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Use and/or possession of encrypting software may be considered a criminal action in certain countries. Ensure yourself that the use of this software is allowed in your country.



CLK 6 + SHELLCLK (Ingles)






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Encrypting algorithm: CLK®

Encrypting procedure: CLK®

Encrypting - Decrypting speed  (using a 2 GHz. prrocessor): 265 Kb./s. 

CLK® encrypts any kind of file and returns an unreadable file that can be decrypted with the same master key.

CLK® build or read a master key book (or database). Each master key contains up to 12 individual keys (10 text keys up to 64 characters, and 2 numeric keys). Using these keys, CLK® encrypts and decrypts, but having activated a Master Key from a Key Book beforehand.

The way CLK® encrypt and decrypt is totally innovative and the last keys close the encrypted file. As a result of it, it’s almost impossible decrypt that file without the original key. What’s more, CLK® can encrypt any file as many times as you want, increasing security.

A file can be used (verify key) that is independent from the key book and becomes key Nr. 23 of  CLK® algorithm. This function is optional. The software ask if you want to use 23rd key (verify key) before encrypting and decrypting.


 Previous Old Versions in :







CLK 3.0

16 bits (Console)


CLK 4.0

32 bits (Console)


CLK_Win 3.5

32 bits

English - Spanish

Shell_CLK 4.5

32 bits

English - Spanish

Shell_Java_CLK 1.0

32 bits Java




- The only way of breaking CLK©´s encrypted files, without Master Keys, is by brute force... It’s almost impossible!: The necessary number of combinations for breaking a CLK©´s encrypted file is amazingly high.

- Each Master Key encodes with 12 user customisable keys.

- Up to 20 customisable parameters in each key.

- In order to having best security, you can encrypt the data again, over an already coded file, any times you need.





Use and/or possession of encrypting software may be considered a criminal action in certain countries. Ensure yourself that the use of this software is allowed in your country. Moreover, by installing, operating, copying, distributing, or otherwise using CLK, you agree to the terms of this Shareware License Agreement. If you do not agree to the terms of this Agreement, DO NOT INSTALL CLK.






Conditioned on your honouring the terms of this Agreement, CIFFERLIB grants you a non-exclusive, non-transferable license (the "License") to install and use the current version of CIFFERLIB’s software product CIFFER LIBERTY KRIPTOR, including the accompanying user documentation and any later versions within the same major release series (collectively, "CLK"), for your personal, lawful, non-infringing use on up to three (3) personal computers or workstations in accordance with this Agreement. A separate License for each personal computer and workstation after the third or for which you do not personally use must be purchased.


TRIAL PERIOD. The License extends for a single Trial Period of 10 days following your first installation of CLK to permit you to evaluate CLK. The License will terminate automatically at the end of the Trial Period unless you register your copy of CLK first. You may not use CLK for more than one Trial Period.


LONG TERM LICENSE. If you register your copy of CLK with CIFFERLIB and pay the License Fee, the License will remain in effect perpetually unless terminated as provided below.



a.     You may provide copies of CLK to others for their trial use so long as you: provide exact, unmodified copies of CLK in the form of the self-installing .exe file or the ZIP file received from CIFFERLIB, including all accompanying files, this Agreement, and all copyright, trademark, proprietary, and other notices;

b.    do not charge or collect any monetary or other compensation for or in connection with CLK, apart from a modest reproduction or handling fee; and

c.     reference CIFFERLIB as the sole source of CLK and reference the official CLK website.


BACK-UP COPIES. You may make up to two exact, unmodified copies of CLK solely for your own back-up or archival use.



a.     sublicense, sell, lease, permit use of, give, lend, distribute, release, provide access to, or in any way transfer CLK or any copy or portion thereof, except for Trial Distribution as permitted above;

b.    use CLK to provide service bureau or time-sharing services to any other party;

c.     make any copies of CLK except as permitted herein;

d.    modify, enhance, or prepare derivative works based on CLK;

e.    decompile, disassemble, reverse engineer, analyse, or otherwise attempt to discover the source code of CLK;

f.       use or incorporate CLK or any portion thereof in any other product without the prior written permission of CIFFERLIB; or

g.    remove, alter, or obscure the copyright, trademark, proprietary, or other notices from CIFFERLIB or any of its screen displays.


SALE PRICE. CLK´s sale price is 100 Euros for one single licence an 400 Euros for 5 Licences, and its use is subjected to the registration of the buyer in CIFFERLIB´s database.


PROPIETARY RIGHTS. Title to, ownership of, and all copyrights and other intellectual property rights in CLK and all copies thereof shall remain solely in CIFFERLIB. CIFFERLIB is protected by Spanish copyright and other intellectual property laws and by international treaties. CIFFERLIB reserves to itself all rights not expressly granted in this Agreement. No Warranty. CLK and all related support and advice are provided "AS IS" and without warranty of any kind. CIFFERLIB disclaims all warranties, express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose.


OTHER DISCLAIMERS. CIFFERLIB does not warrant that CLK will meet your specific needs or requirements, nor that the operation of CLK will in all instances be uninterrupted or error-free. Because software is inherently complex and may not be completely free of errors, you must verify all results before relying on them.


EXCLUSION OF DAMAGES. CIFFERLIB shall not be liable for any direct, indirect, consequential, special, incidental, or other damages, including but not limited to damages for lost profits, interruption of business, lost or corrupted data or programs, system crashes, or diversion of system or other resources, arising out of or relating to this Agreement or the performance, quality, results, use of, or inability to use CLK or any support, advice, products, or services which are or should have been provided to you, even if CIFFERLIB has been advised of the possibility of such damages.


TECHNICAL PROTECTION. CLK may contain technical protections that restrict use to certain equipment, to a single personal computer or workstation, or to a certain time period, and may provide other restrictions, all of which shall be consistent with the License. CIFFERLIB shall not be liable for any damages incurred as a result of such technical protections or the failure of CLK to operate outside the scope of the License.


NO THIRD PARTY CLAIMS. CIFFERLIB shall not be liable for any claim asserted against you by any other party, including but not limited to claims for infringement of copyright or other intellectual property rights.


TIME TO FILE ACTION. No action arising under or relating to this Agreement, to CLK, or to any support, advice, products, or services which are or should have been provided to you, may be filed more than one year after the cause of action accrues.


APPLICABILITY. Some jurisdictions do not permit the exclusion or limitation of implied warranties or consequential damages, so some of the above exclusions or limitations may not apply to you.


TERMINATION FOR BREACH. CIFFERLIB may terminate the License with or without cause at any time immediately and without notice if you materially breach any term of this Agreement or infringe any of CIFFERLIB’s rights in CLK.


TERMINATION WITHOUT BREACH. CIFFERLIB may terminate the License upon ten days written notice if CIFFERLIB believes that your use of CLK may infringe any third party rights. If such termination occurs within 24 months of your first installation of CLK, CIFFERLIB will provide you a modified, non-infringing version of CLK and reinstate the License.

Duties on Termination. Immediately upon termination of the License, you must stop using CLK and destroy all copies of CLK within your possession, custody, or control.


NO ASSIGNMENT. You may not assign, sublicense, or otherwise transfer the License or any other rights arising under this Agreement. Any purported transfer in violation of this paragraph shall be void


ENFORCEMENT COST. You agree to reimburse CIFFERLIB for all costs, including reasonable attorney’s fees, incurred to enforce any of CIFFERLIB’s rights under this Agreement or in CLK or to defend any claims you assert unsuccessfully against CIFFERLIB.


SEVERABILITY. Any provision of this Agreement which is held to be unenforceable as written shall be enforced to the fullest extent permissible and shall not affect the validity of any other provision of this Agreement.


GOVERNING LAW AND FORUM. This Agreement shall be governed by and construed in accordance with the laws of Brazil. All disputes arising under this Agreement or in connection with CLK shall be resolved in the courts serving Brazil, including that actions for infringement of intellectual property rights.


ENTIRE AGREEMENT. This document states the complete, final, and exclusive agreement concerning your possession, operation, copying, distribution, and other use of CLK and supersedes all earlier oral or written agreements, proposals, marketing materials, representations, promises, and other communications between you and CIFFERLIB. The terms of this Agreement may only be amended, waived, or supplemented by a later writing signed by you and CIFFERLIB.


ADDITIONAL INFORMATION. If you have questions or desire additional information about CLK or CIFFERLIB’s software use or privacy policies, please contact [email protected]


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  CLK 4.0 CLK4 Ingles.html


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Download Manual CLK4 y SHELLCLK : CLK4 y

Download Manual CLK4 ENGLISH : CLK4

Download Manual SHELLCLK ENGLISH :

Download Manual SGC Y CLK6 : SGC y

Download CLK License :

Download SGA-EXEC for Windows and Lynux (At the end of web page ) :