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1. # *****************************************************************************
2. #
3. # OC AUDIO ENCRYPTION
4. # Author: Ocedic
5. # Site: http://ocedic.wordpress.com/
6. # Version: 1.0
7. # Last Updated: 7/17/13
8. #
9. # Updates:
10. # 1.0  - First release
11. #
12. # *****************************************************************************
13.  
14. $imported = {} if $imported.nil?
15. $imported["OC-AudioEncryption"] = true
16.  
17. #==============================================================================
18. # ▼ Introduction
19. # =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
20. # This script will encrypt your audio files and decrypt them during play.
21. # Some important notes:
22. #
23. # * MP3s cannot be encrypted
24. # * This encryption is very rudimentary and easy to circumvent
25. #
26. # Essentially, this script is designed to protect your audio files from your
27. # regular Average Joe user. The fact is even if a 100% unbreakable
28. # encryption script existed, people could simply record the audio from your
29. # game and extract it that way.
30. #==============================================================================
31. # ▼ Instructions
32. # =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
33. # First, it's recommended that you change the default CIPHER_KEY and
34. # ENCRYPTED_FILE values in the configuration settings before you proceed.
35. #
36. # Run the script with ENCRYPT_AT_STARTUP set to true. This will create an
37. # encrypted version of all audio files in your music folder.
38. #
39. # Set ENCRYPT_AT_STARTUP to false and move your original audio files to a new
40. # location.
41. #==============================================================================
42. # ▼ Compatibility
43. # =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
44. # This script may not be compatible with scripts that change the way audio is
45. # played. If an incompatibility occurs, try placing this script above other
46. # scripts.
47. #==============================================================================
48. # ▼ Terms of Use
49. # =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
50. # Can be freely used and modified in non-commercial projects. Proper attribution
51. # must be given to Ocedic, and this header must be preserved.
52. # For commercial terms, see here: https://ocedic.wordpress.com/terms-of-use/
53. #==============================================================================
54.  
55. #==============================================================================
56. # ■ Configuration
57. #------------------------------------------------------------------------------
58. #  Change customizable settings here
59. #==============================================================================
60. module OC
61.   module ENCRYPT
62.    
63. #==============================================================================
64. # * Encrypt at Startup *
65. #------------------------------------------------------------------------------
66. #   This boolean value controls whether or not files are encrypted when the
67. #   game is booted. If true, the script will iterate through all audio files
68. #   in "Audio/BGM/" and encrypt them. When you have done this once, it's
69. #   recommended that you move the original audio files to a secure backup
70. #   directory and set this value to false.
71. #==============================================================================  
72.     ENCRYPT_AT_STARTUP = true
73.    
74. #==============================================================================
75. # * Cipher Key *
76. #------------------------------------------------------------------------------
77. #   This key will be used to encrypt and decrypt audio files. Note that
78. #   changing this string after you have encrypted your files will cause they to
79. #   be incorrectly decrypted. It's advised that you choose a string at the
80. #   beginning and stick with it!
81. #==============================================================================    
82.     CIPHER_KEY = "DONKEY"
83.    
84. #==============================================================================
85. # * Encrypted Extension *
86. #------------------------------------------------------------------------------
87. #   The extension of the encrypted audio files.
88. #------------------------------------------------------------------------------
89. # * Encrypted File *
90. #------------------------------------------------------------------------------
91. #   The name and path of unencrypted audio files. It's recommended that you
92. #   change this filepath to a more obtuse directory.
93. #==============================================================================
94.     ENCRYPTED_EXT = ".dog"
95.     ENCRYPTED_FILE = "System/RGSSAudio"
96.    
97.   end #ENCRYPT
98. end #OC
99.  
100. #==============================================================================
101. # ■ SceneManager
102. #==============================================================================
103. module SceneManager
104.  
105.   class << self
106.     alias oc_scene_manager_run_8pqe91 run
107.   end
108.   def self.run
109.     if OC::ENCRYPT::ENCRYPT_AT_STARTUP
110.       Dir.foreach("Audio/BGM/") do |item|
111.         next if item == "." || item == ".."
112.         next if item =~ /#{OC::ENCRYPT::ENCRYPTED_EXT}/
113.         item = "Audio/BGM/" + item
114.         Audio.encrypt(item)
115.       end
116.     end
117.     oc_scene_manager_run_8pqe91
118.   end
119.    
120. end
121.  
122. #==============================================================================
123. # ■ Audio
124. #==============================================================================
125. module Audio
126.  
127.   @fileswitch = false
128.  
129. #==============================================================================
130. # * New Method: Encrypt *
131. #==============================================================================
132.   def self.encrypt(filename)
133.     sourcefile = File.open(filename, "rb")
134.     content = sourcefile.readlines
135.     sourcefile.close
136.     encry_filename = Audio.strip_extension(filename)
137.     targetfile = File.open(encry_filename + OC::ENCRYPT::ENCRYPTED_EXT, "wb")
138.     for i in 0...content.size
139.       content[i] = OC::ENCRYPT::CIPHER_KEY + content[i]
140.     end
141.     Marshal.dump(content, targetfile)
142.     targetfile.close
143.   end
144.  
145. #==============================================================================
146. # * New Method: Decrypt *
147. #==============================================================================  
148.   def self.decrypt(filename)
149.     sourcefile = File.open(filename + OC::ENCRYPT::ENCRYPTED_EXT, "rb")
150.     content = Marshal.load(sourcefile)
151.     for i in 0...content.size
152.       value = content[i]
153.       content[i] = value[OC::ENCRYPT::CIPHER_KEY.length, content[i].size]
154.     end
155.     sourcefile.close
156.     begin
157.       targetfile = File.open(OC::ENCRYPT::ENCRYPTED_FILE, "wb")
158.       @fileswitch = false
159.     rescue
160.       targetfile = File.open(OC::ENCRYPT::ENCRYPTED_FILE + "1", "wb")
161.       @fileswitch = true
162.     end
163.     for i in 0...content.size
164.       targetfile.write(content[i])
165.     end
166.     targetfile.close
167.   end
168.  
169. #==============================================================================
170. # * New Method: Strip Extension *
171. #==============================================================================
172.   def self.strip_extension(filename)
173.     result = filename.chomp(File.extname(filename))
174.     return result
175.   end
176.  
177. #==============================================================================
178. # * New Method: Fileswitch *
179. #==============================================================================
180.   def self.fileswitch
181.     return @fileswitch
182.   end
183.  
184. end
185.  
186. #==============================================================================
187. # ■ RPG::BGM
188. #==============================================================================
189. class RPG::BGM < RPG::AudioFile
190.  
191. #==============================================================================
192. # * Overwrite: Play *
193. #==============================================================================
194.   def play(pos = 0)
195.     if @name.empty?
196.       Audio.bgm_stop
197.       @@last = RPG::BGM.new
198.     else
199.       filename = "Audio/BGM/" + @name
200.       if FileTest.exist?(filename + OC::ENCRYPT::ENCRYPTED_EXT)
201.         Audio.decrypt(filename)
202.         if !Audio.fileswitch
203.          Audio.bgm_play(OC::ENCRYPT::ENCRYPTED_FILE, @volume, @pitch, pos)
204.          begin
205.            File.delete(OC::ENCRYPT::ENCRYPTED_FILE + "1")
206.          rescue
207.          end
208.         else
209.          Audio.bgm_play(OC::ENCRYPT::ENCRYPTED_FILE + "1", @volume, @pitch, pos)
210.          begin
211.            File.delete(OC::ENCRYPT::ENCRYPTED_FILE)
212.          rescue
213.          end
214.         end
215.       else
216.         Audio.bgm_play(filename, @volume, @pitch, pos)
217.       end
218.       @@last = self.clone
219.     end
220.   end
221.  
222. end

출처 겸 사용법

http://ocedic.wordpress.com/scripts/utility-scripts/oc-audio-encryption/

http://www.rpgmakervxace.net/topic/16928-oc-audio-encryption/