf, rsf):

	func = decrypt if cmd.find("d") >= 0 else encrypt
	with open(srcf, "rb") as rf, open(rsf, "wb") as wf:
		for _ in func(rf, passwd):
			wf.write(_)Command Line InterfaceExecute eitherpython -m pyhcrypt action password input_file output_fileorpyhcrypt action password input_file output_filewhereactioncan be eithere(for encryption) ord(for decryption),passwordis the password,input_fileandoutput_fileare the corresponding input and output file respectively.-for standard input/output.PerformanceTest with CPython 3.10.4, using a single Intel Core M3-7Y30 CPU thread. Even though python is slower than C, this library still achieves encryption/decryption speeds of 31.3 MB/s.A puzzleWe encrypt a UTF-8 encoded message with theencryptfunction for 16 individual times with the below code.from gzip import compress
from pyhcrypt import encrypt

def puzzle(msg, n):

	gz_msg = compress(msg)
	for i in range(n):
		print(encrypt(gz_msg, msg, use_rand=True))Following are the encryption results.b'\xdaz>\x9b\xf2s\x84\x08\xc5O\xa7\xe28{\xbe|\xc4\xd77\xac\x98\x96\xb7\xb9\xf8\xcc@\x94\x1b\x06\xbb\xae\x84\xbc\x9e\xcaN\xd6\xc4\xc9\xca\x07 \xa2\xca4\xa4\xf82\xa4*q\x114\xbcW\xe6\x10\xd6\xf8/H\xc0t\xfb\x1d3\xa2\x9d\xa9H\n\xbf\xf8\x90{\x0f\xf3/b|\xe9\x9b\x95\xbd\xb2\x11Ri$)7\xb4\xd8\xdc\x0e+\x9fL<\x1cH\xb4\x01;\x03\xfb{\x1bj\x00gC\xd3\x91\xb4\xd4M\x85\xc72P\x9aI\x86\tlV\xd7\x0e["\xea\xef\xfb\xe5\x8fl 8s\xbc\xf5\xdc?k9\xdd\x96\xe7\xa9QE,6\xfa\x1d\x06\\g(\xa7\x1ew\xddv\xa06\xb6\xf3\xf3\xf2\xbb\x9a@\x0c\x0c\xe9\xaf\xb1;\xed'
b'\xb9C\xca""\x15\x94\xbb\x80\xb0\xc0\xb3\x04h\x1au\xbe?\x16)\x883;\xb8\xa8h\xf2u\xc4\x8a\xd6\x94@\n\xd0Z\xedPu\x045\x87\x91\x9eO\x8c\xb7\xf3O9\xdcW\xeay\x84d\x91v\xeb\x99\xea\x10f\xcd\xc7 k\x91\x8a\xaf)\xe6\xb5\xdd\xf8r76\x9fb\x1d\x8c\x0c\xf6\xc7\x19p\xa1i\x03NA=\xd2&\xff>1a\xf6\x18Wx>p\xf4\xf06=L\xadg\xb5\xfe\x08T,c6]\xf0\x8er_-\x92\x0e\x964\xa1\xf8b\xee\x04\xe4\xf6\xafHM\xf5(-L{K\xa0E\xd9\x87EN\xf3,e\x05\x82E\xe2\xd7p\x08\xabS;U\xfa\xb0\xdd9\x0c\x86D\xb3\xec_\xec\xe1\x15pj.\xe9'
b"x\x8e\x9f\x91\\\x0b\xf2\xc4G,\xe4\x073\x8e\xa3 _\xf0\x87W\xb7R\x19\xe6f\xb9d\xf2\xac\xe4N\\&\x02\x8e$\x1dZ@\xcf\xcb\xe7\xccd\xe8\xcb\x88\x10\xd5v\x08\xa2/\xd2\xf5y\x18_Sz)\xdc>^NM\x92'd\x1c\xb8\xa3|\x00e\xa5\x1fe\xf5\xef,!\xaf2+\xc1\xfcL\xd7_\xd2/\x93\xa3@3|\x0c\xa1\xec\xde\xae\x18\xefY\xabcF\xb9z4 \xba\xf3\x10/\x8f\x85\x04\x18*\x9ay\xb0\xa4\x1e\x96P~[\xc6\xd7\x864\xbf\xdf\xbb\xd4g\x88w\xcd\xf6\x9b\xa4c\x98*E\x9a@\x11\x84p\x1f\x9f\xfb<^g7v\x9c\xd96\x0e\xf6J\x01\x93Ou\xb8\t\x15\xcd\xe9\xed<\x99y\xdc"
b'\x9f\x14\xebRn\xdb\xfe\x8b@(\xdf\x1e&\xada\x80\x91\xba\xa3+\xb7g\x8b!\xe0$\xe3\xd3\xa2\x12c6\x04h\xd6\x03\x83\x89\xb0\xf5;(\xddz\xe5\xfeR\xaf,\xb40\xc8\\TX!(\xd9\x92\xc0\xa0\x9dW\'3\x19n-;\x1c\xdb\xee\x0e\xe3\xb0\x91L9\xbd\x1e\xef\xe9\xb3\xc5\xb6+\xf1\xd26&\xceK\xaa\xa4l\x9e^\xb3!\x0f\x91N,\xb0\x11b"\x85\xc0\xd3\x136xU\x8c\'X\xc5+\xef\xb0~\xc0\xc1\xa3\xe1g/\xb7q\x99M?\x9d\xe0p\xfe\x85\x13\x9e4\x84\xca-\x81\xa4\xd9^\x1a\xfb\xa1\xaa\\\x05z\xc9\x0b\x98\xe1\xfdi\x88\x8fu\xef\xea\xf5\xef\x8f\xf7\xf5bf\x9f\x14\x98r\x8f\xe0\xa4P\xe8'
b"vA\x8f\xf9m8\xa8;\x8bn\xaa\x03\xd6h\xe2\xc5\xd2\xf7\x8dt)J\x80\x1bq\xc2GC\xdfa\xdf\x81\xea\xc5'\xdfU\xf7i\x1f:-b \xc6\x1d\xf5X\x9a\xe7\xa1\xf0\xb8\x10\xd0\xe8e\xda\x9aJ[\x01x\x06\xd3F\xb5\n\xca\xf7\x85uV\xb1*(\xf1\x04B\x14\x0c\xa5\xe3\x1e\x0ek\xbf\xee\x03K\xf7Z\x93\x84\xa5\x05\xd0\xd89\x8e\x18K\x01X\x8b\x8f\xf3f\xad\xb6\xaf\xf9O\x7f\x91\x8f@\xd6!\xd2&J\x01\x00h\xe7\xe7\xf2\x8dS\xa6|\x01_s5X\xb5\xa0\t\xfa<\xb4\xf9\xac\xa0\x8f?\x97\xa2g\xca\x91\xectDt\x88V\xa8\xa6r+\x7f\xb1\xb7\x95\xb5\x82\xf4\xa2\xe2\xa6\x1e\xdf7\xed\x15\xc2\xca;\x87"
b"\xc1\xa7EV\xfd\xfa\xb2z)T\x9f\xa2\x90\xf0gv\x1a\xd0\x0f\x96Uu\xd1b;\xfc\xe7\xd3dlu\xb0\x90\xab\xfd\xb5$\x0f\xe0\x80vK\x95\xb0\x80\x9a\xf5\xd2\xfc\xf6\xf5!7/7\x1bp[C-?\x92O\x00\x120\xe4BHH\xe3R\xe5\x9a\xe9\xfe\x18\xd0\n\x0e.\x14)'\xe5f\xaa\xa6\xb6\x08\xc6B6\xfb\x82?\x9d\xda\xa2\xf0\x0b\xfb\xb7{\xf5d\xb4\xd7\x91\xfc\x9dF\x1f\xaa\xd3t\xb3\x8c5\x93o\x9e\xad\xd3}@\xb7\xd1\xcc\xc9?\xda\xc5bN\xe81o\x06\xf4\x98'\x1a\xe4\x13\x19eWS.Z\xea\xe3\xeaQ\xf2-6\x1a\x00\xb2\x19\x03\xcc\xac\xa6\xca?\xd7\xa7\xce-U\x9c\xa4% w\xbd\xabi\x86"
b"\xfd\x1a?\xd0\x8d\xfb\xa0{h\x85{3\rK\x85\xaa'\xfe&\x9c\xe0p\x94\x15\xa6\xdc}\x9d\x18\x08i\x84s\xf8\x0c{\xe3\xd1\xdb=\x11g\x8e\x95\xa1\xe2,p\xf3Q\xc6\xfd\xae\xb5\x90&3\xcf\xe8\xb3\x04\xe8z\xd5\x91\xfb9\rTj\xb0\xf5 A\xee\xf6\x0b\x92\x9f\xb3\xbed\xaa\x08e\xa9?\xe6\xfe\xc6\xa5\xda\xa3j\xde\xc7q\xbc\xaa\x00\x95\xbc\x11\xb6C\xe0\xfeg\xd7'\xe6\xaa\xa7\xa2\x9a\xdf\xc5\xf0\xe2Q\xb3\x89\x0fn\x98?\r\x84\x8eo\xe4\x1ek\xb0\xee\x04\xa4\xb6Z\x7f\x9f\xefi\x15c\x93\x1cvv\xfc)\xed*\xa5\x0fN65\xccO\x15wP'\x8a\xbb(\xdb\x15t\x03\x17\xbc\x9aT\x93\xd8\x05\xec\x82\xa6\x07"
b'\xe1\x9a\x7f\xcd\xec$\xaf\xf1\x8dE?bB\xc7\xfb\x80\xfa\x8a\x15\x18\xfc`\xa0C\x1e\xdd\xab\x19wL\x1046p~\x9b\xd1f\xde\xea\x01n\'\xfc=\xaa\xbdJ\xa2<y\xfcyU\xd2\x8e\xc5\x19\xe2;\x84\xd2\xad\xcc<\x96\xec:\xc7\xf0\x0cA\xa9\xc7\x1fM\x15\xeb\xb6\x92\x10\x98Fz\x8fi~\xb1\xcb\x9f\x1d\xd5R\x8f\xdela\xe1G5\xd24\xe7\xfa\xb9\xef B\xd5\xeen\xba\xe5\xe7E\xe5\x9b#\xd0\x18\xac\xf1\xbc"\x98\xff\xfaL\x8elG\xf3V\x1b\xd4\xbbu\xc2\xd7\x01V\xa1\x0e/C\xfaH\xad\x1cS\x10a\xff\xaa\x06\xe1=d!\xdc\x82\n9\xf2\xd0\x03\xb6\xfb]\xa3\xf2\xec\x9e8\x89U\x9fWr\xff\x87\xf6'
b'\x03\xf5j\x0fU\xfc\x83r\xce\x10\xf2.\x9f\x8f\\\xa6\xf4\x02\x00,\x04)\xdcR\x1d\xb95\xbe\x03\x144+\xb0\xa1\xa9\xd0\x10\xa9{\xad\x01)/\xd8f\xc5\xc3GZ\x0c\xb0D\xae\xfb\xbc\x1b0"h\xe6\xd1\xc1\x8a+\x99/\xdbY\xe7S\xf2\xc7"s\xec\x8d\xb6\xc9\x9b\x0f\xa31b\xe8\xc5\xef\x07\x12v\xf6[\xb44q\xe0j\x1d\xb0\x8a\x9dn\xeb:\xcb|\xfe\xd3\x8a\x00\xb7;\xdd\xe4\xd7\xaf\x9b\xdc\x95\xf1\x8bHx\xfe\xd3@\xbe\x92\x18\x0c[\x94\xea\'\xaf:\xe9\xcf\xd2\x0c@\xe4qH\x97\x07\x05D\xc7k\x07`\xe8\th\xcd\x02c\x1cG\xd8N\x8fL\xc26>s+\xfe\x03\x8b\xa8$ttu\xe3\xe2\x82\xb7\x8b\x08'
b'=\x8bq\x83>\xa9k\xc8\xc1\xc4\x1c\xc5\x9cs\x9b\xe8\xcdM\xa9v\xa5$q\x8fR\xe9\x12<\xb9e{\x1a\xe7J*\xa0\xc7@>\xc9\xaeg^m\xf2\xdd.\xae\xfa\x87\x80\x8a\x96\xd3?\x9f\x0b\x9f\xd3R\xb1\xf4@\x1f\xbc\x80\x15\xf9\xa2\x05\xc5]\xa4M\xbc\\\xd1\x85\x8c\xc6\xd2EVXW?s\x80_\x04\x89\x01\xa9\x8d\xbdJ_\x88Z\xe3\xe4\xd1pfC=\r\x84|\xfa\\(\xf3-\xe5\x9f9\xf9(R\xa6p\x90_ \x9e\xce\x1c\x97\xe1\xea\xb3/\x99\xb5X\xeeYN\\\xb7\x99H\r\x05\x0cS\xa3l\x9a\\:F\xe2\xe3\x07\xc5H\x1f\xd167pd\xe2\x9b\x85\xd1\xca|O\xe0\x0e\x8eV\x04O\x87\xd1\xd9V\x08'
b'\xba3B\x95\x07O\x82Z-\x7f\xfd}\xa0G\xd5N&\x90\xf0z\xdc\x8aW\xc5S\x82\xe9\xe1\x95\xfa3H=D\xf1\x0f\x17\x10t\x1dr\x08B\xf7.\x89\xac\xa5\\\xa9\xb5dR<\\3W\x96,6d.\x84\xbbT\x89l\xdf\x96\x04\xebc\xe4\xaa\x1a\x80W\xf1\xed\xfc\x19\x03`\x9b\xb5,6[\x96s;\xf2k\xe5\xbe\x047\x90l\x80\xa4\xc3.\x0b\xdci\x89\xad\xf0\xe3\x1bf\xa9\xcdI*< \x88\x12U\xb0N\x91+2\xe6Q\xffD\xe4&\xaf7\xb3\x06\xacd\xd8\xcaW\x08\xa7z\x8b3\x18\x9c\x81ieO\xb5\xeb\xfe\x7f\xee\xb9\xbei\xa9g\xe3\xdca\xa4*\xeb\xc3\x91\x14\xadCW\xa2\xb1l\xd8\xa8\x13\xc8\xfe'
b'R\xa6\xbd\x85\x82q4\xaau@X\xed;\x12\x0cQP\x0f\xcb\xf6P\x1bt\xb5)\x03p"Vh\xf5\xfe\x0c\xa3\x981\xcf\x8e\\1\xaeG\xf0P\xb9\xd6\xf5\xad$!\x10\xf1\xe0\x9d\xa7\xc1\xf0\xb3\xcdD\xf6\xc6sz\xc2\xa5i\x976.F\xf7?2\xd0n\xab>F\xa7f\xd1a\x84\xee\x8c9\x00@\xea\xdb\xe6\xc4w\x86\x15\xc0B\xd1\xc2\xe2\x0c7\xa0\xc7\xdb\xaeZ\xdbL\xeb<\xb1T\x97n\xd9\x89B\x12tf\x85\x08`*n\x12l\xea\xaesY\xa8\xee\xf9`\xca\xd9\xac\xb4\x11\xda\x8c\xb4\xad\xfd\x06:^\xf6^\xb9\xffY\x9b\xba\x9f\xb0M\xff\x07y\xc9\xaa\x85 \x1d^\x1eU,\x075#\xa9\xf9#4\x07Qe'
b'\xff\x1e\xd4!\xa9@\x04\xff\x1a\xa0\xacU\xaf\xbe\xa0T\xa2\xad\xfd\xa9\xb9\xe9hix\xc7\x18\x98E\xe9\xccD\xc1a\x05\xa2\xf8\x1e/\xa1\xb36EN\xe2\x15dN\x05\xb2\xe7\x84C\xaa\xa2\xd0\xec\xb4\xee6\x0eg\xfa|\xab}\xda\xcd\xfc\x9e\xd1\xf9V:e\xe8\xf6(\x95\xf4N?\n\xc3\xcd\x08-a\xb1\x11\x15K\xde\xc6h\xd7\x82\xa5\x9e\x86|lrL\xf3\xe6\xef\xd2\xeaR\x813S\xe3a8\x07K\x02;\x8c\x18:\xe3\xc9\xd6\x12\xe4\xc30\xa8E\x02O(J7\t\x816o\x8d\x00\xc5\xf1b\xc7iZ\x17\xbd~s\xb7}\xa6\x0e>o+j \xbe-I\x82\x89\x01\xe0\x88\x0b\xbe\xca\x7f\x07\x13VtDM\xf4\xcf'
b'\xc2Z\xc6o\x9dS_\xd1F\x1f*\xd5\x94 &\xd6_\x15\xa1\x855\x85\x98\x0c&R\xc4\nAL\xed\xb2|\xaa\xefH\xd7%\x90_\x99Cg\xbcc\xc8J/tJ\x96P\xf2y\xf3\xe82\xe3kl)h\xaf\xcf\xd6\xe0\x85\x0b~|\xac\xc8\xfb\xd1\x9a\xb1\\\x94\xc8\x81\n\x909\xe2,\xc6\xeaH\x9a\xac#\xc18"@\xf9\x10\xe7\tQ\x96\xf2#K\xa7\x86-\xfe\xa2\x94\x81\xf4+\xb4\xdd\x1e\xbb\x8c\x1d\x04\x81\xe6E\xda-\xac)\x9en\xdc\xff\x0e$\xf6E|#\x13\x175\x1fg\x9b\xda\xcd\xf1{\xda1G\x13\xf6>R\x1b\xd9<"U\xbe\xdf\x17\xdd\xbd\x88\xc4\rF\x95\xffJ\x82\xb36\xa8\x8bl\xfft\x84\xbc\x8a'
b"\xb2\x1cH\xd3O\x81\x06\xf3\xaf\x16'=[\xc4\x00d>\x80\xa7\xc12\xfc$\xf8-\x98\x17\xe9\xb83\x99%\xa2\xb6\x9260c?\xf0\xc4=\xb4\xa9\xc4jJ\x8e\xf3\x08\xd1\xc3\xdcP#\xc7\x08\xad\x8d\xdb[j\x8f\x9a<}\xae\xb6\xfe\x07\xc2\xbc\x0b:\x98\xae\x1b,\xb2\x9a6\xd1\x842_,^,D\x0bE&\xd3\xee\xae\xe9Os\xc5\x8b0c\xad\xef\x12\xd0\x8a\xcb\xcb\xf0\xffA\x1f\xcb\x80F\xb1\xd9\x94\x9e\xe9\x92,N\xcd'\xc4Y\x9f\x94\x1c\r\xe20\xdcS\x9d\\\xc1\x0b\x8c{l3\x18wM\xe6\x03\x8d\xf8\x86\xc4\x07;e!\x1e\x13\x92\x13A\xe7\xb9Ia\xef\x0e\xa6~\x86\xb4\xa6\xa1\x96\xa3fKm6W\xf3"
b's`X\x1ct\x17\x04\x8b\xd3\xd1\x89{\x98o\xe4x\xab\xa6\x9a3G\x06\xa3\xcc\x87Sc\xb3W\x0f\xd3g\xd6\xc4\xbc\xa5;\xae\x0e1s\xe9\xc5\xe8\xd9\xa88\xfd\x11\xe9\\TEW]\xfe9N9\xde\x96\x0eI\xe8\x0b\xaa\x0b\xdb\xe6\xa8w\xe1\x1dctI;H_-\xc0I\xbc\x89z\x80\x19\x80F\xec\xb1\xc47A\xdf\xf5\xc9\xb0\xcc\xc2a"5\x1e]\x16wS\x8f\x83gC\x87\xd6+&\xc4\x8eQ\x87!8\xda^\xe9\x95zO\xde\xc4\xad\xbe$\x18\x1b\xfb\xf7_\x82\xe7.\x9eP!@AG\x1c\xb6\xef6v\xb6\x0f\x7fi\xa9\x01\xfeW,3\x8a]y!\xa9&\x0f\xca\xe9l\x14==;0w7\xf6\x90\x98'Can you figure out the original message?GNU GENERAL PUBLIC LICENSE
                   Version 3, 29 June 2007Copyright (C) 2007 Free Software Foundation, Inc.https://fsf.org/Everyone is permitted to copy and distribute verbatim copies
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covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
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or that patent license was granted, prior to 28 March 2007.Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
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the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.Use with the GNU Affero General Public License.Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
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section 13, concerning interaction through a network will apply to the
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be similar in spirit to the present version, but may differ in detail to
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option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
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author or copyright holder as a result of your choosing to follow a
later version.Disclaimer of Warranty.THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.Interpretation of Sections 15 and 16.If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
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Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.END OF TERMS AND CONDITIONS

        How to Apply These Terms to Your New ProgramsIf you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year>  <name of author>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.Also add information on how to contact you by electronic and paper mail.If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:<program>  Copyright (C) <year>  <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.The hypothetical commandsshow w' andshow c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, seehttps://www.gnu.org/licenses/.The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please readhttps://www.gnu.org/licenses/why-not-lgpl.html.