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#1
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Workbook protected after some date dd/mm/yyyy
How can I prevent user to use my workbook after some date?
eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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#2
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Workbook protected after some date dd/mm/yyyy
There are various ways of doing what you want, none of which are very
secure. All such systems can be easily broken by anyone with knowledge of Excel. One way is to have a Workbook_Open macro that checks the current date. When the critical date is reached, the code within that macro can erase/delete the pertinent data within the file, then save the file. Post back if this fits what you need. Provide details about what you want erased/deleted. HTH Otto "Rodrigo Ferreira" wrote in message ... How can I prevent user to use my workbook after some date? eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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#3
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Workbook protected after some date dd/mm/yyyy
Thanks Otto,
I know that is easy to break this macro but I want to raise difficulties. This way that you wrote is good but if the user change the date of computer, he can use the workbook again. Any idea? -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... There are various ways of doing what you want, none of which are very secure. All such systems can be easily broken by anyone with knowledge of Excel. One way is to have a Workbook_Open macro that checks the current date. When the critical date is reached, the code within that macro can erase/delete the pertinent data within the file, then save the file. Post back if this fits what you need. Provide details about what you want erased/deleted. HTH Otto "Rodrigo Ferreira" wrote in message ... How can I prevent user to use my workbook after some date? eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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#4
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Workbook protected after some date dd/mm/yyyy
In other question, I would like to retrieve a date from a site that have a
atomic clock to make somthing like that. When open the workbook, it check the date on internet and if date 10/12/2006, the workbook dont open for user. But I dont know any site that have this date... -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... Well, you see the problem. One way would be to write the code to count the number of times the file has been opened and limit that number. The number of openings would be stored in a VeryHidden sheet (that way the sheet will not show up as being hidden if he does Format - Sheet - Unhide). But that would limit the user opening the file a number of times in one day. What ideas have you come up with? HTH Otto "Rodrigo Ferreira" wrote in message ... Thanks Otto, I know that is easy to break this macro but I want to raise difficulties. This way that you wrote is good but if the user change the date of computer, he can use the workbook again. Any idea? -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... There are various ways of doing what you want, none of which are very secure. All such systems can be easily broken by anyone with knowledge of Excel. One way is to have a Workbook_Open macro that checks the current date. When the critical date is reached, the code within that macro can erase/delete the pertinent data within the file, then save the file. Post back if this fits what you need. Provide details about what you want erased/deleted. HTH Otto "Rodrigo Ferreira" wrote in message ... How can I prevent user to use my workbook after some date? eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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#5
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Workbook protected after some date dd/mm/yyyy
Well, you see the problem. One way would be to write the code to count the
number of times the file has been opened and limit that number. The number of openings would be stored in a VeryHidden sheet (that way the sheet will not show up as being hidden if he does Format - Sheet - Unhide). But that would limit the user opening the file a number of times in one day. What ideas have you come up with? HTH Otto "Rodrigo Ferreira" wrote in message ... Thanks Otto, I know that is easy to break this macro but I want to raise difficulties. This way that you wrote is good but if the user change the date of computer, he can use the workbook again. Any idea? -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... There are various ways of doing what you want, none of which are very secure. All such systems can be easily broken by anyone with knowledge of Excel. One way is to have a Workbook_Open macro that checks the current date. When the critical date is reached, the code within that macro can erase/delete the pertinent data within the file, then save the file. Post back if this fits what you need. Provide details about what you want erased/deleted. HTH Otto "Rodrigo Ferreira" wrote in message ... How can I prevent user to use my workbook after some date? eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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#6
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Workbook protected after some date dd/mm/yyyy
That's way beyond my knowledge. Sorry. Otto
"Rodrigo Ferreira" wrote in message ... In other question, I would like to retrieve a date from a site that have a atomic clock to make somthing like that. When open the workbook, it check the date on internet and if date 10/12/2006, the workbook dont open for user. But I dont know any site that have this date... -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... Well, you see the problem. One way would be to write the code to count the number of times the file has been opened and limit that number. The number of openings would be stored in a VeryHidden sheet (that way the sheet will not show up as being hidden if he does Format - Sheet - Unhide). But that would limit the user opening the file a number of times in one day. What ideas have you come up with? HTH Otto "Rodrigo Ferreira" wrote in message ... Thanks Otto, I know that is easy to break this macro but I want to raise difficulties. This way that you wrote is good but if the user change the date of computer, he can use the workbook again. Any idea? -- Rodrigo Ferreira "Otto Moehrbach" escreveu na mensagem ... There are various ways of doing what you want, none of which are very secure. All such systems can be easily broken by anyone with knowledge of Excel. One way is to have a Workbook_Open macro that checks the current date. When the critical date is reached, the code within that macro can erase/delete the pertinent data within the file, then save the file. Post back if this fits what you need. Provide details about what you want erased/deleted. HTH Otto "Rodrigo Ferreira" wrote in message ... How can I prevent user to use my workbook after some date? eg. until 10/12/2006 the workbook works fine, after this date, the user cannot open the workbook -- Rodrigo Ferreira |
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